What is Silicon Nitride

Silicon Nitride (Si3N4) is a chemical compound of Silicon and Nitrogen.
Silicon nitride (Si3N4) exceeds other materials in thermal shock resistance.
This material does not deteriorate at high temperature, therefore it's appropriate for automotive engine and parts for gas turbine, including turbocharger rotor, glow plug of diesel engine and hot plug.
It is expected that the field range this material can be applied to will widely expand.

The element nitrogen was discovered by a Scottish physician Daniel Rutherford in 1772. Nitrogen occurs in all living organisms.
It is a constituent element of amino acids and thus of proteins, and of nucleic acids (DNA and RNA).
It resides in the chemical structure of almost all neurotransmitters, and is a defining component of alkaloids, biological molecules produced by many organisms.

Nitrogen is a chemical element that has the symbol N, atomic number of 7 and atomic mass 14.00674 u.
Elemental nitrogen is a colorless, odorless, tasteless and mostly inert diatomic gas at standard conditions, constituting 78% by volume of Earth's atmosphere.

Many industrially important compounds, such as ammonia, nitric acid, organic nitrates (propellants and explosives), and cyanides, contain nitrogen.
The extremely strong bond in elemental nitrogen dominates nitrogen chemistry, causing difficulty for both organisms and industry in breaking the bond to convert the N2 into useful compounds, but releasing large amounts of often useful energy, when these compounds burn, explode, or decay back into nitrogen gas.

It is produced by heat-reaction in the atmosphere of nitrogen after molding metalic silicon powder into some speified shape.
As there is almost no variation in size of articles, after-heat and before-heat, by heat reaction.
It is possible to get high precision articles at economical cost, subject to suitable technique of nitridation.
High purity silicon nitride articles are very strong, hard, and superior to heat-resistance, heat-shock resistance, and chemical stability, so draw much interest as construction material which is used under the more severe conditions beyond the performances of conventional ceramic and metallic materials.
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Chemical Composition

Si3N4Free SiFeAlCaC
97.0`99.00.2`0.50.3`0.80.05`0.20.05`0.20.1`0.2

Crystal Construction

Silicon nitride is matrix coexisiting with Si3N4 (hexagonal crystal) and Si3N4(hexagonal crystal) Si3N4 is transformed to slowly Si3N4@at temperature over 1,400C.
Silicon nitride articles sintered by nitridation consisits of Si3N4 grains binded strongly each other.
A gap between grains is filled up by Si3N4 whisker.
So, it has a low permeability for itfs high porosity, and high creep strength at high temperature because of no glass phase.


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