Slurry Erosion Research Articles

DEVELOPMENT AND PERFORMANCE ANALYSIS OF Ni–15Cr2O3–5TiO2 AND Ni–15Al2O3–5TiO2 HVOF COATINGS IN EROSIVE FLY ASH SLURRY

This study is focused on improving the mechanical properties and slurry erosion resistance of traditional Ni–20Al2O3 and Ni–20Cr2O3 thermal spray coatings by reducing the 5% of Al2O3 and Cr2O3, respectively, and addition of 5% TiO2 feedstock in both coatings. Thermal sprayed powders were thermally sprayed on SS-420 substrates with high-velocity oxy-fuel (HVOF) method. A lab-scale pot tester was used to conduct the wear testing at low rotating speeds of 750, 1000, 1250, and 1500 rpm. To create severe accelerated conditions, a high mass flux (35–50 wt.%) of fly ash particles was used. Multi-sized fly ash slurries ranging from [Formula: see text][Formula: see text][Formula: see text]m to 250[Formula: see text][Formula: see text]m were used during the experiments to evaluate the impact of particle size fraction on the erosion over a 30–120 min time-period. Coatings’ surface characterization was done to examine more about their composition. According to the findings, the addition of 5% TiO2 powder to both Ni–15%Al2O3 and Ni–15%Cr2O3 coatings significantly improved their wear resistance of SS-420. This occurred because of the enhancement of hardness as well as brittleness by 5% TiO2 in matrix of Ni–15%Cr2O3 and Ni–15%Al2O3 coatings. Moreover, TiO2 particles aid in strengthening of Cr2O3 and Al2O3 reinforcements and the binding with matrix. Also, the results showed that Ni–15Cr2O3–5TiO2 coating showed superior wear resistance compared to Ni–15Al2O3–5TiO2 coating.

Surface Damage Analysis on the Application of Abrasion and Slurry Erosion in Targeted Steels Using an Erosion Test Rig

The research focuses on slurry abrasion and erosion of martensitic steels used in the mining and agricultural industries. A traditionally constructed slurry pot tester with corundum abrasives in slurry form was used for wear characterisation. Wear testing was performed on each specimen for 180 h. Every 20 h, pauses were taken to characterise the specimen size, weight, hardness, and surface roughness. The worn zone’s damage progression was studied using optical microscopy. As the test period rose, the mass loss due to the wear, which was governed by the impact angle of the slurry flow, followed a linear pattern. The impact of specimen orientation on the wear rate was more pronounced than that of abrasive flow velocity. High-speed video recordings highlighted the varied contact conditions that caused the wear mechanism to shift from abrasion to slurry erosion. Slurry abrasion was seen at the bottom of the specimen as a result of pure sliding conditions, while pitting was observed at the top of the specimen as a result of fatigue from particle impact. Studies of 3D surfaces demonstrated a decrease in wear rate while transitioning from the abraded zone, which witnessed polishing and minor hardness, to the pitting zone. The wear performance of the materials was rated, with tempered martensitic steel coming out on top.

Corrosion-erosion behavior and mechanism of Cu[sbnd]Mo co-doped CoCrFeNi high-entropy alloy coating prepared by directed energy deposition

Developing cost-effective and high-performance high-entropy alloy (HEA) coatings on demand is imperative. This study designed a class of HEAs on-demand by synergistic doping of Cu and Mo elements based on the first-principles and multi-principal alloy design concept. A CoCrFeNiCu0.25Mo0.75 HEA coating with outstanding corrosion and slurry erosion wear performances was fabricated on the duplex stainless steel using the directed energy deposition technique. The corrosion mechanism of the HEA coating in 3.5 % NaCl and 0.5 M H2SO4 solutions and the slurry erosion wear mechanism under a slurry concentration of 5 wt% were analyzed in combination with the density functional theory. The results indicate that the SQS crystal model is a better predictor of phases and properties of HEA than the VCA model. The HEA coating is a cellular structure that consists mainly of a face-centered cubic phase structure and contains a small amount of homogeneous sigma nanocrystalline secondary phase precipitation. Meanwhile, the passive film of the HEA coating is mainly composed of metal oxides and hydroxides. Cu is not oxidized during the corrosion process and always exists in the metallic form, which serves as a barrier layer to prevent the transfer of point defects. Mo with a larger atomic size can induce lattice distortion, enhance the coating strength and hardness, and reduce the density of point defects. Further, the slurry erosion wear rate of the HEA coating is lower at a 30° impingement angle than 90° for brittle erosion mode. At the 30° impingement angle, micro-cutting and ploughing are the main wear mechanisms of the HEA coating, while at the 90° impingement angle, micro-indents and craters are the main wear mechanisms. In addition, the corrosion and slurry erosion wear performances of CoCrFeNiCu0.25Mo0.75 HEA coating are better than the most reported once-formed HEAs.

Behavior and mechanism of slurry erosion to grooved surface at different angles

The impingement angle has a significant influence on the slurry erosion behavior. There is limited knowledge of the effect of the impingement angle on the erosion of the micro-structured surface. Slurry erosion experiments were carried out on the V-shape grooved surface at four different impingement angles (30°, 45°, 60°, and 90°) in the slurry with 5.1 m s−1 velocity and 5 wt% sand content. Mass loss measurement, surface micro-morphology, roughness test, and nanoindentation revealed the relationship between microstructure damage and impingement angle. The effects of the area and impingement angle on erosion were discussed. The results show that the slurry erosion of the V-shape grooved surface displays a similar trend with the impingement angle to the smooth surface but with a relatively low erosion degree. The slurry erosion is alleviated to the most at the impingement angle of 45°. The ratio of the top surface to the grooved surface and the actual impingement angle to the grooved surface play essential roles in reducing the slurry erosions. This work can help to design the surface microstructure and set the relative position of the impingent flow to the target material surface.

Computational investigation of erosion wear in the eco-friendly disposal of the fly ash through 90° horizontal bend of different radius ratios

Abstract In the present study, slurry erosion wear was evaluated in 90° horizontal pipe bends of various radius ratios (R/r = 2–10) through a commercial CFD code ANSYS FLUENT. For the suspension of fly ash-water, Euler–Lagrange and two way-coupling methods were employed to predict the slurry erosion wear. The flow through the horizontal bend pipe was simulated using a Standard k–ε turbulence modelling. The computational results were validated with the experimental result of the available literature. Fly ash was taken as the dispersed phase of the solid-liquid combination however water was used as the liquid phase. The fly ash particles size was taken as 150 µm. Various affecting factors, such as velocity (4–10 m/s) and solid concentration (2.5 and 7.5% by volume) of the fly ash, were also studied in this investigation. The erosion rate was maximum in the case of R/r = 4 and minimum for R/r = 10 at all velocities and concentrations. It was also found that the erosion rate increases with the increase in solid concentration and velocity.

Slurry Erosion Behavior of Thermally Sprayed Nano YSZ Reinforced WC-10Co-4Cr Ceramic Nanocomposite Coatings

The presence of nanoparticles in the conventional coatings improves their strength by increasing the microhardness and reducing the porosity. The nanocomposite coatings play a significant role in increasing the erosion resistance. The purpose of this study is to observe the erosion behavior of nano yttria stabilized zirconia (Y2O3/ZrO2; YSZ) reinforced WC-10Co-4Cr ceramic nanocomposite coatings. The WC-10Co-4Cr conventional coating powder, and 95% and 90% of WC-10Co-4Cr reinforced with 5% and 10% of nano YSZ powders, coated on CA6NM steel using a high-velocity oxygen fuel (HVOF) spraying process. The Taguchi method using an L9 orthogonal array was applied for experimental design. Erosion test rig was used to perform erosion experiments at various levels of selected parameters. The results of erosion experiments and analysis of variance (ANOVA) for the conventional and nanocomposite coatings revealed that impact velocity performs a significant role in the material loss, followed by slurry concentration, average particle size, and impingement angle. Scanning electron microscopy (SEM) analysis of eroded samples revealed that cracks, protuberances, deep craters, spalling, ploughing, micropores, microcutting, lip formation, chip formation and microcracks are mainly responsible for the erosion of substrate material and different types of coatings. Inclusion of nanoparticles of YSZ into the WC-10Co-4Cr microparticles increased the microhardness and decreased the porosity of the nanocomposite coatings. Thus, the silt particles cannot penetrate more deeply into the metal surface and provided high resistance to erosion. It was observed that 95% (WC-10Co-4Cr) + 5% YSZ and 90% (WC-10Co-4Cr) + 10% YSZ ceramic nanocomposite coatings exhibits higher resistance to erosion in comparison with WC-10Co-4Cr coating and substrate material, due to better mechanical properties.

Investigation of Wear Property and Strengthening Mechanism of Hot-Rolled Medium Manganese Steel on Condition of Slurry Erosion Wear

Abstract In order to further expand the application field of medium manganese steel, its wear property and strengthening mechanism under the slurry erosion wear were studied in this paper. At different erosion angles and velocities, the erosion-wear resistance of medium manganese steel was superior to the martensitic wear-resistant steel. The formation of wear-hardened layer caused by the work-hardening effect was the fundamental reason for wear strengthening. The depth of the wear-hardening layer was nearly 400 µm and surface hardness was above 495 HV. The wear strengthening mechanism was attributed to the combined strengthening, including the martensitic transformation, twin, and dislocation strengthening. The maximum value of erosion wear-rate appeared at 60 deg erosion angle and the minimum value occurred at 90 deg erosion angle. The erosion-wear damage included three aspects of the micro-cutting, erosion peeling caused by the plastic deformation, and local gouging abrasion. The change of erosion angle led to the change of normal and tangential force components of erosion particles on the wear surface, which changed the main wear mechanism of erosion wear. With the change of erosion angle from low to high, the main wear mechanism gradually changed from the micro-cutting wear to the erosion peeling wear and local gouging abrasion.

Preparation of Cemented Carbide and Study of Copper-Accelerated Salt Spray Corrosion and Erosion Behavior.

(1) Mud pulser carbide rotors, as a core component of ground communication in crude oil exploration, are often subjected to mud erosion and acid corrosion, resulting in pitting pits on the surface, which affects the accuracy. The purpose of this study was to investigate the acid corrosion and erosion behavior of cemented carbide materials and provide a reference for the wider application of cemented carbide materials in the petrochemical industry. (2) Experimental samples of tungsten–cobalt carbide were sintered at a low pressure by powder metallurgy. The petrochemical application environment was simulated by accelerated salt spray corrosion and solid slurry erosion with the aid of acidic copper, and the experimental phenomena were analyzed by SEM (scanning electron microscope), EDS (Energy Dispersive Spectroscopy), and XRD (X-ray diffraction). (3) The experimental results show that the coercivity of the pitted cobalt-cemented tungsten carbide prepared in this study was 17.89 KA/m, and the magnetic saturation strength was 14.42 G·cm3/g. The corrosion rate was the fastest during the acidic copper acceleration experiments from 4 h to 16 h, and the corrosion products of WCo3 and Co3O4 were generated on the corrosion surface. The maximum erosion rate of 0.00104 in the erosion experiment corresponds to a corrosion sample with a corrosion time of 36 h. (4) Therefore, the coercive magnetic force and magnetic saturation strength could be derived from the prepared carbide hard phase grains and carbon content in the appropriate range. The corrosion product in the corrosion process slowed the corrosion rate, and a large amount of cobalt and a small amount of tungsten was lost by oxidation during the corrosion process. The corrosion time had the greatest effect on the erosion performance of the carbide, and the long corrosion time led to surface sparseness, which reduced the erosion resistance.

Evaluating the slurry erosion rates of uniaxially stressed stainless steel 304

Erosion enormously affects the chemical processing industry and the oil and gas industry. Particulates in the stream of flow cause material loss to the tune of millions of dollars. Parameters that are known to affect erosion include particle size, impact angle and velocity. However, very few have studied the effects of the stress state of the target on erosion rates. This paper studies the erosion rates of stainless steel 304 under the effects of a uniaxial stress from an external tensile load. Loads up to 70% of yield strength (YS) were applied and erosion rates were determined from the weight loss of the samples. The Taguchi method was used to analyze the influence of each parameter on the erosion rates. Results show that velocity and particle size enormously affect erosion rates followed by angle of impact. Stress state of the target showed no significant effects on erosion rates.

Microstructure and properties of Ta-reinforced cobalt based composite coatings processed by direct laser deposition

Circulating water pump is an important component in coastal nuclear power plant, and is prone to suffering erosion and corrosion from the sea water. In the present study, Ta-reinforced cobalt-based composite coatings were prepared on the surface of a martensitic stainless steel by direct laser deposition technology. The effect of Ta on the phase composition, microstructure, micro-hardness, residual stress, corrosion resistance and erosion performance of the cobalt-based composite coatings was systematically investigated. The results indicated that the addition of Ta can lead to the formation of dispersed TaC ceramic particles in the coatings. In the meantime, TaC particles with flaky shape greatly changed the morphology of reticular eutectic carbides and residual stress distribution in the coatings. The potentiodynamic polarization testing and electrochemical impedance spectroscopy (EIS) measurements showed that the addition of Ta had no prominent influence on the corrosion resistance of cobalt-based coatings. Generally speaking, the coating with 30 wt% Ta addition exhibited the best comprehensive performance considering micro-hardness measurement, residual stress value, potentiodynamic polarization testing, and slurry erosion testing under two erosion angles. In situ synthesized TaC phases could effectively alleviate the impact of solid particles in the erosion process, and improve the erosion resistance of the cobalt-based composite coating.

INFLUENCE OF VELOCITY, CONCENTRATION, AND SIZE OF SILT PARTICLES ON EROSION OF THERMAL SPRAYED Ni/TiO2/Al2O3 COATINGS

The presence of silt sediments in the flowing river is the primary reason for the severe failure of hydro-power turbine components. This study insights the effect of erosion parameters on the performance of two multi-dimensional novel compositions (namely Ni-40TiO2 and Ni-20TiO2-20Al2O3) developed on the CA6NM turbine steel by high velocity flame spray (HVFS) method. The Ni-40TiO2 coating with lower porosity, higher fracture toughness, and microhardness, showed the highest slurry erosion resistance than the other counterparts. This outstanding performance is attributed to the uniform distribution of the multi-dimensional TiO2 grains in the coating, which effectively reduces the material loss rate during slurry erosion. The Ni-40TiO2 coating indicated a mixed mechanism of material removal, while the brittle mechanism was observed in the case of Ni-20TiO2-20Al2O3 coating. A model has been proposed to estimate the erosion rate of these proposed coatings.

Improvement in Slurry Erosion and Corrosion Resistance of Plasma-Sprayed Fly Ash Coatings for Marine Applications.

Fly ash (FA), a multicompound mineral, is an industrial waste produced during coal burning in thermal power stations. It has been regarded as the most environmentally hazardous material. Furthermore, handling FA has been a significant challenge for many developing countries. Therefore, researchers have been exhorted to enhance its usage to counter its handling issues. FA is enriched with mullite, silica, and alumina. Having such mineralogy, FA can be envisaged as a promising candidate for combating erosion and corrosion in marine environments. With this motivation, the research aims to deposit as-received FA using the plasma-spraying technique onto a marine-grade steel substrate without additives and assess the performance of such coatings for erosion and corrosion properties. The coating has exhibited more than 100% improvement in microhardness. The erosion resistance was improved by ∼11% compared to that of the uncoated sample, which is attributed to the hardness to elastic modulus ratio (H/E) and its unique mineralogy. The minor improvement in erosion resistance was attributed to the coating’s poor fracture toughness. The erosion study shows that slurry concentration and rotational speeds were the most influential parameters. The scar depth was significantly shallower for FA-coated samples. The corrosion resistance has improved only by ∼13.49%, owing to the porous nature of the coating. Therefore, such coatings with appropriate improvements in their properties are expected to assuage both environmental and industrial challenges.

Design and development of non-recirculating type erosion test setup for hydraulic turbines

Slurry erosion phenomena are inevitable and commonly occurring processes in all types of hydro turbines and components that are exposed to sediment particles. The design of these components and the choice of the materials to resist erosion require laboratory testing using various erosion testing apparatus. These test apparatuses are designed specifically to meet the particular study requirements and to simulate the actual flow conditions in turbines. However, the design of these test apparatus must be flexible and versatile to assess erosion resistance under different combinations of operating conditions. The existing test rigs mostly comprise of rotary type with re-circulation of the slurry. This study proposes a new type of test setup that describes the sediment particles injection method into the system as well as immediate rejection of those particles striking the test specimen. The components of test rig and the test methodology are described. An accelerated tests have been performed on Cross-flow turbine to verify the suitability of the rig for erosion testing in laboratory environment. The design principle of this setup is to eliminate the limitations of the existing test rigs such as slurry ageing problem, use of acceleration tube to maintain the particle velocity and constant operating parameters (discharge velocity and pressure head). The non-recirculation of the slurry is maintained by the use of hydro cyclone as the particle separation device, which is found to have an efficiency of 97%. This test facility provides flexibility in the performance testing of miniature model of different types of hydro turbines with limited adjustments.

Impact of HVOF sprayed Vanadium Carbide (VC) based novel coatings on slurry erosion behaviour of hydro-machinery SS316 steel

In this research work, different compositions of VC (Vanadium Carbide) +CuNi-Cr (Cupronickel-Chromium) ranging from 0% to 100% were deposited over hydro-machinery steel (SS316) with the help of HVOF spraying system. The slurry erosion for different composition of coatings and bare SS316 steel have been evaluated with the help of slurry erosion testing machine. From the experiments, it was concluded that amongst all the developed coatings, 100% VC based coating has shown exceptionally good resistance to slurry erosion as compared to other composition of coatings owing to extra microhardness attained by VC granules. Brittle mode of erosion mode was observed for coating with VC as major constituent, which was reported to be converted to ductile mode with the increase in CuNi-Cr addition percentage.

Comparison of erosion performance of uncladded and WC-based laser cladded SS304 and SS410 steels

Myriad hydro materials have been encountered with the severe attacks of eroded particles during the operation, leading to degradation of target material and economic loss. In this study, Colmonoy-6+WC powders were deposited with the help of the laser cladding method on the bare SS304 and SS410 steel surfaces. Distinct properties of cladded surfaces, such as mechanical as well as metallurgical properties, were investigated. The influence of slurry erosion parameters like angle of impact and impact velocity of eroded particles on the cladded as well as uncladded steel specimen was analysed. Under all slurry erosion conditions, there was an escalation in slurry erosion resistance in the case of cladded steel as that of as-received steel specimens. In slurry erosion, the influence of the impact velocity of erodent particles is more against the impact angle. The scanning electron microscopy images of eroded uncoated steel specimens represent ductile behaviour along with the formation lip, ploughing etc., while eroded cladded steels exhibit brittle behaviour.

Tuning up sol-gel process to achieve highly durable superhydrophobic coating

Considering practical application of hydrophobic coatings, their durability is a matter of issue. Existing routes for mitigating the problem might not be applicable due to suggesting expensive facilities and non-eco-friendly materials. This paper introduces a robust, scalable cost-effective sol-gel route to obtain a durable superhydrophobic coating. Main component of the sol included Tetraethyl orthosilicate and Methyltriethoxysilane as sol matrix, Triethoxyoctylsilane as a low surface energy precursor, and fumed silica nanoparticles for roughness formation. A coating with a contact angle of 160° and very low sliding angle (<1°) was fabricated. The robustness of the coating was highly improved by incorporating sols with different pH values and spraying them alternately on glass substrate. As a result, the longevity of superhydrophobic behavior doubled under accelerated weathering conditions and reached 1500 h, which could be considered as a promising weathering durability. The coating retained its hydrophobicity after three runs of peeling tape test and 26 min continuous slurry erosion. Regarding sol-gel technique, the research demonstrated how to boost the durability of a superhydrophobic coating by only utilizing chemical characteristics of the sols and incorporating available facilities with non-fluoro based materials. The reaction mechanisms during the sol-gel process and the effect of each component on final properties were thoroughly discussed and fundamentally correlated to the obtained results.

A Study of Erosion-Corrosion Behaviour of Friction Stir-Processed Chromium-Reinforced NiAl Bronze Composite.

Corrosion is frequently viewed as a catastrophic and unavoidable disaster in marine applications. Every year, a huge cost is incurred on the maintenance and repair of corrosion-affected equipment and machinery. In the marine environment, as-cast nickel–aluminium bronze (NAB) is susceptible to selective phase corrosion. To solve this problem, chromium-reinforced nickel–aluminium bronze was fabricated using the friction stir process (FSP) with improved microstructures and surface properties. A slurry erosion–corrosion test on as-cast and FSPed composites demonstrated that the developed surfaced composite has lower erosion and corrosion rates than the as-cast NAB alloy. The erosion–corrosion rate increased with a decrease in the impact angle from 90° to 30° for both as-cast NAB and prepared composites, exhibiting a shear mode of erosion. The specimens at impact angle 30° experienced more pitting action and higher mass loss compared with those at impact angle 90°. Due to increases in the mechanical properties, the FS-processed composite showed higher erosion resistance than the as-cast NAB alloy. Furthermore, corrosion behaviour was also studied via the static immersion corrosion test and electrochemical measurements under 3.5 wt.% NaCl solution. In a static immersion corrosion test, the FSPed composite outperformed the as-cast NAB composite by a wide margin. The FSPed composite also demonstrated a reduced electrochemical corrosion rate, as revealed by the polarization curve and electrochemical impedance spectroscopic (EIS) data. This reduced rate is attributed to the formation of a Cr oxide film over its surface in the corrosive environment.

CFD simulation and optimization of slurry erosion of PDC bits

Polycrystalline diamond compact (PDC) bits are subjected to harsh erosive conditions under downhole. The erosion resistance partly determines the rate of penetration and footage of the bit. This work aims to investigate the effects of key factors on the erosion resistance of PDC bits through numerical simulation and field trials, and then to optimize the bit hydraulic designs. Computational Fluid Dynamics (CFD) and Discrete Phase Model (DPM) model were used to simulate the evacuation and impingement of cuttings on the bit body at the bottom of the well. The reliability of the numerical simulation was verified by the bit conditions after the field testing. Fuzzy grey relational analysis (FGRA) was then employed to rank the correlation degree of various affecting factors. The FGRA results show that the mass flow rate has the greatest effect on the average erosion rate of PDC bits, followed by the flow rate. The most erosion-vulnerable areas on the bit body are the webbings between cutters as well as the blade front. To improve the erosion resistance from the perspective of the bit hydraulic design, three novel hydraulic structures were proposed: the optimized nozzle orientation, the multi-ridge guide, and the extended curved nozzle. Numerical simulations indicate that all of these novel designs have great potential to enhance the erosion resistance of PDC bits with the customized extended curved nozzle showing the best.

High-velocity air fuel coatings for steel for erosion-resistant applications

High-velocity air fuel (HVAF) coating processes have advantages over conventional high-velocity oxygen fuel (HVOF) processes, resulting in coatings with superior properties. The present review first provides a concise overview of HVAF coatings, highlighting their advantages over HVOF coatings. Then, the fundamentals of solid particle, slurry, and cavitation erosion are briefly introduced. Finally, the performance of HVAF coatings for erosion-resistant applications is discussed in detail. The emerging research consistently reports HVAF-coatings having higher erosion resistance than HVOF-coatings, which is attributed to their elevated hardness and density and improved microstructural features that inhibit the surface damages caused by erosion. The dominant wear mechanisms are mainly functions of particle impact angle. For instance, the removal of the binder phase at high impact angles causes the accumulation of plastic strain on hard particles (e.g., WC particles) in the matrix, forming micro-cracks between the hard particles and the matrix, eventually decreasing the erosion resistance of HVAF coatings. The binder phase of HVAF-coatings significantly affects erosion resistance, primarily due to their inherent mechanical properties and bearing capacity of hard particles. Optimizing spraying parameters to tailor the microstructural characteristics of these coatings appears to be the key to enhancing their erosion resistance. The relationship between microstructural features and erosion mechanisms needs to be clarified to process coatings with tailored microstructural features for erosion-resistant applications.

Study on the slurry erosion wear of polycrystalline diamond compacts for application in fluidic oscillators

Fluidic oscillator made of tungsten carbide, the core component of the fluidic hammer, has a significantly reduced service life under the erosion wear of drilling fluids with solid particles. Polycrystalline diamond composite (PDC) has the potential to solve this issue due to its extremely high hardness and wear resistance benefits. However, few studies on the slurry erosion wear of PDC have been reported. In this paper, a modified slurry erosion experimental device based on submerged abrasive water jets was used to study the erosion resistance of four grades of PDCs with grain sizes of 2–3, 5, 10 and 25 μm respectively. The erosion surface of the damaged PDC was observed by scanning electron microscope (SEM) and the erosive mechanism of the PDC was analyzed. The experimental results showed that PDC had excellent slurry erosion resistance. The erosion rate of PDC was 1/192–1/43 of that of tungsten carbide when the jet velocity was 100 m/s. The erosion rates of PDC increased with the rise of jet velocity, impact angle and erodent particle size. In addition, the erosion performance of debris represented by quartz to PDC is greater than that of weighting agents represented by barite and hematite. Further research also showed that PDC with fine grain has greater erosion resistance than PDC with coarse grain, except PDC2 ~ 3. At a high impact angle, the erosive mechanism was forming the craters due to the crushing of diamond grains and the pits due to the overall pullout of diamond grains, while at a low impact angle, the erosive mechanism was ploughing and forming directional craters.