Silicon nitride (Si3N4) is hard, solid substance, that can be obtained by direct reaction between silicon and nitrogen in high temperatures. Silicon nitride is main component in silicon nitride ceramics. Silicon nitride ceramics have relatively good shock resistance, compared to other ceramics. General Name, Symbol, Number silicon, Si, 14 Chemical series metalloids Group, Period, Block 14, 3, p Appearance dark gray, bluish tinge Atomic mass 28. ... General Name, Symbol, Number nitrogen, N, 7 Chemical series nonmetals Group, Period, Block 15, 2, p Appearance colorless Atomic mass 14. ...
Reaction bonded siliconnitride is made by direct nitridation of a compacted silicon powder, and because of the difficulty of ensuring complete reaction, it is hard to achieve a high component density.
Small dense sintered siliconnitride components are used in both automobile and truck engines for applications where stresses and temperatures are relatively low and the consequence of failure is not catastrophic.
Siliconnitride based cutting tools are now used in considerable numbers to machine cast iron by the automotive industry and nickel superalloys by the aero industries.
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