What is Silicon Nitride?

What is Silicon Nitride?
Silicon nitride is an inorganic substance with the chemical formula Si3N4. It is an important structural ceramic material with high hardness, inherent lubricity, and wear resistance. It is an atomic crystal; it is resistant to oxidation at high temperatures. Moreover, it can resist the impact of cold and heat. It will not break when heated to over 1000℃ in the air, and then rapidly cooled and heated again. It is precisely because of the excellent characteristics of silicon nitride ceramics that people often use it to manufacture bearings, turbine blades, mechanical seal rings, permanent molds, and other mechanical components. If silicon nitride ceramics, which are resistant to high temperatures and difficult to transfer heat, are used to make the heating surfaces of engine parts, not only can the quality of the diesel engine be improved, fuel savings and thermal efficiency can be improved. China, the United States, Japan. and other countries have developed such diesel engines.
Silicon Nitride Physical properties
The relative molecular mass of Silicon nitride is 140.28. It is gray, white, or off-white. Silicon nitride is a high-temperature insoluble compound, has no melting point, and has strong resistance to high-temperature creep. The load softening point of reactive sintered silicon nitride without a binder is above 1800°C. Silicon nitride crystals are hexahedral. The density of Si3N4 prepared by the reaction sintering method is 1.8~2.7g/cm3, and the density of Si3N4 prepared by the hot pressing method is 3.12~3.22g/cm3. The Mohs hardness is 9~9.5, the Vickers hardness is about 2200, and the microhardness is 32630MPa. The melting point is 1900°C (under pressure). It usually decomposes at about 1900°C under normal pressure. The 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). Its linear expansion coefficient is 2.8~3.2×10-6/℃ (20~1000℃). Insoluble in water. He is soluble in hydrofluoric acid. The temperature at which oxidation starts in the air is 1300~1400°C. The specific volume resistance is 1.4×105 ·m at 20°C and 4×108 ·m at 500°C. The modulus of elasticity is 28420~46060MPa. The compressive strength is 490MPa (reaction sintered). Silicon nitride reacts with dicalcium dinitride at 1285°C to form calcium dinitrogen silicide, and at 600°C, it reduces transition metals and releases nitrogen oxides. The bending strength is 147MPa. Silicon nitride can be made by heating silicon powder in nitrogen or reacting silicon halide with ammonia. The resistivity is 10^15-10^16Ω.cm. Silicon nitride can be used as a high-temperature ceramic raw material.
Silicon Nitride applications
Manufacturing structure: such as metallurgy, machinery, aviation, aerospace.
Surface treatment of metals and other materials: such as molds, cutting tools, turbine blades.
Composites: such as metal, ceramic and graphite composite, rubber, plastic
Colorless, transparent self-lubricating wear nanoparticle membrane for mobile phones;
Advanced surface protection such as a car;
Jack joint;
Ball valve and part;
Corrosion-resistant turbine;
Metallurgical, aviation, chemical, energy, and machinery industry make parts such as bead/roller bearings, sleeves, valves, and other wear;
Making cutting tools, molds, cylindrical wall coating, turbine rotors, and blades;
Manufacturing composite materials such as ceramic, graphite, rubber, metal, adhesive, etc.
Nozzle, rocket and missile spray pipe.
Silicon Nitride  Supplier
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years of experience in providing super high-quality chemicals and Nanomaterials. Currently, our company has successfully developed a series of materials. Silicon Nitride produced by our company is of high purity and good quality. Send us an email or click on the needed products to send an inquiry.
 
 
 
 
 

Inquery us

Our Latest Products

Nitinol Nickel Titanium Ni-Ti Alloy Powder

Item No.: Tr-nitinol Nitinol Titanium powder is a shape memory alloy, which is a special alloy that can automatically restore its plastic deformation to its original shape at a certain temperature and has good plasticity.Purity:99.9%Particle…

Titanium Silicide TiSi2 Powder CAS 12039-83-7

Item No.: Tr-TiSi2 Titanium silicide is known as titanium disilicide, its chemical formula TiSi2 powder. Titanium silicide is a chemical substance with a molecular weight of 116.1333.Purity: 99%Particle Size: 5-10um…

TR01 525 grade white cement

TR01 525 white cement is a green and environmentally friendly product with high strength and no radioactivity in the early stage. The product has high whiteness, high strength, low alkalinity, good stability, and bright and bright color.…

0086-0379-64280201 brad@ihpa.net skype whatsapp