What's the role of Boron nitride?

Physical and chemical properties of Boron nitride

1. Material properties

CBN is usually a black, brown, or dark red crystal with a sphalerite structure and good thermal conductivity. Second, only to diamond in hardness, it is a superhard material, often used as tool material and abrasive.

Boron nitride has chemical resistance properties and is not attacked by inorganic acids and water. The boron-nitrogen bond is broken in hot concentrated alkali. It begins to oxidize in the air at 1200°C. It begins to decompose at about 2700°C in a vacuum. Slightly soluble in hot acid, insoluble in cold water, relative density 2.29. The compressive strength is 170MPa. The maximum operating temperature is 900°C in an oxidizing atmosphere, and up to 2800°C in an inactive reducing atmosphere, but the lubricating performance is poor at room temperature. Most of the properties of boron nitride are better than carbon materials. For hexagonal boron nitride: very 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 Transparent to infrared rays.

2. material structure

Boron nitride hexagonal crystal system, the most common graphite lattice, also has amorphous deformation, in addition to hexagonal crystal form, boron nitride has other crystal forms, including rhombohedral boron nitride (r-BN), cubic Boron nitride (c-BN), wurtzite boron nitride (w-BN). People have even found two-dimensional boron nitride crystals like graphene.

What is Boron nitride used for?

1. Release agent for metal forming and lubricant for metal wire drawing.

2. Special electrolysis and resistance materials in a high-temperature state.

3. High-temperature solid lubricants, extrusion anti-wear additives, additives for the production of ceramic composite materials, refractory materials, and anti-oxidation additives, especially in the case of anti-corrosion of molten metals, heat-enhancing additives, and high-temperature-resistant insulating materials.

4. Heat-sealing desiccant for transistors and additives for polymers such as plastic resins.

5. Boron nitride products pressed into various shapes can be used as high-temperature, high-pressure, insulation, and heat dissipation components.

6. Heat shielding materials in aerospace.

7. With the participation of a catalyst, it can be transformed into cubic boron nitride as hard as a diamond after high temperature and high-pressure treatment.

The manufacturing method of Boron nitride

1. high temperature and high-pressure synthesis

In 1957 Wentorf synthesized cubic BN for the first time. When the temperature is close to or higher than 1700°C and the minimum pressure is 11-12GPa, it will directly transform from pure hexagonal boron nitride (HBN) to cubic boron nitride (CBN). It was subsequently found that the use of catalysts can greatly reduce the transition temperature and pressure. Commonly used catalysts are alkali and alkaline earth metals, alkali and alkaline earth nitrides, alkaline earth fluorinated nitrides, ammonium borate, and inorganic fluorides. Among them, ammonium borate as the catalyst requires the lowest temperature and pressure. The required pressure is 5GPa at 1500°C, and the temperature range is 600-700°C when the pressure is 6GPa. It can be seen that although adding a catalyst can greatly reduce the transition temperature and pressure, the required temperature and pressure are still relatively high. Therefore, the equipment for its preparation is complicated and the cost is high, and its industrial application is limited.

2. Chemical Vapor Synthesis

The experimental device is generally composed of a heat-resistant quartz tube and a heating device. The substrate can be heated by a heating furnace (hot wall CVD) or by high-frequency induction heating (cold wall CVD). The reaction gas decomposes on the surface of the high-temperature substrate, and at the same time, a chemical reaction occurs to deposit and form a film. The reaction gas is a mixed gas of BCl3 or B2H4 and NH3.

Price of Boron nitride

Particle size and purity will affect the product's price, and the purchase volume can also affect the cost of particle size. A large amount of large amount will be lower. The price of particle size can be found on our company's official website.

Boron nitride supplier

Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Inwin-style, 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 Zinc sulfide, nitride powder, Zinc sulfide powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective Boron nitride, you are welcome to contact us or inquire at any time.

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