SiC Content Research Articles

Toughening and strengthening of Silicon carbide/Aluminium composites by the optimization of Fe3O4 distribution at hot rolling

To produce SiC /Aluminum composites with a 35 % SiC content, hot pressing and hot rolling were the successful methods. In-depth investigations of the mechanical characteristics, anisotropy and interface circumstances of SiC/Aluminum mixtures are carried out after hot rolling of the material. The distribution of interfacial Fe3O4 nanoparticles was enhanced by hot rolling, resulting in an increase in both strength and ductility. Because of Fe3O4 nanoparticles aggregating at the SiC/Aluminum matrix interface after the composites were sintered, the binding strength between the two materials was decreased. After rolling, aluminium nanoparticles diffused into the Al grain interior, creating a strong bond among SiC particles and Aluminium composites. The Fe3O4 nanoparticles detached within the Aluminum grain internal also contributed to the material's ductility and strength by increasing the material's Orowan strength. In-depth discussion is provided on the composites' mechanisms for strengthening and toughening.

Experimental research and effect on mechanical and wear properties of aluminium based composites reinforced with Zn/Sic particles

In this investigation, Al-/Zn/SiC composite with various weight percentages of SiC were manufactured via powder metallurgy (PM) route. Using the powder metallurgy approach, composites are created by changing the amount of SiC in the range of 5–15% by weight respectively. Under fretting wear test, the tribological characteristics of these composite materials were examined at load (5N, 10N, 15N), constant control parameters like that of frequency (20 Hz), temperature (at room temperature), stroke length (0.50 mm) and time (20 min). The test findings showed that compared to the unreinforced alloy the SiC-reinforced aluminium hybrid matrix composites (AHMC’s) showed a lower wear loss (i.e. 0.002 gm). It was found that friction coefficient of Al/5%Zn/10%Sic composites reduced with increasing applied load. Additionally, with an increase in the SiC content, the mechanical properties i.e. Tensile Strength and Hardness of fabricated composite increases compared to the base material. This study showed that the wear resistance of aluminium composites is greatly increased by the addition of both a synthetic reinforcement (i.e. Silicon Carbide) and a low melting point reinforcement (i.e. Zinc, 99%, −325 mesh). Overall, our findings show that AHMC’s might be regarded as a superior material in industries like aerospace and automotive engineering, where mechanical and wear properties play an important role.

Experimental investigations of AA6061/Al2O3/WC/SiC hybrid metal matrix composite fabricated by two step stir casting

ABSTRACT Hybrid metal matrix composites have emerged as an epicentre of material research due to their vast applications and a wide array of reinforcement combinations. In this experiment, two-step stir casting method had been used to fabricate hybrid aluminium 6061 metal matrix composites. The micro-structural and mechanical evaluation (density measurement, impact, tensile, hardness, and flexural) of the fabricated aluminium (AA6061) hybrid metal matrix composite had been performed. The reinforcements used were Al2O3 (3 wt.%), RHA (2 wt.%), WC (2 wt.%), and SiC (5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%). The mechanical properties had been found to improve with increasing wt.% of SiC. The maximum experimental density (2999.2 Kg/m3), impact energy (6 J), tensile strength (130.15 N/mm2), hardness (35 HRA), and flexural load (6720 N) had been obtained with 20 wt.% SiC reinforcement. The presence of reinforcements (Al2O3, RHA, WC, SiC) and their uniform distribution in the Al6061 matrix was confirmed by micro-structural analysis. Other surface morphological information like agglomeration of less soluble alumina and presence of dendrite structures at higher SiC concentration were also revealed. Further, the observations from this investigation have been compared with already existing literature. In conclusion, prospects for future research have also been explored.

Nanocomposite Co-nSiC coatings electrodeposited from cobalt-gluconate bath via pulse reverse plating technique with anionic surfactant

The co-deposition of silicon carbide nanoparticles (50 ± 5 nm diameter) in an electrodeposited metallic cobalt matrix has been investigated under pulse reverse plating (PRP) conditions with the inclusion of an anionic surfactant. The effect of variable anionic surfactant content in the plating solution with a particle content of 5 g L−1 was evaluated using both direct current (DC) plating and PRP. The particle content of the coatings was investigated by varying the cathodic cycle during PRP by varying the cathodic cycle time between 30 and 240 s per pulse whilst maintaining a fixed anodic charge. The coatings were assessed by SEM and EDX in cross section to determine the effect of PRP parameters and anionic surfactant content on the particle content of. With no anionic surfactant, all coatings produced contained a similar particle content. Addition of anionic surfactant affected the SiC content of DC and PRP coatings. PRP combined with anionic surfactant to produce an electrophoretic nanoparticle delivery mechanism increasing the SiC content of coatings compared to DC coatings. Higher SiC content was observed at shorter cathodic cycle times.

The microstructural and mechanical behavior of in-situ synthesized ZrB2–ZrC and ZrB2–SiC–ZrC composites: A comparative study

In the present investigation, the ZrB2–ZrC and ZrB2–SiC–ZrC based composites were fabricated via an in-situ reduction mechanism using ZrO2, B4C, Si, and graphite fine powder at 1900 °C in an argon atmosphere. The boro/carbothermal reduction produced nano-sized ZrC grains with ZrB2 particles, whereas the incorporation of Si content produced nano-sized homogeneous distributed SiC grains with ZrB2–ZrC particles. In the ZrB2-based composite densification, microstructure, mechanical, and chemical state identification of elements were investigated. The densification of the samples was enhanced with the formation of ZrC and SiC content, which was correlated with the micrographs and mechanical properties of the samples. The chemical state identification confirms the trace amount of intermediate zirconium oxycarbide in the ZrB2-based composite. Compared to binary ZrB2–ZrC composite, ZrB2–SiC–ZrC composite has finer microstructure and higher densification. The strength of the ZrB2–ZrC and ZrB2–SiC–ZrC composite was decreased by 458 MPa and 406 MPa, respectively. Similarly, the indentation hardness of the samples was increased by 14.2 GPa–15.3 GPa, and fracture toughness was 5.5 ± 0.5 MPa m1/2 to 6.15 ± 0.4 MPa m1/2.

Study of mechanical properties and wear behavior of hybrid Al/(Al2O3+SiC) nanocomposites fabricated by powder technology

In recent years, aluminum-based hybrid nanocomposites have been attractive for industries such as automotive and aerospace due to the remarkable properties. In the present study, aluminium matrix composites reinforced with different amounts of SiC and Al2O3 nanoparticles (5, 7.5, 10 wt%), as reinforcements, were fabricated using powder metallurgy technique. Firstly, the nanocomposite powders were mechanically milled followed by hot pressing method. Then, the specimens were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrum (EDS), hardness, tensile strength and wear testing. The uniform distribution of SiC and Al2O3 nanoparticles in aluminium matrix was confirmed by microstructural analysis. The results showed that the hardness and wear resistance of nanocomposite samples were increased by increasing of SiC content to 10 wt%. The dominant wear mechanism was found to be the abrasive wear which accompanied with oxidation wear for nanocomposite samples. Additionally, the tensile strength test results showed that the hybrid composite sample containing 7.5 wt% nano SiC showed the highest tensile strength (83 MPa) compared to other hybrid composites.

Microstructure, Mechanical and Wear Properties of W-Si-C Composites Consolidated by Spark Plasma Sintering

W-Si-C composites with high relative densities and good mechanical and wear properties were successfully prepared by spark plasma sintering. The influence of SiC content on the relative density, microstructure, mechanical properties and wear characteristics was investigated. The results indicated that the reaction between SiC and W at their interface produced W2C and W5Si3. SiC also reacted with oxygen impurities at the W grain boundary to form SiO2. The purification of the grain boundaries of W was carried out by SiO2 synthesis. Reactive sintering reduces the free energy of the system and facilitates the densification process of W-Si-C composites. This results in a significant increase in the relative density of W-Si-C composites, which reaches a maximum of 98.12%, higher than the 94.32% of pure tungsten. The hardness significantly increases from 4.33 GPa to 8.40 GPa when the SiC content is 2 wt% compared to pure tungsten due to the generation of the hard ceramic phase and the increase in relative density. The wear resistance of the W-Si-C composites was significantly improved with little SiC addition. The wear rate significantly decreased from 313.27 × 10−3 mm3/N·m of pure tungsten to 5.71 × 10−3 mm3/N·m of W-0.5 wt% SiC. SEM analyses revealed that the dominant wear mechanism of pure tungsten was attributed to fatigue wear, while that of W-Si-C composites was due to abrasive wear.

Prediction of the tensile properties of ultrafine grained Al–SiC nanocomposites using machine learning

Prediction of the tensile properties of ultrafine grained Al–SiC nanocomposites using machine learning

Influence of characteristic parameters of SiC reinforcements on mechanical properties of AlSi10Mg matrix composites by powder metallurgy

Influence of characteristic parameters of SiC reinforcements on mechanical properties of AlSi10Mg matrix composites by powder metallurgy

Frictional performance of C/C–SiC materials at high loads: The role of composition and third-body

Frictional performance of C/C–SiC materials at high loads: The role of composition and third-body

Wetting of Cu-SiC Composite Material Modified by Nanosecond Laser Radiation and Liquid Spreading over It

In the framework of this work, the surface properties of Cu-SiC composite material were studied when spreading micro- and nanoliter liquids. The Cu-SiC samples with a SiC content of 5 to 20 wt.% were fabricated by spark plasma sintering at temperatures from 700 to 850 °C. The Cu-SiC surfaces were processed by two different methods: using abrasive materials and nanosecond laser radiation. Surface analysis was performed by scanning electron microscopy, profilometry, energy dispersive spectroscopy and Vickers methods. The surface properties (wetting and dynamic characteristics of spreading) were studied using a shadow optical technique when interacting the Cu-SiC surfaces with water (up to 10 μL). It was proved that the recorded deterioration of the wettability properties of Cu-SiC surfaces processed by abrasive materials with an increase in their sintering temperature and the reason for the spontaneous hydrophobization of the Cu-SiC composite materials modified by nanosecond laser radiation, are due to the adsorption of airborne hydrocarbon contaminants, similar to the known wetting inversion of metal surfaces. It was established that the wetting properties of materials prior to modification by laser radiation do not affect the intensity, duration of stages, and steady-state values of contact angles upon wetting inversion of Cu-SiC composite materials. It was also found that the processing of Cu-SiC surfaces by laser radiation makes it possible to change the dynamic characteristics of the liquid spreading (at a flow rate of 5 μL/min, the liquid front speed is more than three times, and the dynamic contact angles are in the range of 30°).

Corrosion and wear resistance of SiC:Cu:a-C composite films prepared by magnetron sputtering

Corrosion and wear resistance of SiC:Cu:a-C composite films prepared by magnetron sputtering

Microstructure and mechanical properties of SiC-reinforced Inconel 718 composites fabricated by laser cladding

Microstructure and mechanical properties of SiC-reinforced Inconel 718 composites fabricated by laser cladding

Effect of SiC content on microstructural evolution and tribology properties of laser-clad TiC-reinforced Ti-Al-Si composite coatings

Effect of SiC content on microstructural evolution and tribology properties of laser-clad TiC-reinforced Ti-Al-Si composite coatings

Preparation of foamed ceramics from steel slag with high calcium and iron content

AbstractIn this paper, steel slag foamed ceramics were fabricated by using steel slag, kaolin, feldspar, and quartz as main raw materials, and adding SiC as high‐temperature foaming agent. The effects of steel slag content and SiC particle size on porosity and mechanical properties of foamed ceramics were researched. Results indicate that when content of steel slag is 40 wt%, and particle size of SiC is 20 µm, foamed ceramics exhibited optimized properties: water absorption rate of 2.59%, total porosity of 55.91%, bulk density of 1.33 g·cm−3, and compressive strength of 1.21 MPa. The results show that with the increase of steel slag content, the phase composition of foamed ceramics changes, and foam process is hindered. The increase of steel slag content contributes to the formation of diopside. Fe3+, Fe2+ in liquid phase enter into diopside by solid solution, the amount of liquid phase decreases. Liquid phase mass transfer slows down, and content of SiC in liquid phase decreases, so that the porosity decreases. At the same steel slag content, different SiC particle size affects the difference between pressure inside the closed pore and surface pressure, thereby the porosity changes.

Design and mechanical properties of SiC reinforced Gd2O3/6061Al neutron shielding composites

Design and mechanical properties of SiC reinforced Gd2O3/6061Al neutron shielding composites

Response of soil microbial Communities, inorganic and organic soil carbon pools in arid saline soils to alternative land use practices

Response of soil microbial Communities, inorganic and organic soil carbon pools in arid saline soils to alternative land use practices

Microwave heating efficiency and frost resistance of concrete modified with powder absorbing materials

Microwave heating efficiency and frost resistance of concrete modified with powder absorbing materials

Local anti-ablation modification of uneven-density C/C composites with the ZrC-SiC composite ceramics

To lower the cost and preparation period of C/C-ZrC-SiC composites, the uneven-density C/C composites (with a high density in the inner region and low density in the surface region) are designed and prepared by thermal gradient CVI process, followed by local modification of ZrC-SiC composite ceramics by precursor infiltration-pyrolysis (PIP) mothed to improve the anti-ablation performance. The ablation tests show that the SiC contents have a great influence on the microstructure of ZrO2 grains at the ablation center by adjusting the ablation temperature and the melting point of ZrO2 grains. Results prove that about 20 wt% SiC is optimum for the ZrC-SiC composite ceramics to perform best during the ablation and modify the uneven C/C composites prepared in this work. Besides, the dense C/C matrix would stop the liquid ZrO2-SiO2 phase from running off, and in return, the dense ZrO2-SiO2 phase would sink into the surface within the ablated region protecting the material beneath, which could protect the carbon fibers of the surface region and the dense C/C matrix beneath.

Investigations on the microstructure and properties of yttria and silicon carbide reinforced aluminium composites

Powder Metallurgy (PM) was used to synthesize SiC (0, 5, 10, 15 & 20wt%) and 1wt% Yttria (Y2O3) reinforced aluminium (Al) metal matrix composites. The Al-SiC-Y2O3 hybrid composites samples were prepared for density (ρ), hardness (VHN), mechanical, tribological, and microstructural studies in accordance with ASTM standards. SEM images revealed an even spreading of SiC particles throughout the Al matrix and composition was verified by the characterization techniques. The addition of SiC and Y2O3 to their respective composites improved the VHN and 'ρ'. The compressive strength (CS) of Al-SiC-Y2O3 composites increased while increasing the SiC. The higher compression strength (405MPa) was obtained for the Al-1wt% Y2O3-20wt% SiC- hybrid composites. The thermal conductivity (K) of Al-SiC-Y2O3 samples diminishes, as the hard SiC particles are gradually added. Furthermore, it was observed that accumulative the wt% of SiC in the aluminium metal matrix (AMMC) results in a novel material with a decreased wear rate. The better properties was achieved for the samples contain 20wt% of SiC content in Al-1wt% Y2O3 matrix.