Crystal structure and properties of Silicon nitride


The longer stacking sequence results in the α-phase having higher hardness than the β-phase. However, the α-phase is chemically unstable compared with the β-phase. When a liquid phase is present at high temperatures, the α-phase always transforms into the β-phase. Therefore, β-Si3N4 is the major form used in Si3N4 ceramics. Abnormal grain growth may occur in doped β-Si3N4, whereby abnormally large elongated grains form in a matrix of finer equiaxed grains and can serve as a technique to enhance fracture toughness in this material by crack bridging. Abnormal grain growth in doped silicon nitride arises due to additive-enhanced diffusion, resulting in composite microstructures, which can also be considered "in-situ composites" or "self-reinforced materials. Specifically, polycarbosilane can be readily converted to an amorphous form of silicon carbonitride-based material upon pyrolysis, with valuable implications in the processing of silicon nitride materials through processing techniques more commonly used for polymers. One of the major applications of sintered silicon nitride is in the automobile industry as a material for engine parts. Those include in diesel engines, glowplugs for faster start-up; precombustion chambers (swirl chambers) for lower emissions, faster start-up, and lower noise; turbochargers for reduced engine lag and emissions. In spark-ignition engines, silicon nitride is used for rocker arm pads for lower wear, turbocharger turbines for lower inertia and less engine lag, and exhaust gas control valves for increased acceleration. As examples of production levels, an estimated more than 300,000 sintered silicon nitride turbochargers are made annually. If you are looking for high quality, high purity, and cost-effective Silicon nitride, or if you require the latest price, please email contact mis-asia.

Inquiry us

Our Latest Products

CAS No. 557-05-1 40% Water-based Zinc Stearate Zinc Stearate Emulsion

Product DescriptionProduct Description Description of zinc stearate emulsionZinc stearate emulsion is easy to disperse in water, has ultra-fineness, good dispersion compatibility. Zinc stearate emulsion has the characteristics of lubricating and deli...…

China factory cheapest price lightweight concrete wall panel making machine large hydraulic cement foaming machine equipment

Product performance of TR-40 Cement Foaming Machine1. The shell is made of high-strength precision thickened steel plate, painted twice, which is durable.2. The slurry output is uniform and stable, the density of the foam concrete finished product i...…

TR30 huge CLC concrete foam generator cement foaming machine Integrated machine for pouring light steel keel and structural wall

Company Profile Luoyang Tongrun Info Technology Co., Ltd. is committed to technology development, applications of nanotechnology and new material industries, with professional experience in the nano-technology research and developmen...…

0086-0379-64280201 skype whatsapp