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 powder?
Introduction to Silicon Nitride Si3N4 Powder
Silicon nitride is a kind of inorganic substance, the chemical formula is Si3N4. The relative molecular mass is 140.28. Gray, white or off-white.
Physicochemical Properties of Silicon Nitride Si3N4 Powder
Si3N4 is a high-temperature insoluble compound. It has properties of high-temperature creep resistance. Hexagonal system. Crystals are hexahedral. The density of Si3N4 obtained by the reaction sintering method is 1.8-2.7 g/cm3, and the density of Si3N4 obtained by the hot-pressing method is 3.12-3.22 g/cm3. The Mohs hardness is 9~9.5, Vickers hardness is about 2200, and the microhardness is 32630MPa. The melting point is 1900℃ (under pressure). It usually decomposes at about 1900℃ at atmospheric pressure. Specific heat capacity is 0.71J/(g·K). The heat of formation is -751.57kJ/mol. The thermal conductivity is (2-155) W/(m·K). The linear expansion coefficient is 2.8~3.2×10-6/℃(20~1000℃).
Insoluble in water. Soluble in hydrofluoric acid. The temperature at which oxidation begins in the air is 1300~1400℃. The specific volume resistance is 1.4×105 ·m at 20℃ and 4×108 ·m at 500℃. The elastic modulus is 28420~46060MPa. The compressive strength is 490MPa (reaction sintering). At 1285℃, it reacts with dicalcium diazide to form calcium diazide. At 600℃, the transition metal is reduced and nitrogen oxides are released. The bending strength is 147MPa. It can be made by heating silicon powder in nitrogen or reacting silicon halide with ammonia. The resistivity is between 10^15-10^16Ω.cm. It can be used as high-temperature ceramic material.
Except for hydrofluoric acid and hot phosphoric acid, silicon nitride does not react with other inorganic acids and has strong corrosion resistance.
|Silicon Nitride Si3N4 Powder Properties|
|Other Names||silicon (IV) nitride, α-Si3N4, SiN, trisilicon tetranitride, Si3N4 powder|
|Appearance||white to gray powder|
|Solubility in H2O||insoluble|
Applications of Silicon Nitride Si3N4 Powder
Silicon nitride ceramic material has the advantages of high thermal stability, high oxidation resistance, and high dimensional accuracy. Because the silicon nitride is the covalent compound with high bond strength, and it will form an oxide film in the air, it has good chemical stability. Silicon nitride is not oxidized below 1200℃, and a protective film can be formed at 1200~1600℃ to prevent it from further oxidation. Silicon nitride is not infiltrated or corroded by aluminum, lead, tin, silver, brass, nickel, and many other molten metals or alloys, but can be corroded by magnesium, nickel-chromium alloy, stainless steel, and other molten liquids.
Silicon nitride ceramic materials can be used in high-temperature engineering components, advanced refractory in the metallurgical industry, corrosion-resistant components and sealing components in the chemical industry, machining industry tools, and cutting tools.
Because silicon nitride can form a strong bond with silicon carbide, alumina, thorium dioxide, boron nitride, etc., it can be used as a bond material to modify with different proportions.
In addition, silicon nitride can be used in solar cells. After the silicon nitride film is plated by the PECVD method, not only can it be used as an antireflection film to reduce the reflection of the incident light, but also, in the deposition process of a silicon nitride film, the hydrogen atom of the reaction product enters the silicon nitride film and silicon wafer, playing a role of passivation defect. The ratio of silicon nitride to silicon nitrogen atoms is not a strict 4:3, but fluctuates within a certain range according to different technological conditions. Different atomic ratios correspond to different physical properties of the film.
Also, it can be used in ultra-high temperature gas turbines, aircraft engines, electric furnaces, etc.
Main Supplier of Silicon Nitride Si3N4 Powder
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and Nanomaterials, including silicon powder, nitride powder, graphite powder, zinc sulfide, calcium nitride, 3D printing powder, etc.
If you are looking for high-quality silicon nitride Si3N4 powder, please feel free to contact us and send an inquiry. ([email protected])
China's non-manufacturing purchasing managers index for March was released by the China Federation of Logistics and Purchasing and the Service Industry Survey Center of the National Bureau of Statistics today. An index of business activity for the non-manufacturing sector as a whole fell below 50 percent.
China's non-manufacturing business activity index was 48.4%, down 3.2 percentage points from the previous month. The new orders index was 45.7 percent, down 1.9 percentage points from the previous month, indicating a significant slowdown in the growth of supply and demand in the non-manufacturing sector from the previous month. In terms of sectors, the business activity index and new order index of transportation, accommodation and catering, culture, sports and entertainment, and tourism-related industries all declined significantly from the previous month.
Then the Silicon Nitride powder of the market may be affected by significant changes, the price will also be volatile, if you want to know the latest news of the Silicon Nitride powder, welcome to contact us.
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