Overview of silicon nitride Si3N4 powder

Overview of silicon nitride Si3N4 powder

Silicon nitride Si3N4 powder is an inorganic substance with the chemical formula Si3N4. Si3N4 is an important structural ceramic material with high hardness, inherent lubricity, wear resistance, atomic crystallinity and high temperature oxidation resistance.

Product characteristics of silicon nitride Si3N4 powder

low density

High temperature strength

Excellent thermal shock resistance

Excellent wear resistance

good fracture toughness

Mechanical fatigue and creep resistance

good oxidation resistance

Silicon Nitride Si3N4 Powder Specifications

Product Name: Silicon Nitride

Purity: 99%

Particle size: 0.5um-1um (α phase)

How is silicon nitride Si3N4 powder produced?

Hexagonal β-Si3N4 can be directly carried out with silicon nitride and nitrogen can be carried out at 100-1400 °C.

SiCL4(L)+6NH3(g)→Si(NH)2(S)+4NH4Cl(S) at 0℃

3 Si(NH)2(S)→Si3N4(S)+N2(g)+3H2(g) at 1000℃

Or thermal reduction reaction with carbon under nitrogen atmosphere at 1400-1450 ℃ under nitrogen atmosphere:

3SiO2(S)+6C(S)+2N2(g)→Si3N4(S)+6CO(g)

However, if the silicon raw material used is of high purity, it will cause silicon nitride to contain impurities such as silicate and iron. The silicon nitride synthesized by the decomposition of diamine is amorphous and needs to be further annealed at 1400-1500 ℃ in nitrogen to be converted into crystalline powder. Only the decomposition of diamine is important. Silicon nitride is commercially produced by the nitridation process. Carbothermal reduction reaction is the simplest method for producing silicon nitride, and it is also the most economical and efficient method for manufacturing silicon powder in industry.

Electronic grade silicon nitride films using chemical vapor deposition or plasma enhanced chemical vapor deposition techniques:

3 SiH4 (G) + 4 NH3 (g) → Si3N4 (S) + 12 H2 (g)

3 SiCL4 (G) + 4 NH3 (g) → Si3N4 (S) + 12 HCl (g)

3 SiCL2H2 (G) + 4 NH3 (g) → Si3N4 (S) + 6 HCl (g) + 6 H2 (g)

Application of silicon nitride Si3N4 powder

1) Manufacturing structural devices: metallurgy, machinery, aviation, aerospace, etc.

2) Surface treatment of metals and other materials: such as molds, tools, turbine blades.

3) Composite materials: such as metal, ceramic and graphite composite materials, rubber, plastics.

4) Colorless, transparent, self-lubricating and wear-resistant nanoparticle film for advanced surface protection such as mobile phones and automobiles.

5) Ball bearings.

6) Ball valve and parts.

7) Corrosion resistant turbine.

Other applications of silicon nitride Si3N4 powder

Silicon nitride Si3N4 powder is used as high-grade refractory material. For example, SI3N4-SIC refractory material and sic are used in blast furnace body and other parts, and SI3N4-BN material is used in combination with BN for horizontal continuous casting separation ring. The continuous casting separation ring is made of fine-structure ceramic material with uniform structure and high mechanical strength. Si3N4 has good thermal shock resistance, will not be wetted by molten steel, and meets the requirements of continuous casting process

Silicon nitride Si3N4 powder ceramic material has excellent properties of high thermal stability, strong oxidation resistance, and high product dimensional accuracy. Since silicon nitride is a covalent compound, it has high bonding strength and can form an oxide protective film in the air. Si3N4 also has good chemical stability and will not be oxidized below 1200 °C. The protective film formed at 1200~1600℃ can prevent further oxidation and will not be infiltrated by various molten metals or alloys such as aluminum, lead, tin, silver, brass, and nickel. or corrosion, but Si3N4 can be corroded by molten magnesium, nichrome, stainless steel and other melts.

Silicon nitride Si3N4 powder ceramic materials can be used in high temperature engineering parts, advanced refractory materials in metallurgical industry, corrosion-resistant parts and seals in chemical industry, tools and cutting tools in machining industry, etc. Because silicon nitride can form strong bonds with silicon carbide, aluminum oxide, thorium dioxide, boron nitride, etc., Si3N4 can be used as a bonding material for modification in different proportions.

In addition, silicon nitride can also be applied to solar cells. After the silicon nitride film is coated by PECVD method, Si3N4 can not only act as an anti-reflection film to reduce the reflection of incident light, but also in the deposition process of the silicon nitride film, the hydrogen atoms of the reaction product enter the silicon nitride film and the silicon wafer, passivating Defects. The ratio of the number of silicon nitride to silicon atoms here is not strictly 4:3, but depends on the process conditions within a certain range. Internal fluctuations, the physical properties of the films corresponding to different atomic ratios are different.

The price of silicon nitride Si3N4 powder

The price of silicon nitride Si3N4 powder will change randomly with the production cost, transportation cost, international situation, exchange rate and the supply and demand of the silicon nitride Si3N4 powder market. Tanki New Materials Co., Ltd. aims to help industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full range of customized services. If you are looking for Silicon Nitride Si3N4 Powder, please feel free to send an inquiry to get the latest price of Silicon Nitride Si3N4 Powder.

Silicon Nitride Si3N4 Powder Supplier

As a global supplier of silicon nitride Si3N4 powder, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (titanium nitride, silicon nitride, titanium nitride, etc.) high-purity targets, functional ceramics and structural devices, and provides OEM services.

Chemical Composition of Silicon Nitride Si3N4 Powder