Effect Of SiC Particles Research Articles

Effect of SiC particles on microstructure and mechanical properties of SiCp/AZ91 magnesium matrix composite brazed joint

The impact of SiC particles on the microstructure, mechanical properties, and fracture morphology of magnesium alloy brazed joints was investigated. The brazing experiments of AZ91+AZ91, AZ91+SiCp/AZ91, and SiCp/AZ91+SiCp/AZ91 were carried out under the same technological conditions by using the self-designed special filler metal for magnesium matrix composites. The impact of SiC particles on the microstructure and mechanical properties of brazed joints was analyzed. The addition of Ti can effectively enhance the wettability of filler metal on SiC particles. The shear strength of SiCp/AZ91+SiCp/AZ91 joints is 76.0MPa. The shear strength of the joint is 43.4% higher than that of AZ91+ AZ91.

Wear performance of CoCrFeMnNi and CoCrFeMnNi-SiC coatings on 0Cr18Ni9Ti stainless steel fabricated by plasma transfer arc cladding

To enhance the wear resistance of stainless steel, CoCrFeMnNi and CoCrFeMnNi-SiC coatings were deposited on 0Cr18Ni9Ti via plasma transfer arc cladding. Effects of SiC particles on microstructure, microhardness and tribological properties of the CoCrFeMnNi coating were investigated. Results demonstrate that, in addition to the FCC solid solution and a small amount of oxide, the CoCrFeMnNi-SiC coating contains M23C6 and M7C3 phases, which exhibit an average hardness approximately 2.3 times that of the CoCrFeMnNi coating. Meanwhile, the wear resistance of the composite coating under different loads was improved, which was attributed to the fact that the high hardness SiC reduced the shear and adhesion between the coating and the mill ball, and the composite coating received abrasive and oxidative wear.

Solid-State Synthesis of SiC Particle-Reinforced AZ91D Composites: Microstructure and Reinforcement Mechanisms

Safe and efficient recycling of industrially generated machined chips is a high-priority technological issue. In this study, the effect of SiC particles (SiCp) on the microstructure and mechanical properties of SiCp/AZ91D composites is systematically analyzed, and the reinforcement mechanism of SiCp on composites is investigated. Different contents of SiCp/AZ91D composites are fabricated by solid-state synthesis. The results show that the incorporation of SiCp refined the grains of SiCp/AZ91D composites, which is related to the uniform distribution of SiCp at the grain boundaries. The strong bonding of SiCp with the AZ91D matrix inhibited the generation and extension of cracks, which led to the simultaneous increase in the yield strength (YS) and elongation (EL) of the SiCp/AZ91D composites. The mechanical properties of the 3 wt.% SiCp/AZ91D composites are the most superior, with an average grain size, Vickers hardness, ultimate tensile strength (UTS), YS, and EL of 6.69 ± 4.48 μm, 89.5 ± 2.5 HV, 341 ± 11 MPa, 172 ± 8 MPa, and 4.43 ± 0.18%, respectively. The reinforcement mechanisms of SiCp/AZ91D composites are mainly grain refinement and dislocation strengthening. Solid-state synthesis is an effective method for recycling magnesium alloy chips.

Enhanced wear resistance of cemented carbides reinforced with SiC nanoparticles

WC-10 wt% Co cemented carbides containing various amounts (0–4 wt%) of SiC nanoparticles were fabricated by vacuum sintering. The influence of SiC nanoparticles on microstructure, mechanical behavior, and dry sling wear resistance of the produced cemented carbides was explored. Results showed that SiC addition resulted in larger WC grains, thus lowering the hardness. Despite the hardness reduction, the wear resistance increased with increasing SiC content. The specific wear rate of the WC-10Co sample was 12.33 × 10−5 mm3/Nm that decreased to 1.86 × 10−5 mm3/Nm with 4 wt% nanoparticle addition. The improved wear resistance of nanocomposite samples was explained through the effects of SiC particles on modification of pore distribution, increased fracture toughness, and reduction of coefficient of friction. In the unreinforced WC-10Co cemented carbide, microstructural pores were found to be smaller but more numerous, resulting in extensive WC grain pullout. In addition, scuffing was recognized as the prevalent wear mechanism making friction trace completely unstable. In the nanocomposite samples, however, SiC nanoparticles stabilized and reduced the coefficient of friction. The change in friction condition from sliding to rolling abrasion revealed the microabrasive grooving as the predominant wear mechanism of the nanocomposites with enhanced wear resistance.

Stir Cast Al–Cu–SiCp Metal Matrix Composites: Effect of SiC Particles on the Mechanical Properties and Optimization of EDM Process Parameters

Stir Cast Al–Cu–SiCp Metal Matrix Composites: Effect of SiC Particles on the Mechanical Properties and Optimization of EDM Process Parameters

Synergistic Effect of Sic Particles and Whiskers on the Microstructures and Mechanical Properties of Ti(C,N)-Based Cermets.

The microstructure and mechanical properties of Ti(C,N)-based cermets with the addition of the SiC particles (SiCp) and SiC whiskers (SiCw), were systematically studied in this work. Firstly, the effect of SiCp on the cermets was investigated independently to determine the considerable total amounts of additives, and the results showed that 2.0 wt.% SiCp would lead to optimal properties of the cermet. Then, the influence of SiCp and SiCw additions with the variable ratio on the cermets was studied. The results indicated that when 1.5 wt.% SiCp and 0.5 wt.% SiCw were added; the cermets appeared with the best comprehensive properties, and the transverse rupture strength, hardness, and the fracture toughness of the cermets reached 2520.8 MPa, 88.0 HRA, and 16.56 MPa·m1/2, respectively. This was due to the synergistic strengthening and toughening effect afforded by the reasonable SiCp and SiCw addition, from which the smallest grain size, as well as the most uniform, and completed core-rim structure of the cermets, were achieved.

The Effect of Co-Deposition of SiC Sub-Micron Particles and Heat Treatment on Wear Behaviour of Ni–P Coatings

The purpose of the study is to assess the influence of SiC particles and heat treatment on the wear behaviour of Ni–P coatings when in contact with a 100Cr6 steel. Addition of reinforcing particles and heat treatment are two common methods to increase Ni–P hardness. Ball-on-disc wear tests coupled with SEM investigations were used to compare as-plated and heat-treated coatings, both pure and composite ones, and to evaluate the wear mechanisms. In the as-plated coatings, the presence of SiC particles determined higher friction coefficient and wear rate than the pure Ni–P coatings, despite the limited increase in hardness, of about 15%. The effect of SiC particles was shown in combination with heat treatment. The maximum hardness in pure Ni–P coating was achieved by heating at 400 °C for 1 h while for composite coatings heating for 2 h at 360 °C was sufficient to obtain the maximum hardness. The difference between the friction coefficient of composite and pure coatings was disclosed by heating at 300 °C for 2 h. In other cases, the coefficient of friction (COF) stabilised at similar values. The wear mechanisms involved were mainly abrasion and tribo-oxidation, with the formation of lubricant Fe oxides produced at the counterpart.

Effect of SiC particles on viscosity of 3-D print paste: A fractal rheological model and experimental verification

This paper studies the effect of the rheological property of SiC-based print paste on the 3-D printability at different SiC concentrations. The viscosity depends both the size and concentration of the added particles, a fractal rheological model is suggested and verified experimentally.

Effect of SiC particles on mechanical properties of multi pass friction stir processed AA7050

Effect of SiC particles on mechanical properties of multi pass friction stir processed AA7050

Effect of SiC particles on hot deformation behavior of closed-cell Al/SiCp composite foams

Aluminum foams are one of the best energy absorber materials for various impact protection applications; such as lightweight structural panels, packing materials, and energy-absorbing devices. In the present study, the hot deformation behavior of closed-cell Al/SiCp composite foams was investigated at different contents of SiC particles (3, 6, and 10 vol%) and at various temperatures (100, 200, 300, and 400 °C). High-temperature uniaxial compression tests with constant 0.1 s−1 strain rate were carried out to get the fundamental stress–strain profiles. The results showed that the yield strength, plateau stress, and energy absorption of composite foams increase with increase in the SiC content and decrease with increase in the deformation temperature. Mechanical properties and electron microscope photographs demonstrated that increase in the SiC particle contents, as microstructural obstacles, resulted in cell’s walls reinforcement against the early failure especially at the higher temperatures.

Experimental investigation on the effect of SiC particles in machining process of Al–5.3%CU-SiCp–Al2O3p hybrid nanocomposite by EDM

In this study, the EDM process was used to investigate the machining properties of Al–5.3% CU–SiCp–Al2O3p aluminum composite, including SR, MRR, and TWR. Input parameters consist of two electrical and non-electrical category which relates to EDM settings and the composite variables including volume fraction and size of silicon carbide particles in nano and micro scale. SEM and TEM were used to investigate particles and the base metal. Surface roughness measurement device and ball milling was used to measure and make MMC. The results show that increasing the volume fraction and the size of the reinforcing particles led to decrease in the material removing rate, and increasing in TWR and SR. During electrical discharge machining of Al-MMC with 5% SiC reinforcement, reducing the particle size from 40 μm to 100 nm resulted in approximately a four-fold increase in the material removing rate and 25% reduction in the tool wear. Besides, SR in 5 vol% aluminum composite samples consisting of 100 nm size particles has improved the surface quality for approximately five times in comparison with that of 20 vol% aluminum composite samples with 40 μm the particle size.

Effect of SiC Particles on Structure Property and Wear Resistance of AA6061/SiC Surface Composite Fabricated Via Friction Stir Processing

In the present study, the effect of the tool travel and rotational speed on structural properties and wear resistance of 6061Al/SiC surface composites produced via friction stir processing (FSP) has been investigated. It was found that when the rotational speed was increased from 630 to 2000 rpm or travel speed was reduced from 150 mm/min to 30 mm/min, the wear resistance improved. The enhancement of wear resistance was attributed to the desirable distribution of SiC particles in the base metal. Additionally, the obtained data indicate that a significant change in the reduction of the average grain size in the stir zone (SZ) is happened by increasing the rotational speed and decreasing the travel speed.

Investigation of Microstructure and Mechanical Behavior of Al/SiCp Composite Foams

Closed cell Al/SiCp composite foams are typically manufactured via casting method. The composite foams are made from aluminum foam into which SiCp is added at different concentrations (5, 10, 15 vol%). Effects of SiC particles on compressive and fatigue behaviors of composite foams were investigated. Results showed that, yield stress of the composite foams increases with increasing the strain rate. The yield stress and fatigue strength of samples of Al/SiCp composite foam containing SiCp at different concentrations increased with increasing the SiCp volume fraction up to 10 vol%. Based on the results, compressive strength of the foam sample containing 10 vol% SiCp with a density of 0.58 g cm−3 was higher than other samples. On the other hand, the lowest compressive strength was found to be that of the foam containing 5 vol% SiCp due to less than enough content of foam stabilizer in this foam. Moreover, at a given SiCp content, an increase in foam density increased the fatigue strength.

Cold Sprayed Additive Manufacturing of SiC/Al Metal Matrix Composite: Synthesis, Microstructure, Heat Treatment and Tensile Properties

In this study, cold spray technique was used as a solid-state additive manufacturing route to deposit a 5 mm thick SiC /Al metal matrix composite. Microstructure and tensile properties were analyzed via different heat treatment conditions (200 oC, 300 oC, 400 oC and 500 oC). Microstructure evolutions were characterized via scanning electron microscopy, X-ray diffraction (XRD) and energy-disperse X-ray spectroscopy (EDS), whilst mechanical properties were investigated via micro-tensile and hardness tests. It was established that the as-sprayed deposit fractured in a brittle manner and had appreciable tensile strength (85 MPa) mainly associated with intensive work hardening effect. At heat treatment conditions, tensile strength (104 MPa) and plasticity (1.5 %-5.2 %) were enhanced due to coarsening of pure Al splat through recrystallization-recovery-grain growth mechanisms. The splat size which controls strength changes from 30.9 ± 2.6 μm to 40.9 ± 4.8 μm, an appreciation of 32 % as heat treatment temperature increased. The main fracture mode at the heat treatment state was a ductile fracture. For plastically deformed splats, the flattening ratios (FR) revealed the top (1.5), middle (1.9) and near interfacial regions (2.2) due to peening effect of SiC particles. The Young moduli were in agreement with the experimental results.

Microstructure and mechanical properties in nano and microscale SiC-included dissimilar friction stir welding of AA6061-AA2024

ABSTRACTThis work investigates the effect of SiC particles on the microstructure and mechanical properties of dissimilar friction stir welding between AA6061-T6 and AA2024-T351. Two variations in the size of SiC particles, along the joint line, various groove width, and tool offset, were used for the welding. It was found that the joints made by rotational speed of 800 rev min−1, travelling speed of 31.5 mm min−1, groove width of 0.3 mm, and tool offset of 0.5 mm exhibited the most uniform distribution of particles for both micro- and nano-scale SiC particles. Additionally, the smaller and rounded equiaxed particles result in easier material flow, a more uniform metal matrix composite, the smallest grain size in the stir zone and the highest tensile strength.

Effect of SiC particles and the particulate size on the hot deformation and processing map of AZ91 magnesium matrix composites

Isothermal hot compression at the temperature range of 573–698K and strain rates of 0.005–1.0s−1 was used to investigate the flow behavior and processing characteristics of the nano-SiCp/AZ91 composites. Effects of the incorporated particles and their particulate size on the workability of the base alloy were then compared and discussed. Results show that compared with the monolithic AZ91 alloy, the incorporated nano-SiC particles effectively increase the flow stress of the composites by blocking the strain-induced dislocations, while effect of the micro-SiC particles varies due to the competition between pinning effect and particle stimulating nucleation (PSN) mechanism. Three domains of peak energy dissipation efficiency are identified in the processing map and the corresponding microstructures examined by EBSD indicate that continuous dynamic recrystallization (DRX) occurs during the compression. The instability characteristics at low temperature are severe mechanical twinning and micro-cracks, while that at high temperature is intergranular cracking. The incorporation of SiC particles enhances the high temperature (>655K) workability of AZ91 by increasing the upper limit of the processing strain rate and enables low temperature processing by decreasing the lower limit of the temperature. However, the added particles impose a side effect by enlarging the instability domain of the base alloy to a lower strain rate and even higher temperature.

Microstructures induced by excimer laser surface melting of the SiCp/Al metal matrix composite

Laser surface melting (LSM) was carried out on the SiCp/Al metal matrix composite (MMC) using a KrF excimer laser with a fluence of 7J/cm2. The re-solidification microstructure was characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM) equipped with energy dispersive X-ray detector, and X-ray diffraction (XRD) analysis. It was found that a 2.5μm thick melted layer was formed in the near-surface region, in which dissolution of the intermetallics and removal of the SiC particles occurred. The thermal and material response upon laser irradiation was simulated using three models, i.e. analytical model, finite element model (FEM) and smoothed-particle hydrodynamics (SPH) model. The effect of SiC particles on the LSM process, the mechanism of the SiC removal and the re-solidification microstructures in the melted layer were discussed. The simulation results were in good agreement with the experimental results and contributed to the generic understanding of the re-solidification microstructures induced by ns-pulsed lasers.

Effect of SiC Particles on the Electrical Conductivity of Epoxy Composites

In this paper, the behavior of the electrical conductivity of epoxy/silicon carbide (SiC) composites as a function of weight fraction and particle size of SiC at room temperature has been investigated. Composite samples were prepared by a mixture composed of the same amount of hardener and resin (5 mg) with different amounts (ranging from 5 mg to 7 mg) of silicon carbide powder with different grain sizes (400 and 800 grit). The conduction current was measured under different applied voltages from 1 to 10 kV (corresponding to applied electrical fields from 0.04 kV/mm to 0.4 kV/mm), and the composites microstructure was characterized by scanning electron microscopy. It was shown that the electrical conductivity of epoxy/SiC composites was found to increase when the weight fraction of SiC was increased and also to increase non-linearly as a function of the electrical field.

Effect of SiC Particles on Dielectrically Properties of Epoxy Reinforcement by (Bi-Directional) Glass Fiber

In this research was study the dielectric properties of the epoxy composites as a function of a frequency, “weight fraction- particle size” of fillers. Composite plates were prepared by incorporating fiber glass and SiC Particles of 0.1 μm, 3 μm, 40 μm diameter sizes at 10, 20, 30 and 40 weight percent in epoxy matrix. The experiments were performed to measure the dielectric constant and electrical conductivity in range (10-2000) KHz.

Effect of SiC Particles on Mechanical Properties of Laminated (SiCw+SiCp)/SiC Ceramic Composites

Laminated (SiCw+SiCp)/SiC ceramic composites were fabricated by tape casting and chemical vapor infiltration (CVI), and the effect of SiC particles on strengthening/toughening of the composites was investigated. When the SiC particle content was constant, the mechanical properties of (SiCw+SiCp)/SiC composites were increased with increasing SiC whisker content. When the SiC particle content was varied, the mechanical properties of (SiCw+SiCp)/SiC composites were dependent on SiC particle content. The addition of SiC particles can increase the strength of the matrix and the crack propagation resistance, the former increased the strength and the latter increased the toughness.