SILICON NITRIDE

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SILICON NITRIDE

时间：2017-10-11 14:45 点击量：

Basic Property:
Pure silicon nitride is non-acidification ceramic, which has excellent performance in high-heat machinery. It has excellent heat-resistance and wearable capability. There are two types: alpha and beta types. The alpha type is mainly used as powder material for moldings and the beta type is used as fillers to improve wearable resistance/thermal conductivity of resins, etc. The structure of silicon nitride is similar to diamond, and it can be heated to 1450-1550℃ in the air and 1750℃ in inert gases or the environment of deoxidization. If the temperature is higher, the decomposition is more severe. We can supply ultra fine powder whose average particle size ranges from sub-micron to coarse grain powder.
Feature:
Moldings using silicon nitride powder are light, having excellent strength at high temperature, toughness against breakage, and quite sensational characteristics such as wearability, resistance to corrosion and oxidation and thermal shock, etc. This is a material applied in components for automotive engines, electronics and industrial machinery, as well as in various types of composite materials, etc. It can be synthesized from the silicon powder heated to 1200-1450℃ in the atmosphere of ammonia, nitrogen and nitrogen-hydrogen or from the mixture of silicon dioxide and excessive carbon powder in the atmosphere of nitrogen at 1400℃.
Chemical composition:

Kinds of commodity		Silicon nitride （α-Si₃N₄）	Silicon nitride （β-Si₃N₄）
α, β content		α>92%	β>95%
Chemical composition (Wt.%)	N	>37.0	>37.0
	O	<1.5	<1.5
	C	<0.1	<0.1
	Fe	<0.2	<0.3
Physical property	Granularity (D₅₀)	<1um	<5-10um, 200 mesh
	Specific surface area (SSA)	>10m²/g	>3-5 m²/g
	Molecular weight	140.5	140.3
	Density (g/cm³)	3.2	3.14
	Expansion coefficient ×10^-6K^-1	2.8	2.8
	Resistance coefficient (Ω.cm)	10¹³	10¹³
	Micro hardness kg/mm²	3500	2800
	Grain size	It can be supplied and produced according to buyers’ requirements.

Use:
(1) Thermal engine components: Automotive engine components, gas turbine components, etc.
(2) Mechanical components: Cutting tools, bearings, etc.
(3) Corrosion resistance components: melted aluminum-related components, etc.
(4) General industrial components: wearable components, high temperature insulation components, heat resistant containers and tools, etc.
(5) Material for resin filling: wearable, thermal conductive filler, etc.
(6) Silicon nitride ceramic has been one of important materials for metal cutting tools, and it is being developed to apply to gas engine.
(7) The sintering silicon nitride can be made into pipe, crucible and nozzle, etc so that it can satisfy various special requirements.
The XRD patterns of the SHS-synthesized Si₃N₄ powders:
u α₁=72.3%(Fig. 8) u α₂=73.7%(Fig.9)

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