Guotai Junan released a research report saying that under the background of carbon neutrality, the scarcity of coal mines is prominent, and the value of assets will continue to increase. The high point of capital expenditure in the coal industry appeared in 2012. Under the general direction of carbon neutrality, the overall investment in the industry has slowed down, and capital expenditure has gradually declined. From 2021 to now, the Energy Bureau of the National Development and Reform Commission has only newly approved 17.4 million tons of 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 |
| CAS No. | 12033-89-5 |
| Compound Formula | Si3N4 |
| Molecular Weight | 140.28 |
| Appearance | white to gray powder |
| Melting Point | 1900°C |
| Boiling Point | N/A |
| Density | 2.2-3.5g/cm3 |
| Solubility in H2O | insoluble |
| Exact Mass | 139.943 |
Silicon Nitride Si3N4 Powder CAS 12033-89-5
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
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Europe's immediate goal of reducing its dependence on Russian gas in response to the conflict with Ukraine presents a rare opportunity for the United States, the world's largest gas producer. America's LNG exporters have made a fortune this time. Investors are bullish on the future of natural gas, as evidenced by the recent record high share price of Energy company Chenier.
But the outlook for more than a dozen new LNG projects is highly uncertain as construction costs rise, US gas prices soar and climate policymakers seek to move away from a long-term reliance on fossil fuels. Even the most advanced projects can take years to become operational.
Currently, the total U.S. LNG Silicon Nitride powder are expected to continue to rise in the future.
