Excellent properties and uses of boron nitride products

1. The boron nitride product is excellent in high temperature resistance and insulation, and can be used as an electrical insulating material at a high temperature, and has excellent thermal shock resistance.

 

2, in the electronics industry, the use of its thermal conductivity and penetration of microwave radiation, used as a radar transmission window.

 

3. The boron nitride product has high melting point, small thermal expansion coefficient and stable performance to almost all molten metals, and can be used as a high-temperature metal smelting crucible, heat-resistant material, and used as a heat sink and a heat conductive material.

 

4. The thermal conductivity of hot-pressed hexagonal boron nitride is comparable to that of stainless steel, and it does not change much with temperature. The thermal conductivity below 900 °C is better than BeO. Hexagonal boron nitride has a low thermal expansion coefficient and a low elastic modulus, so it has excellent thermal stability and can be used under repeated rapid cooling conditions from 1500 ° C to room temperature.

 

5. Boron nitride has good corrosion resistance to acid, alkali and glass slag, and does not affect most molten metals such as Fe, Al, Ti, Cu and Si, as well as gallium arsenide, cryolite and glass melt. Wetting does not react, so it can be used as a crucible, vessel, pipe, transfer pump and other components for smelting non-ferrous metals, precious metals and rare metals. It can also be used as a boron single crystal melting vessel, a glass forming mold, and a horizontal continuous casting separation ring. Thermocouple protection tubes, etc., can also be used to manufacture semiconductor materials such as arsenic zinc, gallium phosphide, and bismuth phosphide, heat sinks for various semiconductor packages, and P-type diffusion sources for semiconductors and integrated circuits.

 

6. After replacing the conventional alumina protection tube with a boron nitride thermocouple protection tube, the thermal conductivity is improved, the temperature control accuracy is improved, the power saving effect of the furnace is remarkable, and the product qualification rate is improved, which brings the enterprise Better economic benefits.

 

7. Boron nitride is a good conductor of heat and an insulator of electricity. Its breakdown voltage at high temperature is 4-5 times that of alumina, its dielectric constant is one-half of that of alumina, and it is still an electrical insulator at 2000 °C, which can be used as an ultra-high temperature insulation material. Boron nitride is transparent to microwaves and infrared rays and can be used as a window through infrared and microwaves (such as radar windows).

 

8. Boron nitride has strong seed absorption capacity due to the presence of boron atoms. It can be used as a shielding material for atomic reactors in the atomic energy industry in combination with various plastics and graphite.

 

9. Boron nitride has stable performance under ultra-high pressure and can be used as a container for pressure transmitting materials. Boron nitride is the lightest ceramic material and is very advantageous for use as a high temperature structural material for aircraft and spacecraft.