Gas Pressure Changes Research Articles

TiN formation on Ti target by laser ablation method under different N2 gas pressure and laser scanning cycles: A wettability study

Titanium (Ti) and its alloys have vast applications in industry. However, surface modification technology should be performed to maintain Ti properties for its use in a variety of applications. Titanium nitride (TiN) is often used as a coating to improve surface properties due to its special characteristics. In this research, the laser ablation method is applied on Ti target in N2 atmosphere to make TiN structure using a fiber laser. The different N2 gas pressures and the number of laser scanning cycle effect was investigated on the formation of TiN structure. Different techniques were utilized to scrutinize samples. It was concluded that increasing the laser scanning cycle has a greater effect on the amount and quality of TiN structure compared to the change of N2 gas pressure. The aging effect on ablated surface wettability of samples was assessed by water contact angle (WCA) measurement. The samples illustrated superhydrophilic behavior immediately after laser processing and became hydrophobic over time. Due to the fact that the surface morphology didn't change with the aging effect, the wettability changing is due to the surface chemical composition by the oxidation process and adsorption of the airborne organic compounds of TiN surface by the effect of the long-term storage of ablated sample in the air that was studied by the X-ray photoelectron spectroscopy (XPS).

Stable Cycling of All‐Solid‐State Batteries with Sacrificial Cathode and Lithium‐Free Indium Layer

AbstractAll‐solid‐state batteries (ASSBs) comprising solidified cathodes, electrolytes, and Li–metal anodes have attracted notable attention as promising future batteries for electric vehicles owing to their exceptional stability and expectation of achieving high energy density. However, its permanent operation has been hindered by Li dendrite growth, chemo–mechanical degradation, and interfacial instability, leading to Li exhaustion, increased resistance, and internal short‐circuiting. Herein, for the first time, the authors report the effects of a lithium nitride (Li3N) sacrificial cathode on the cycling performance of ASSBs combined with a Li‐free In layer. Through in situ evolved gas and internal pressure change analyses of the cells, it is found that, as with the liquid electrolyte cell, the decomposed Li3N compensates for active Li consumed by side reactions in the cell. Moreover, it is demonstrated that the improved interparticle contact by volume expansion of In through additionally supplied Li as well as the interfacial stability at the anode side by the dendrite‐free In layer, are strongly responsible for the improved cyclability of the ASSBs. The findings reveal the effectiveness of the Li compensation approach for the stable cycling of ASSBs based on the secured interfacial stability at the anode side.

Study on the Technology of Enhancing Permeability by Millisecond Blasting in Sanyuan Coal Mine

To reduce gas disasters in low permeability and high-gas coal seams and improve gas predrainage efficiency, conventional deep-hole presplitting blasting permeability increasing technology was refined and perfected. The numerical calculation model of presplitting blasting was established by using ANSYS/LS-DYNA numerical simulation software. The damage degree of coal and rock blasting was quantitatively evaluated by using the value range of the damage variable D. According to the actual field test parameters of coal seam #3 in the Sanyuan coal mine, Dlim = 0.81–1.0 was the coal rock crushing area, Dlim = 0.19–0.81 was the coal rock crack area, and Dlim = 0–0.19 was the coal rock disturbance area. By comparing and analysing the damage distribution nephogram of coal and rock mass under the influence of different millisecond blasting time interval and the blasting effect of simulation model, the optimal layout parameters of multilayer through cracks were obtained theoretically. And, the determined parameters were tested on the working face of the 1312 transportation roadway in coal seam #3 of the Sanyuan coal mine. The permeability effect was compared and analysed through the analysis of the gas concentration, gas purity, and mixing volume before and after the implementation of deep-hole presplitting blasting antireflection technology, as well as the change of gas pressure, attenuation coefficient, permeability coefficient, and other parameters between blasting coal seams. The positive role of millisecond blasting in reducing pressure and increasing permeability in low permeability and high-gas coal seam were determined.

Molecular Origin of Wettability Alteration of Subsurface Porous Media upon Gas Pressure Variations

Upon extraction/injection of a large quantity of gas from/into a subsurface system in shale gas production or carbon sequestration, the gas pressure varies remarkably, which may significantly change the wettability of porous media involved. Mechanistic understanding of such changes is critical for designing and optimizing a related subsurface engineering process. Using molecular dynamics simulations, we have calculated the contact angle of a water droplet on various solid surfaces (kerogen, pyrophyllite, calcite, gibbsite, and montmorillonite) as a function of CO2 or CH4 gas pressure up to 200 atm at a temperature of 300 K. The calculation reveals a complex behavior of surface wettability alteration by gas pressure variation depending on surface chemistry and structure, and molecular interactions of fluid molecules with surfaces. As the CO2 gas pressure increases, a partially hydrophilic kerogen surface becomes highly hydrophobic, while a calcite surface becomes more hydrophilic. Considering kerogen and calcite being the major components of a shale formation, we postulate that the wettability alteration of a solid surface induced by a gas pressure change may play an important role in fluid flows in shale gas production and geological carbon sequestration.

Study of the influencing factors of the liquid CO2 phase change fracturing effect in coal seams.

To study the influence of different factors on the cracking effect of the liquid CO2 phase transition, the mechanics of coal rock crack extension based on liquid CO2 phase change blast loading were studied. Through the application of simulation software to analyze the influence of coal seam physical parameters (in situ stress, gas pressure, modulus of elasticity and strength of coal) and blasting parameters (fracturing pore size and peak pressure of detonation)on the effect of liquid CO2 phase change cracking, the simulation results showed that the cracking effect of liquid CO2 phase change was positively correlated with the changes in gas pressure, elastic modulus, fracture hole diameter and peak vent pressure, negatively correlated with the variation in situ stress and compressive strength, and nearly independent of the tensile strength. In addition, by using Gray correlation analysis to analyze the influence degree of six main factors on the cracking effect, the calculation results showed that the effect of blasting parameters was greater than that of physical parameters. The main controlling factor that affected the blasting effect was the peak pressure of blasting release. By conducting comparative engineering trials with different blasting parameters, the test results showed that the crack effect of the coal seam was positively correlated with the change in fracture hole diameter and peak venting pressure, which was consistent with the results obtained from the simulation. The experimental results and simulation results for the effective radius of coal seam fracturing were basically consistent, with the error between the two types of results falling below 10%. Therefore, the reliability of the blasting numerical model was verified. In summary, the research results provide theoretical guidance for applying and promoting liquid CO2 fracturing technology in coal mines.

Structures of hydrogen-induced cracks under different hydrogen concentrations for a high strength steel

Quantitative prediction of the hydrogen-induced crack initiation remains challenging, partially due to the difficulties in directly measuring the hydrogen gas pressure in the crack cavity. Through detailed cross-sectional observations, this study shows that the structure of the internal cracks beneath the surface blisters, i.e., the ratio of crack depth/length, can be significantly influenced by the hydrogen charging conditions. This is attributed to the change of hydrogen gas pressure in the crack cavity at different hydrogen contents, supported by the formation of stepwise cracks near the specimen surface as well as the hydrogen concentration measurements. The post-failure crack geometry is considered a useful indicator of the level of internal gas pressure to quantitatively assess the hydrogen-induced cracking sensitivity. The mechanisms of crack initiation and propagation at different hydrogen concentrations are discussed.

The instability criticality and safety factor of coal-gas outburst induced by shear failure based on limit analysis

Coal is a kind of natural pore-fracture dual medium, which determines the diffusion and seepage characteristics of gas inside under the stress conditions. In turn, the gas migration has an effect on the mechanical damage properties of coal and is closely related to the occurrence of coal-gas outburst. The occurrence of outburst is inevitably accompanied by the instantaneous displacement mutation of gas-bearing coal, which is difficult to explained by conventional plastic zone analysis. And the process from plastic failure to instability is still vague, which makes the instability critical of outburst difficult to determine. Therefore, aiming at the outburst in the working face, we put forward a progressive failure and outburst hypothesis model based on the limit analysis method of strength reduction theory. Then, the limit instability criterion of gas-bearing coal is modified, and the coal-gas outburst in the strength reduction process is simulated by using the cyclic calculation method of COMSOL software. It describes the characteristics of fluid–structure coupling and progressive failure instability of gas-bearing coal. Finally, we use the limit safety factor to describe the outburst criticality and the outburst risk. We find that the initial uncovering coal area, stress and gas pressure play an important role in controlling outburst, especially the coal stability is extremely sensitive to gas pressure changes under high stress. And based on these, the outburst prevention and control measures are put forward. The method has potential application value for the risk assessment and prevention of outburst on site.

Surface Discharge Mechanism with a Change of Gas Pressure in N2/O2 Mixed Gas for Insulation Design of SF6-Free High-Voltage Power Equipment

This paper presents the surface discharge characteristics with changes in gas pressure under a sphere-plane electrode with a Teflon dielectric in N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> mixed gas (80:20) and focuses on interpreting the surface discharge mechanism at both high pressure (0.3-0.6 MPa) and low pressure (0.1-0.2 MPa). The partial discharge and surface flashover voltages are measured under AC high voltage between 0.1 and 0.6 MPa of the N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> mixture gas. It is clearly observed that two surface discharge paths are revealed with the pressure change in the N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> mixed gas. In the high pressure case, the surface discharge path develops from the cathode-triple junction to a Teflon surface, and in the low pressure case, the path passes through the bulk gas at the sphere-electrode surface away from the triple junction and then advances to the Teflon surface. Surface discharge models for these two patterns are proposed based on surface discharge mechanisms including electron avalanche, photoionization, photoemission, electron attachment, electron detachment, and dielectric charging.

Applicability of polymer and composite inner linings in containers for borehole disposal of sealed radioactive sources − A simulation-based study of radiation effects

Borehole disposal concept is a widely applicable, standardized solution for disposal of sealed radioactive sources, developed jointly by IAEA and South African NECSA with the goal of offering a safe and secure disposal solution, based on readily accessible gear and materials. Previous research has considered use of polymer and composite materials in place of standard materials such as concrete and steel in various phases of radioactive waste management. Use of alternatives such as these can be advantageous in environments that have adverse effects on commonly utilized materials, in terms of chemical aggressiveness or radiation damage. The present study examines the suitability of polymers and polymer-based composites for potential use as inner lining in borehole disposal containers, from the perspective of radiation effects. Investigated materials, not envisioned by the original concept, include HDPE, PS, PEEK, PEI and PSU, as well as composite materials having one of these polymers as a matrix reinforced by boron fibers. Such containers would be simpler and safer to manipulate, owing to the lower mass of these materials. Applicability of the investigated materials is analyzed by using Monte Carlo simulations to determine the energy deposited or absorbed dose in various container linings. These results are then used for calculating the overpressure within the container, caused by radiation-induced (i.e. radiolytic) gas generation, as well as the changes in polymer molecular weights which may influence their mechanical characteristics. Radioactive sources used in simulation models, positioned inside disposal containers of known standard dimensions, include Co-60 and Cs-137 gamma sources and the americium-beryllium (AmBe) neutron source. The obtained results indicate that the examined materials do not produce any significant increase in container gas pressure or experience notable changes in molecular weights, and are hence a viable option for linings in borehole disposal containers.

Integration of discrete fracture reconstruction and dual porosity/dual permeability models for gas production analysis in a deformable fractured shale reservoir

Permeability of gas shale in Changning region is exceptionally low and ranges from 0.76 × 10−4 to 1.56 × 10−4 mD, and fracturing stimulation measures can produce high diversion channels. Therefore, the technology of multi-stage fractured horizontal wells (MFHWs) is essential for commercial exploitations. Microseismic hydraulic fracture mapping (MSM) can effectively provide visual information (spatial position, hydraulic fracture geometry, and distribution complexity) and has now been currently used to evaluate and optimize the fracturing operations and well completions.The shale gas pressure changes with production time after injection and stimulation treatments, which can result in the dynamic evolution and redistribution for in-situ stresses. This study established a poroelastic porosity and permeability model for triple-continuum incorporating desorption-induced deformation, Knudsen diffusion, and viscous flow. The discrete fracture network (DFN) was interpreted by the robust occurrence calculation method based on the Random Sample Consensus (RANSAC) algorithm. This dual porosity/dual permeability (DPDP) model was more accurate than the other four classical models that were based on the single porosity and permeability model. The porosity and permeability for matrix and natural fractures decreased exponentially with production time, and the reduction ranges were less than 1% in the whole production, and the variation ranges for hydraulic fractures can reach nearly 5%. Meanwhile, the induced deformations under the same in situ stresses were maximum for the hydraulic fractures, and minimum for the inorganic pores, while intermediate for the natural fractures. Furthermore, this study compared the equilibrium desorption mechanism (EDM) with the non-equilibrium desorption/adsorption mechanism (NEDAM) on cumulative production. It was discovered that NEDAM exposed the delayed effect for the shale gas, and the calculated production for NEDAM was smaller and more reasonable than EDM. This study provided a workflow from fracture interpretation to reservoir evaluation by an effective geophysical method.

Light-induced pressure anisotropy and temperature change in atomic gases

Pressure anisotropy and radiative temperature change are investigated in a one-component atomic gas in the field of resonant laser radiation. This is a continuation of the work in Chermyaninov and Chernyak [“Light-induced phenomena in one-component gas: Pressure anisotropy and change of gas temperature,” Phys. Fluids 32, 017105 (2020)]. An atomic gas located between infinite parallel plates is considered. A traveling electromagnetic wave propagates along the plates, whose frequency is close to that of electron transitions in gas atoms from a ground state to an excited one. Resonant optical radiation stimulates gas pressure anisotropy and a change in its temperature. General expressions are obtained for the longitudinal and transverse changes in gas pressure, as well as for the optical change in its temperature. The kinetic coefficients that determine the magnitude of these phenomena are calculated for large Knudsen numbers (Kn). The results for atomic and molecular gases are compared.

Study on Gas Emission Characteristics in Lower Stress-relief Coal Seam for Improving Mining Safety of Extremely-close Upper Seam: Implementation of Coupled Permeability Model

In two extremely close coal seams, when the upper coal seam being first mined, large amount of gas normally emits into the mining area from lower stress-relief seam. This is a significant safety issue which may lead to gas-related incidents. In this paper, a coupled permeability model was developed. Then COMSOL Multiphysics numerical simulation was conducted to study multi-factor coupling gas emission flow characteristics. Furthermore, effects of coal stress, gas pressure and initial coal permeability on gas pressure change in lower stress-relief coal seam was analysed. The numerical model established is based on a real case of Ji15 coal seam and Ji16-17 coal seam in Pingdingshan No. 8 coalmine, China. Results show that after upper seam (Ji15 coal seam) being mined, the closer to bottom of working face, the lower the gas pressure because of increasing gas emission performance. As the distance from floor of working face increases, gas pressure becomes closer to its original value. Meanwhile, due to gas emission, gas pressure drop in lower stress-relief coal seam (Ji16-17 coal seam) is symmetrical from the middle of mining face to two ends. Along the parallel direction of mining face, gas pressure curve is approximately in “W”-shape, with gas pressure at both ends tends to be original. From two working face ends to the middle, gas pressure first decreases before increasing, with a maximum decrease of 9.36%. Furthermore, coal stress, gas pressure and initial coal permeability are all positively correlated with gas pressure decrease. Significance of initial coal permeability’s effect is higher than the other two factors. Above results could provide references on drainage borehole design for related scholars and on-site engineers, which is of significance for improving mining safety.

Диссоциативная рекомбинация в послесвечении барьерного разряда в неоне низкого давления. Заселение атомов конфигурации 2p-=SUP=-5-=/SUP=-3d

The decaying neon plasma produced by the dielectric barrier discharge (DBD) in a cylindrical tube at a pressure of 0.1–40 Torr has been spectroscopically investigated to analyze the dissociative recombination (DR) of molecular ions with electrons as a mechanism for the formation of excited atoms. It is shown that, at the electron density in the afterglow less than 5•1010 cm-3 the DR is the dominant source of population of 3d levels at pressures PNe ≥ 0.6 Torr. At lower pressures, the optical properties of the decaying plasma are formed to a greater extent by the collisional-radiative recombination of Ne+ ions. A significant variation of the relative intensities of the 3d -&gt; 3p transition lines in the afterglow with a change in gas pressure was found, reflecting the effect of inelastic collisions on the formation of the spectrum of decaying plasma in the near infrared region. From measurements carried out at a pressure of 0.6 Torr, the relative values of the partial DR coefficients for the 3dj levels of the neon atom were found. Comparison of these data with measurements in the near ultraviolet region, containing the lines of 4p -&gt; 3s transitions, indicates the need to take into account the cascade 4p -&gt; 3d transitions to correctly solve the problem of the final products of dissociative recombination.

Experimental investigations of CO2 seepage behaviorin naturally fractured coal under hydro-thermal-mechanical conditions

Gas-flow in coal or rock is hypersensitive to the changes of temperature, confin?ing pressure and gas pressure. This paper implemented a series of experiments to observe the seepage behavior, especially the permeability evolution of CO2 in naturally fractured coal sample under coupled hydro-thermal-mechanical conditions. The experimental results show that coal permeability increases exponentially with the increasing gas pressure, and tends to be linear when the confining pressure is high. Coal permeability decreases exponentially with the increasing confining pressure. Coal permeability decreases with the increasing temperature generally, but it may bounce up when the temperature rises to high. The results provide reference for the projects of coal gas extraction and carbon dioxide geological sequestration.

Verification of Rapid Determination of Coal Seam Permeability Coefficient Based on COMSOL

To verify the accuracy of the calculation method based on the indentation-pressure drop method to quickly determine the coal permeability coefficient, this paper simulated the gas pressure change curve of the borehole based on the COMSOL numerical simulation software. The pressure change curve obtained by setting different air permeability coefficients in the simulation software, combined with the rapid determination of the coal permeability coefficient calculation method to calculate the coal permeability coefficient, and the error between the simulated value and the calculated value is compared. The results show that the relative error between the simulated value and the calculated value is -23%~+45%, and the error between the calculated result and the simulated parameter is small, which verifies that the method of quickly determining the coal permeability coefficient based on the indentation-pressure drop method is correct and feasible. The simulation results show that the calculation results of the pressure curve obtained by the short-term simulation and the long-term simulation are basically the same. Therefore, the short-term measurement results can also be used to calculate the coal seam permeability coefficient. The rapid determination of the coal seam permeability coefficient is theoretically feasible.

A Theoretical Study of the Possibility of Obtaining the Radioisotope 13N for Medical Applications Using Dense Plasma Focus Device

The aim of this research is to study the possibility of obtaining the short-lived radioisotope 13N by colliding with a deuterium ion beam emitted by an NX2 dense plasma focus device with a graphite target, as a technique alternative to the traditional technique for getting short-lived radioisotope (SLR) accelerators. Lee code was used to study the properties of the plasma pinch, which is the source of deuterium ion beams. Then, a function of distributing the beam energy and stopping power was found within the graphite using SRIM program. The reaction cross-section was also found from an EXFOR database and the radiative yield of the reaction was calculated. The radioactivity of 13N was calculated and found to be equal to A = 4.14×103 Bq. The effect of the change in deuterium gas pressure on the radioactivity was studied and it was found that the best value for the pressure is 3 Torr, where the number of deuterium ions is the greatest amounting to 3.12×1011 ions and thus the radioactivity increased to 5.616 ×103 Bq. The effects of repetition rate of the studied dense plasma focus device and the exposure time of the graphite target to deuterium ions were studied. The radioactivity was calculated at repetition rates (1,5,10,16 ) Hz and exposure times (30,60,600) sec., where we noticed an increase in the value of radioactivity at a repetition rate of 16 Hz and an exposure time of 600 sec., reaching to 28791 × 103 Bq. To obtain a radioactivity value for 13N suitable for use in PET technique, the radioactivity value was calculated at high repetition rates (50,100,500) Hz and exposure times (30,60,600) sec. We obtained the value of radioactivity 527 ×106 Bq at a repetition rate of 500 Hz and an exposure time of 300 sec. and this value is suitable for use in PET technique. However, there are technical difficulties in the studied dense plasma focus device to obtain a high repetition rate of this value. The radioactivity of 13N was calculated at very high times of exposure of the graphite target to deuterium ions (1000, 1500, 2000, 2500, 3000) sec. at the repetition rates of the device studied. The highest radioactivity value obtained was 55.79 ×106 Bq at an exposure time of 3000 sec. and this value is less than the required value for the required use in PET technique. Keywords: Dense plasma focus device NX2, Lee code, Radioactivity.

Analysis of Thermo-Hydro-Mechanical Coupling of Coal and Gas with Absorption/Desorption Thermal Effect

Coal adsorption/desorption gas can cause temperature changes. Moreover, the pressure difference between the high gas pressure area and the low gas pressure area in the coal may affect the coal adsorption/desorption gas thermal effect. To study the effect of adsorption/desorption thermal effect on the evolution law of coal and gas outburst precursor information under different pressure differences, the adsorption/desorption thermal effect experiments were carried out. And the thermo-hydro-mechanical coupling model was established, which reflects the interaction between coal and gas. Under the action of ground stress, pore pressure, adsorption expansion stress, and thermal expansion stress, the model includes the dynamic evolution of coal porosity and permeability, gas adsorption-desorption-diffusion-seepage, and energy accumulation and dissipation. Using the coupling model, the mechanism of adsorption/desorption thermal effect on the evolution of outburst precursor information and the mutual coupling relation between coal and gas is analyzed. The experimental results show that the relation between pressure difference and coal sample temperature variation is linear, and the pressure difference has a quadratic parabolic relation with the temperature accumulation of coal sample. As the pressure difference increases, the temperature variation of the coal sample gradually increases, but the temperature accumulation gradually decreases. Numerical simulation results show that as the pressure difference increases, the changes in coal temperature and gas pressure gradually decrease, and the thermal expansion strain caused by the adsorption/desorption thermal effect decreases, and the permeability increases. Comparing the calculation results with or without the adsorption/desorption thermal effect, the volumetric strain, temperature, and permeability of the coal have significant changes when the adsorption/desorption thermal effect is considered, and the gas drainage volume increases as the pressure difference increases. The effect of thermal expansion strain caused by adsorption/desorption thermal effect on gas seepage is greater than the effect of temperature change on gas seepage.

Effects of donor density on power-law response in tin dioxide gas sensors

We investigated the power-law responses in two types of tin dioxide (SnO2) films: one made from nanosized grains and another from from very large grains, both under dry air. Experimental results revealed a significant dependence between the sensitivity and the SnO2 grain size. We therefore propose, that the gas sensor sensitivity is not only determined by oxygen chemisorption, but also by changes in the density of oxygen vacancies in response to changes in the ambient gas pressure. Band bendings and adsorbate coverages for different oxygen pressures were derived resorting to the electroneutrality condition, including changes in the concentration of oxygen vacancies within the grains due to the exposure to different oxygen pressure. The consequences for the film conductivity and its power-law response were analyzed and compared with experimental results.

Constitutive modeling for undrained shear behavior of gassy sand considering energy dissipation at the mesoscopic level

The gas phase in the gassy sand is in the form of occluded bubbles which are surrounded by water within the void space. Due to the high compressibility of the gas bubbles, it has a significant impact on the shear strength, volume change and other engineering properties of gassy sand. Based on the thermodynamic theory of granular matter, combined with the dilatancy equation considering the state parameter and the relationship between pore gas pressure and pore gas volume change, a thermodynamic constitutive model is developed to describe the undrained shear behavior of gassy sand. The model considers the dissipation at the mesoscopic level, and the concept of granular temperature is introduced to describe the irreversible deformation of gassy sand. The relationship between the dissipation mechanism of gassy sand and the macroscopic mechanical behavior is established through the migration coefficients and energy density functions. The ability of the model to describe the undrained shear behavior of gassy sand is verified by the numerical simulation of the undrained triaxial shear tests of the remolded Ottawa sand with different degrees of saturation.

Effect of sputtering gas pressure on the performance of WO3 thin films electrochromic device

WO3 films were deposited on transparent conductive indium tin oxide (ITO) glass under different working pressure conditions via radio frequency magnetron sputtering technology, and their electrochromic properties were studied. The morphology, electrochromic cyclic voltammetry characteristics, and light modulation properties of the films were studied using a scanning electron microscope, an electrochemical test station, and an ultraviolet-visible spectrophotometer. The transmittance modulation amplitude increases first and then decreases with the change of sputtering gas pressure, reaching the maximum transmittance modulation amplitude at 1.0 Pa. For the response time, the increase in sputtering gas pressure also shows a change of shortening and then increasing. By comprehensively considering the stability of the transmittance modulation amplitude and the stability of the response time, it can be found that as the sputtering gas pressure increases, the stability of the device’s electrochromic performance increases first and then decreases. Therefore, the sputtering gas pressure needs to be maintained in a relatively reasonable range. When it is too high or too low, it is not conducive to achieving good stability.