What is Boron nitride? Boron nitride is a crystal composed of nitrogen atoms and boron atoms. The chemical composition is 43.6% boron and 56.4% nitrogen, with four different variants: hexagonal boron nitride (HBN), rhombohedral boron nitride (RBN), cubic boron nitride (CBN) and wurtzite boron nitride (WBN).
Hexagonal boron nitride is also called white graphite. Nitrogen and boron in hexagonal boron nitride also form a hexagonal network layer, which overlaps each other to form a crystal. Physical and chemical properties of Boron nitride powder Boron nitride has chemical corrosion resistance and is not attacked by inorganic acid and water. The boron-nitrogen bond is broken in hot, concentrated alkali. Oxidation begins in the air above 200℃. It begins to decompose at about 2700℃ in a vacuum. Slightly soluble in hot acid, insoluble in cold water, with a relative density of 2.29. Compressive strength is 170MPa. The highest service temperature is 900℃ in an oxidizing atmosphere, but it can reach 2800℃ in an inactive reducing atmosphere, but the lubrication performance is poor at room temperature. Most properties of boron nitride are better than those of carbon materials. For hexagonal boron nitride: low friction coefficient, good high-temperature stability, good thermal shock resistance, high strength, high thermal conductivity, low expansion coefficient, high resistivity, corrosion resistance, microwave or infrared transmission. 1. High heat resistance: sublimation at 3000℃, its strength at 1800℃ is twice that of room temperature, and it will not break after air cooling at 1500℃ to room temperature for dozens of times, and it will not soften at 2800℃ in inert gas. 2. High thermal conductivity: The hot-pressed product is 33W/M.K. Like pure iron, it has the highest thermal conductivity among ceramic materials above 530℃. 3. Low thermal expansion coefficient: The expansion coefficient of 2×10-6 is second only to that of Shi Ying glass, which is the smallest among ceramics. In addition, it has high thermal conductivity, so it has good thermal shock resistance. 4. Excellent electrical properties: Good insulation at high temperatures, 1014 Ω-cm at 25℃ and 103Ω-cm at 2000℃. It is the best high-temperature insulation material in ceramics, with a breakdown voltage of 3KV/MV, a low dielectric loss of 2.5×10-4 at 108HZ, a dielectric constant of 4, and transparent to microwaves and infrared rays. 5. Good corrosion resistance: It does not react with common metals (iron, copper, aluminum, lead, etc.), rare earth metals, precious metals, semiconductor materials (germanium, silicon, potassium arsenide), glass, molten salt (crystal stone, fluoride, slag), inorganic acids and alkali. 6. Low friction coefficient: U is 0.16, which does not increase at high temperatures. Compared with molybdenum disulfide and graphite, it has high-temperature resistance and can be used to 900℃ in an oxidizing atmosphere and 2000℃ in a vacuum. 7. High purity and high B: its impurity content is less than 10PPM, while its B content is more than 43.6%. 8. Machinability: Its hardness is Mohs 2, so it can be processed into parts with high precision by general machining methods. Uses of Boron nitride powder Boron nitride has many excellent properties and is widely used in insulators of high-voltage and high-frequency electricity and plasma arc, coatings of high-temperature resistant frames for automatic welding, materials of high-frequency induction furnaces, a solid admixture of semiconductors, structural materials of atomic reactors, packaging materials for preventing neutron radiation, transmission windows of radars, media of radar antennas and compositions of rocket engines, etc. Because of its excellent lubricating performance, it is used as a high-temperature lubricant and a release agent for various models. Price of Boron nitride powder Boron nitride powder particle size and purity will affect the product's price, and the purchase volume can also affect the cost of Boron nitride powder. A large amount of large amount will be lower. The price of Boron nitride powder can be found on our company's official website. Boron nitride powder supplier Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including Boron nitride powder, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective Boron nitride powder, you are welcome to contact us or inquire any time.
