Silicon Nitride (Si3N4) Micron Powder
Silicon nitride is a chemical compound of the elements silicon and nitrogen. Si3N4 is the most thermodynamically stable of the silicon nitrides. It is a white, high-melting-point solid that is relatively chemically inert. Its melting point is approximately 2830℃ and has a density of 3.16 g/cm3. Silicon nitride has better high temperature capabilities than most metals combining retention of high strength and creep resistance with oxidation resistance. In addition, its low thermal expansion coefficient gives good thermal shock resistance compared with most ceramic materials. The material is used currently in niche market applications for example in reciprocating engine components and turbochargers, bearings, metal cutting and shaping tools and hot metal handling. Silicon nitride powder has exceptional strength and creep resistance at high temperatures and is very resistant to thermal shock, making it an important high temperature structural ceramic. There is also interest in silicon nitride as an electronic thin film material in the role of an optical coating, insulating layer, or diffusion barrier.