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Ultrafine Si3N4 Powder
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Shape: Lump Particles Powder
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Chemical Composition:Si3N4、Si、N、Fe
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Size:100mesh,200mesh,325mesh, 10-50mm .etc
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Package: Ton bag or customized according to customer requirements
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Product Introduction
The bonding force between nitrogen atoms and silicon atoms in the Ultrafine Si3N4 powder structure is very strong. As a high-temperature structural ceramic, it has high strength, high-temperature thermal stability, thermal shock resistance, chemical stability, oxidation resistance, good electrical insulation and hardness. It is known as the "all-around champion" among ceramic materials. It is precisely because silicon nitride ceramics have such excellent properties that people often use it to manufacture mechanical components such as bearings, turbine blades, mechanical sealing rings, and permanent molds.
chemical composition
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Model |
SPECIFICATION |
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|
SI3N4 |
Si(min) |
N |
Fe |
|
|
SI3N4 97 |
90-97% |
58-60% |
36-39% |
12-18% |
|
SI3N4 90 |
85-90% |
54-58% |
34-36% |
12-18% |
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SI3N4 80 |
75～80% |
47～51% |
30～33% |
12-18% |
|
SI3N4 75 |
70～75% |
49～52% |
28～30% |
12-18% |
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Size :100mesh, 200mesh, 300mesh, 325mesh or as customers' requirements. |
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Performance of Ultrafine Si3N4 powder
Stable chemical properties
Strong corrosion resistance, almost resistant to all inorganic acids (except HF, reaction equation: Si3N4+16HF═3SiF4↑+4NH4F) and NaOH solutions with a concentration of less than 30%, and can also withstand the erosion of many organic substances, and can withstand strong radiation.
Good thermal stability
Small thermal expansion coefficient, good thermal conductivity, and good thermal shock resistance. It will not break even if it is heated to above 1000 ℃ in air, cooled rapidly, and then heated rapidly.
High temperature oxidation resistance
Not oxidized below 1200℃, protective film generated at 1200-1600℃ can prevent further oxidation.
High temperature strength
High mechanical strength, hardness close to corundum, second only to diamond, cubic boron nitride, boron carbide, silicon carbide, mechanical impact resistance.
Small friction coefficient
self-lubricating, wear-resistant.
Applications of Ultrafine Si3N4 powder include
1
Mainly used for making high-performance silicon nitride ceramic structural parts, silicon nitride ceramic briquettes, silicon nitride targets, bearings, cutting tools, gears, etc.
2
Important materials for thermal equipment components, can be made into crucibles, heating element fixtures, muffle furnaces, thermocouple temperature protection sleeves, etc. Support parts for heat treatment of metal parts, turbojet engine parts. Thermal engine parts, gas turbine parts, etc.
3
Silicon nitride ceramics have a small friction coefficient, self-lubricating properties, high strength, small thermal expansion coefficient, and small volume change due to temperature. They can effectively prevent balls/seal rings from getting stuck and can be made into bearing balls and mechanical seal rings. Silicon nitride has high strength and can be used in bearing manufacturing and can withstand harsh working environments.
4
General industrial parts: wear-resistant parts, high-temperature insulation parts, heat-resistant containers for sintering plates, heat-resistant fixtures, etc.
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