Function:

1. High-temperature solid lubricants, extrusion anti-wear additives, additives for the production of ceramic composite materials, refractory materials and antioxidant additives, especially when resisting molten metal corrosion. , heat-enhancing additives, high-temperature-resistant insulating materials.

2. Release agent for metal molding and lubricant for metal drawing. Special electrolytic and resistive materials in high temperature conditions.

3. High-temperature solid lubricants, extrusion anti-wear additives, additives for the production of ceramic composite materials, refractory materials and antioxidant additives, especially in cases of resistance to molten metal corrosion, thermal enhancement additives, high-temperature-resistant insulation Material.

4. Various laser anti-counterfeiting aluminum plating, trademark hot stamping materials, various cigarette labels, beer labels, packaging boxes, cigarette packaging boxes, etc.

5. Cosmetics are used as fillers in lipsticks, which are non-toxic, lubricating and shiny.

6. Boron nitride products pressed into various shapes can be used as high temperature, high voltage, insulation and heat dissipation components. It can also be used as heat shielding material in aerospace.

7. Superhard materials made from boron nitride can be made into high-speed cutting tools and drill bits for geological exploration and oil drilling.

Extended information

Manufacturing

Boron nitride can be produced from boron trichloride through nitridation or ammonia decomposition. Hexagonal boron nitride parts can be made by heating, pressing and subsequent machining. Because its hardness is comparable to graphite, the processing cost is not high. These parts are made from boron nitride powder, with boron oxide as the sintering agent.

Boron nitride thin films can be formed by chemical vapor deposition of boron trichloride and nitrogen prototypes. Industrial manufacturing is based on two chemical reactions: molten boric acid with ammonia, boric acid or alkaline borides with urea, guanidine, melamine or other appropriate organic nitrogen compounds in nitrogen. Making ultra-fine boron nitride lubricants and toners requires burning boron powder in nitrogen at a high temperature of 5500°C.

The structure of cubic boron nitride is similar to diamond and extremely hard. The microhardness is HV72000~98000Mpa, which is only lower than diamond. Like diamond, cubic boron nitride is an insulator but an excellent conductor of heat. Also called c-BN, β-BN, or z-BN (named after the crystal structure of zinc blende), it is a widely used industrial drilling and grinding tool.

Because it is insoluble in iron, nickel and other high-temperature alloys, CBN is suitable for processing ferrous metals such as iron and nickel. Diamonds will chemically react with these substances and cause rapid wear of cutting tools.

Polycrystalline c-BN drilling and grinding tools are mostly used in mechanical steel, while diamond drilling and grinding tools are mostly used in aluminum alloys, pottery and glass. Like diamond, cubic boron nitride has high heat transfer properties due to its phonons. In contact with oxygen at high temperatures, boron nitride forms a passivating layer of boron oxide. Boron nitride bonds well to metals due to the formation of alternating layers of boron or nitrogen alloys.

Baidu Encyclopedia-Boron Nitride