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What are the advantages of reaction-sintered silicon carbide?
Release time:
2022-10-08
Reaction-sintered silicon carbide What are the advantages of this approach?
Silicon nitride is an exceptionally corrosion-resistant material that we can use to manufacture products such as ceramics. When producing ceramics using silicon nitride, there are various reaction-sintering methods for silicon carbide. Depending on the specific production and processing environment, one can choose the most suitable sintering method to enhance the efficiency of reaction-sintered silicon carbide.
Reaction-sintered silicon carbide and continuous high-temperature isostatic pressing can produce silicon carbide ceramics with relatively high density; the sintering temperature ranges between 150 and 210 degrees Celsius. Consequently, silicon nitride lining manufacturers have found it difficult to produce complex products at low cost.
Reaction-sintered silicon carbide The process involves using small billets composed of SiC and flake graphite, which are heated to induce a reaction with liquid Si or a liquid-phase Si to form SiC. This method enables the production of complex products with relatively low sintering temperatures (140–1600°C). However, 8% to 20% of glassy silicon still remains on the green body. Consequently, silicon nitride lining manufacturers believe that this residual glassy silicon limits the high-temperature physical properties of silicon nitride as well as its performance in strong alkalis and strong acids.
Silicon carbide ceramics not only exhibit high compressive strength, corrosion resistance, wear resistance, and frictional resistance at room temperature, but also possess excellent sustained high-temperature strength and creep resistance.
Silicon carbide ceramics exhibit high ductility and low crack propagation. The incorporation of chemical fibers, whiskers, and particles can enhance the toughness and compressive strength of SiC ceramics.
Reaction-sintered boron carbide and reaction-sintered silicon carbide
Reaction-sintered silicon carbide is a high-strength material that ranks just below diamond and boron nitride. It is a chemically bonded compound with excellent properties, including low density, high toughness, high refractive index, and outstanding corrosion resistance. It finds wide applications in fields such as national defense and security, mechanical equipment, aerospace, and organic chemical engineering. Silicon nitride is characterized by its low density, high hardness, high tensile strength, corrosion resistance, heat resistance, and cost-effectiveness in ballistic protection. Both materials are key components of ceramic fiber panels used for bulletproof applications and hold great potential for further development in lightweight armor materials.
Reaction-sintered silicon carbide The chemical bond strength of the material is above 90%, while the chemical bond strength of silicon nitride is 88%. Due to the small interfacial tension between these two materials and their low molecular thermal diffusion coefficients within the internal structure, it is difficult to achieve multipolar sintering for either material. At present, the sintering methods used for these two materials are quite similar. Traditional sintering methods include pseudo-negative-pressure sintering, hot-press sintering, pressureless sintering, and reaction sintering, among others.
Due to the ionic bonding and fusion characteristics of structural ceramics, the average intermolecular spacing is large, and the material lacks sufficient plastic deformation capability, making it prone to fracture even from minor defects. The key to improving boron carbide and silicon nitride lies in controlling internal structural defects within the ceramic, relieving stress concentration, and enhancing the material's resistance to crack propagation.
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