The purchasing pace at the demand end of the international thermal coal market continues to slow down and the international thermal coal price continues to decline. Prices for thermal coal at major international ports continued to fall last week as buyers in Europe slowed in recent days for April, coupled with weaker-than-expected import demand from End users in China. According to China Coal Market net monitoring: Australia Newcastle port thermal coal price index was 253 USD/ton, compared with 309.02 USD/ton, down 56.02 USD/ton, down 18.13%. South Africa's Port Richards thermal coal price Index was $264.5 / mt, down the US $62.72 / mt or 19.17% from US $327.22 / mt. The European ARA Tri-port thermal coal price Index was $281.8 / ton. Does the price of thermal coal in major international ports continue to decline to affect the price of the Silicon Nitride, Silicon Nitride Overview, Silicon Nitride Applications, Silicon Nitride Suppliers, Silicon Nitride Price?
Overview of Silicon Nitride Si3N4
Silicon nitride is a compound of silicon and nitrogen. Si3N4 is the most thermodynamically stable in silicon nitride. It is a white, high melting solid, relatively chemically inert, attacked by dilute HF and hot H2SO4. It works very hard (MoHS is 8.5) and has high thermal stability.
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:
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.
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
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