Content Of SiC Particles Research Articles

RETRACTED: Computational Investigations of the Impact Resistance of Aluminum–Epoxy–Laminated Composites

In this article, Charpy impact resistance of aluminum–epoxy–laminated composites in both crack divider and crack arrester configurations has been investigated. In both configurations, an analytical investigation has been carried out to evaluate the effects of layer thickness on impact resistance of the specimens. A model based on gene expression programming for predicting impact resistance of the specimens has been presented. To build the model, training and testing were conducted using experimental results from 126 specimens produced of two basic composites. The used data as inputs of gene expression programming models are arranged in a format of seven parameters that cover the thickness of layers, the number of layers, the adhesive type, the crack tip configuration, the content of SiC particles, the content of methacrylated butadiene–styrene particles, and the number of test trials. According to these input parameters, in the gene expression programming model, the impact resistance of each specimen was ...

PREPARATION OF NANO-SIZED SiC REINFORCED NiTi SHAPE MEMORY COMPOSITES AND THEIR MECHANICAL PROPERTIES AND DAMPING BEHAVIOR

NiTi shape memory alloys have attracted significant attention for applications in various fields in the past decades. Although porous NiTi alloys exhibit lower density compared with the dense ones, they are inevitably lower in strength, storage modulus and damping capacity. Therefore, it is imperative to study and improve the compressive performance and storage modulus in porous NiTi alloys. In this study, the nano-sized SiC particle reinforced NiTi shape memory alloy based composites (SiC/NiTi) have been successfully fabricated by means of a step powder-sintering method, which show unique characteristics of lightweight, high strength and stable superelasticity. The fabricated SiC/NiTi composites possess almost the same equivalent strength compared with dense NiTi alloys. On the other hand, they are in the nature of higher strength, including compressive strength and equivalent compressive strength, than porous NiTi alloys. Furthermore, the strength increases with increasing contents of SiC particles. It has been indicated that the addition of SiC particles has a slight influence on the phase composition of the SiC/NiTi composites, while the martensitic phase transformation temperatures of the composites keep unchanged compared with the NiTi alloy without SiC reinforcement. Meanwhile, the fabricated composites inherit the high damping performance of the NiTi matrix, and thus exhibit a high storage modulus.

Optimization of the Process Conditions Based on Depositing Rate and Micro-Hardness for Electroless Ni-P-Nano SiC Composite Plating

The orthogonal test method has been used to study the effects of the concentration of SiC, the speed of mixing, the temperature and the surfactants on depositing rate and micro-hardness, and obtained the optimized technological scheme and fine Ni-P-SiC composite coating. The results showed that using citric acid-acetic acid as complexing agents can obtain high speed of depositing and homogeneous coating with SiC well-distributed. Among the technological parameters, the effects of temperature on depositing rate is biggest, and the surfactants is next; the effects of the concentration of SiC particles on micro-hardness is biggest, and the surfactants is next. Give consideration to depositing rate and stability of the liquid, the temperature should be controlled at 82±2°C, the concentration of SiC particles and surfactants should be controlled in 4g/L and 60mg/L.

Influence of SiC particles size and undercooling on AZ91 based composite heterogeneous nucleation model parameters

The aim of this paper was to determine fitting parameters in grain density of the magnesium primary phase function in AZ91/SiC composite heterogeneous nucleation model. Nucleation models have parameters, which exact values are usually not known and sometimes even their physical meaning is under discussion. Those parameters can be obtained after statistical analyze of the experimental data. Specimens of fourteen different composites were prepared. The matrix of the composite was AZ91 and the reinforcement was SiC particles. The specimens differs in SiC particles size (10 μm, 40 μm, 76 μm) and content (0 wt.%, 0.1 wt.%, 0.5 wt.%, 2 wt.%, 3.5 wt.%). They were taken from the region near to the thermocouple, to analyze the undercooling for different composites and its influence on the grain size. The specimens were polished and etched. The mean grain size for each specimen was measured. Specific undercooling for each composite was found from characteristic points on cooling rate curve. Microstructure and therm...

Microstructure and Wear Behavior of SiC<sub>P</sub>-Reinforced Magnesium Matrix Composite by Cold Spraying

In this paper, dense AZ91D/SiC composite coatings were fabricated by cold spraying. The microstructure and microhardness of the as-sprayed coatings were investigated. The results show that the content of SiC particles in the composite coating was 23.6 ± 7.5 vol.%. The microhardness of the composite coating was improved to 140 HV0.3 due to the enhancement of SiC particles, compared to 98 HV0.3 for the pure AZ91D coating. The wear behavior of the composite coating in an ambient condition was studied through a ball-on-disc dry sliding test system. The composite coating showed higher friction coefficient and lower wear rate than the pure AZ91D coating. The wear mechanism of the composite coating was discussed.

RETRACTED ARTICLE: Analytical investigations and fuzzy logic-based modeling of the impact resistance of aluminum-epoxy laminated composites

In the present paper, Charpy impact resistance of aluminum-epoxy laminated composites in both crack divider and crack arrester configurations has been investigated. In both configurations, an analytical investigation has been carried out to evaluate the effects of layers thickness on impact resistance of the specimens. A model based on fuzzy logic for predicting impact resistance of the specimens has been presented. For purpose of building the model, training and testing using experimental results from 126 specimens produced from two basic composites were conducted. The data used for the input data in fuzzy logic models are arranged in a format of 7 input parameters that cover the thickness of layers, the number of layers, the adhesive type, the crack tip configuration, the content of SiC particles, the content of methacrylated butadiene-styrene particles and the number of test trial. According to these input parameters, in the fuzzy logic model, the impact resistance of each specimen was predicted. The training and testing results in the fuzzy logic model have shown a strong potential for predicting impact resistance of aluminum-epoxy laminated composites.

RETRACTED: Analytical modeling impact resistance of aluminum–epoxy laminated composites

Abstract In the present paper, impact resistance of aluminum–epoxy laminated composites in both crack divider and crack arrester configurations has been investigated analytically. Charpy impact specimens with different number of layers and different adhesives were produced and the obtained Charpy impact resistance was studied analytically. In addition, a model based on adaptive network-based fuzzy inference systems (ANFIS) for predicting impact resistance of aluminum–epoxy laminated composites in both crack divider and crack arrester configurations has been presented. For purpose of building the model, training and testing using experimental results from 126 specimens produced from two basic composites were conducted. The data used for the input data in ANFIS models are arranged in a format of seven input parameters that cover the thickness of layers, the number of layers, the adhesive type, the crack tip configuration, the content of SiC particles, the content of methacrylated butadiene–styrene particles and the number of test trial. According to these input parameters, in the ANFIS model, the impact resistance of each specimen was predicted. The training and testing results in the ANFIS model have shown a strong potential for predicting impact resistance of aluminum–epoxy laminated composites.

Influence of submicron SiC particle addition on porosity and flexural strength of porous self-bonded silicon carbide

In the present study, porous self-bonded silicon carbide (SBSC) ceramics were fabricated at temperatures ranging from 1700 °C to 1800 °C using SiC powders, silicon and carbon as starting materials. The amount of (Si + C) powders is fixed and the influence of submicron SiC particle content (0 wt.% to 80 wt.%) on the porosity and strength of the ceramics was studied. The experimental results illustrate that the packing efficiency increased with the increase in submicron particle content to 40 wt.%, and thereafter decreased. The green porosity largely determines the final porosity of the sintered specimens, irrespective of the submicron SiC particle content. The flexural strength increased with the addition of submicron particle content and sintering temperature. Typically, SBSC ceramics prepared using 80 wt.% submicron SiC particle content possess 46% porosity and 42 MPa flexural strength when sintered at 1800 °C.

The Wear Behavior of Electroless Ni-P/SiC Composite Coating

The Ni-P/SiC composite coating was prepared by chemical deposition technique. The micro-structure and wear behavior of electroless Ni-P/SiC composite coating was investigated. The results show that the composite coating was dense and no any defects at the interface between substrate and electroless composite coating. Its thickness could reach 40 μm. Wear resistance was increased with the increasing content of SiC particles for single composite coating when the SiC concentration was less than 6g/L, then decreased with the increased SiC concentration. The wear resistance of gradient composite coating was improved above 16% comparing with the single composite coating. The wear resistance of T1 gradient coating was best for all electroless Ni-P/SiC composite coatings because the bonding strength was improved owing to the gradient change of SiC content.

Experimental Research and Performance Testing of Fe-Based Composite Plating

By using self-made asymmetric AC - DC power supply and adding SiC in ferrous chloride bath, the high performance Fe-SiC iron-based composite coatings were prepared by electrodeposition method. The effect of Phase, composition and SiC particle content on the surface morphology, structure, hardness, wear resistance and corrosion resistance of Fe-SiC composite coatings were studied. The process parameters of Fe-SiC composite plating were optimized. The results showed that the micro-cracks in composite coatings would reduced and the hardness, wear resistance and corrosion resistance will increased by adding SiC particles under the condition of optimum process.

Preparation of SiC-Low Chromium Cast Iron Composite Material by Cast-Infiltration

Low-chromium cast iron as the matrix, SiC particles as reinforcement, water glass sand in ordinary dry type, no negative pressure conditions, the use made of composite diffusion agent, prepared the surface of SiC particulate reinforced steel matrix composites. The results show that: SiC particles penetrate the surface of the composite material has excellent wear resistance, with the content of SiC particles increase the wear resistance of composite cast layer increased, when the SiC particle content of 20%, the wear resistance to achieve the best good. The hardness of up to 3000HV composite layer above. Smooth casting surface roughness, dimensional accuracy is more accurate, composite layer and substrate is good.

Study on Preparation and Properties of Fe-SiC Composite Coatings

To improve the mechanical product hardness, wear resistance and corrosion resistance, Fe-SiC composite plating process and properties have been studied. By using self-made asymmetric AC - DC power supply and adding SiC in ferrous chloride bath, the high performance Fe-SiC composite coatings are prepared by electrodeposition method. The effect of Phase, composition and SiC particle content on the surface morphology, structure, hardness, wear resistance and corrosion resistance of Fe-SiC composite coatings are studied. The process parameters of Fe-SiC composite plating are optimized. The results show that the micro-cracks in composite coatings will reduced and the hardness, wear resistance and corrosion resistance will increased by adding SiC particles under the condition of optimum process.

Damage development of Al/SiC metal matrix composite under fatigue, creep and monotonic loading conditions

A consolidation of powders using the KOBO method at elevated temperature was elaborated for production of Al/SiC metal matrix composite (MMC). The observations of the mean strain and inelastic strain range during the force controlled high cycle fatigue (HCF) tests identified the ratcheting mechanism combined with mechanism characterized by cyclic plasticity. Damage parameters were calculated on the basis of strain signal acquisition during fatigue tests. Fatigue properties, creep resistance and lifetime of Al/SiC MMC were gradually improved with the increase of the SiC particles content. The microstructural observations of the material before and after tests were also performed.

Electrolytic deposition of Ni–Co–SiC nano-coating for erosion-enhanced corrosion of carbon steel pipes in oilsand slurry

Erosion-enhanced corrosion constitutes an essential threat to the integrity of the oilsand slurry hydrotransport system. In this work, a Ni–Co–SiC nano-coating technology was developed by electrolytic deposition on the carbon steel surface to address this problem. Results demonstrate that the coating develops a compact structure, improving significantly the mechanical properties, including hardness and wear resistance, and the resistance to erosion-enhanced corrosion. The incorporation of SiC nano-particles in the coating, rather than the coating thickness, plays an essential role in the improvement of the coating properties and performance. Furthermore, the electrodepositing parameters, including concentration of SiC in the bath electrolyte, cathodic current density, current pattern and temperature, affect remarkably the content of SiC particles in the coating, and thus the coating performance. An optimal condition was proposed to fabricate the nano-coating for this purpose.

Tensile Properties of Aluminum Matrix Composites Reinforced with Submicron SiC Particles

The submicron SiC particulates reinforced aluminum metal matrix composites (Al MMCs) were fabricated by powder metallurgy technique, and their microstructure and tensile properties were investigated. The results show that the Al MMCs obviously exhibit an increase in ultimate tensile strength and yield strength due to both dislocation density strengthening and dispersion strengthening mechanisms, and a decrease in elongation with increasing concentration of SiC particles compared with those of the unreinforced Al due to the agglomeration of SiC superfine particles. The tensile fracture surfaces show that the damage mechanism of the Al MMCs can change with the concentrations of SiC superfine particles and the cracks easily originate from the SiC agglomerations.

Electrochemical behavior of NiPSiC composite coatings: Effect of heat treatment and SiC particle incorporation

AbstractThis paper describes the effects of heat treatment and of SiC particle incorporation on the electrochemical behavior and physical structure of NiP (17 at% P) composite coatings. The deposits were obtained by electrodeposition with various contents of SiC particles in the plating bath and heat treated at 420 °C. The physical structure was investigated by inductively coupled plasma atomic emission spectrometry (ICP‐AES), X‐ray diffraction (XRD), and scanning electron microscopy (SEM – image analysis). The electrochemical behavior of the resultant composite coatings was determined by chronopotentiometry, electrochemical impedance spectroscopy, and potentiodynamic measurements in 0.6 M NaCl solution at pH 6. Heat treatment showed a positive effect on the electrochemical behavior of NiP coatings, shifting the open circuit potential toward less active potentials. The incorporation of SiC particles inhibited pit nucleation on the NiP composite coating, with or without post‐heat treatment. However, heat treatment in the NiPSiC seemed to induce cracks in the metallic matrix, initiating at the SiC particles, possibly caused by the contraction in the metallic matrix. The cracked structure promoted localized corrosion, while coatings without heat treatment resulted in a general and uniform corrosion.

The kinetics of Ni–Co/SiC composite coatings electrodeposition

Ni–Co/SiC composite coatings with various contents of SiC particles were electrodeposited in a modified Watt's type of Ni–Co bath containing suspended 20 nm SiC particles. Deposition parameters including current density, bath SiC concentration and magnetic stirring rate were optimized for the highest amount of the SiC codeposition: the current density of 4 A/dm 2, 40 g/dm 3 SiC concentration and 480 rpm stirring rate. In order to study the SiC particles codeposition, the Guglielmi's model of codeposition was modified for high volume percentages of the second phase and the modified model was employed to explain the effects of deposition parameters on the kinetics of the particles codeposition. Moreover, the influence of suspended SiC particles on the anomalous electrodeposition of Ni 2+ and Co 2+ ions was studied. In the presence of these particulates, anomalous electrodeposition of Ni 2+ and Co 2+ ions was enhanced.

Microstructure evolution of Si 3N 4/Si 3N 4 joint brazed with Ag–Cu–Ti + SiCp composite filler

The Si 3N 4 ceramic was brazed by Ag–Cu–Ti + SiCp composite filler (p = particle) prepared by mechanical mixing. Effects of the content of Ti and SiC particles on microstructure of the joint were investigated. A reliable Si 3N 4/Si 3N 4 joint was achieved by using Ag–Cu–Ti + SiCp composite filler at 1173 K for 10 min. A continuous and compact reaction layer, with a suitable thickness, forms at the Si 3N 4/braze interface. The SiC particles react with Ti in the brazing layers, forming Ti 3SiC 2 thin layers around the SiC particles themselves and Ti 5Si 3 small particles in the Ag[Cu] and Cu[Ag] based solid solution. The higher content of SiC particles in the filler (≥10 vol%) depresses interfacial bonding strength between the Si 3N 4 substrate and composite brazing layer due to the thinner reaction layer and the bad fluidity of the filler. The Ti 3SiC 2 → TiC + Ti 5Si 3 reaction occurs when Ti concentration around SiC particles in the filler increases.

Microstructure and mechanical properties of Si 3N 4/Si 3N 4 joint brazed with Ag–Cu–Ti + SiCp composite filler

Ag–Cu–Ti + SiCp composite filler was used as brazing material to join Si 3N 4 ceramic. Effects of the content of Ti (4–10 wt.%) and SiC particles (0–15 vol.%) on properties and microstructure of the joints were investigated. A reliable Si 3N 4/Si 3N 4 joint was achieved by using Ag–Cu–Ti + SiCp composite filler brazed at 1173 K for 10 min. A continuous and compact reaction layer with suitable thickness was formed at the Si 3N 4/braze interface. The SiC particles reacted with Ti in the brazing layers, forming Ti 3SiC 2 thin layers around the SiC particles and Ti–Si phases. However, when the Si 3N 4/Si 3N 4 joints were brazed by the filler with the aptotic content of Ti, higher content of SiC particles (≥10 vol.%) in the filler decreased interfacial bonding strength due to bad fluidity of the filler and insufficient reaction between the Ti element and the Si 3N 4 substrates. The Ti 3SiC 2 → TiC + Ti–Si reaction occurred when Ti concentration was higher around SiC particles in the filler. The highest average three-point bending strength of 506.3 MPa was retained when x was 8 wt.% for Si 3N 4/Si 3N 4 joints brazed with (Ag 72Cu 28) 100− x Ti x + 5 vol.% SiCp composite filler.

Microwave absorbing property and complex permittivity of nano SiC particles doped with nitrogen

Abstract Microwave absorbing property and complex permittivity of the nano SiC particles doped with nitrogen within the frequency range of 8.2–18 GHz were investigated. The nano SiC particles doped with nitrogen was synthesized from hexamethyldisilazane ((Me 3 Si) 2 NH) (Me:CH 3 ) by a laser-induced gas-phase reaction. The complex permittivities of the composites can be tailored by the contents of the nano SiC particles. The real part ( ɛ ′) and imaginary part ( ɛ ″) of the complex permittivity, and the dielectric dissipation factor (tg δ = ɛ ″/ ɛ ′) of the composites increase with the volume filling factor ( v ) of the nano SiC particles doped with nitrogen. The ɛ ′ and ɛ ″ of the composites can be effectively modeled using second-order polynomials ( ɛ ′, ɛ ″ = A v 2 + B v + C ). The ɛ ′ and ɛ ″ of the nano SiC particles doped with nitrogen decrease with frequency. The high ɛ ″ and tg δ of the nano SiC particles doped with nitrogen are believed to be caused by the substitution of nitrogen for carbon in the nanocrystals of SiC. The single layer composites of 7 wt% nano SiC particles doped with nitrogen with a thickness of 2.96 mm achieved a reflection loss below −10 dB (90% absorption) at 9.8–15.8 GHz, and the minimum value was −63.41 dB at 12.17 GHz. The reflection loss calculations show that the prepared nano SiC particles doped with nitrogen are good electromagnetic wave absorbers in the microwave range.