The Difference Between Hexagonal Boron Nitride and Cubic Noron Nitride
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Update time : 2022-01-27 10:26:32
The Difference Between Hexagonal Boron Nitride and Cubic Noron Nitride
Boron nitrideis 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), cubic boron nitride (CBN), rhombohedral boron nitride (RBN) and wurtzite nitrogen Boronide (WBN). Among them, hexagonal boron nitride and cubic boron nitride are more commonly used. Boron nitride is mainly used in refractory materials, semiconductor solid-phase doping sources, structural materials of atomic stacks, packaging materials against neutron radiation, rocket engine components, high-temperature lubricants and mold release agents. Fibers processed with boron nitride can be used as inorganic synthetic engineering materials and are widely used in aerospace and defense industries. CBN can also be used as deep well drill bits and high-speed cutting tools.
What is the difference between hexagonal boron nitride and cubic boron nitride?
Hexagonal Boron Nitride: Hexagonal boron nitride (similar to graphite, also known as graphite boron nitride, white graphite). Relative density 2.25. The Mohs hardness is about 2. It is a white powder that melts at about 3000°C under high pressure. Has good electrical insulation, thermal conductivity, corrosion resistance and good lubricity. It has good chemical stability and does not react with water, acid and alkali at room temperature. Reacts with hot concentrated or molten alkali and hot chlorine gas. Can withstand 2000 ℃ high temperature. Has a strong ability to withdraw electrons. It can be obtained by heating borax and ammonium chloride in a stream of ammonia. BN and graphite are isoelectronic bodies. It is known as white graphite, has a layered structure similar to graphite, has good lubricity, electrical insulation, thermal conductivity and chemical resistance, and has neutron absorption ability. Chemically stable and chemically inert to all molten metals, shaped products are easy to machine and have high moisture resistance. The melting point is 3000°C under nitrogen pressure, and it sublimates at 2500°C under atmospheric pressure. Its theoretical density is 2.29 grams per cubic centimeter. Mohs hardness of 2, anti-oxidation temperature of 900 ° C, high temperature resistance of 2000 ° C, the melting point of use in nitrogen and argon is 3000 ° C. It is a chemically inert material and is stable up to 2700°C under an argon atmosphere.
Cubic Boron Nitride: Cubic boron nitride (diamond type). For black or brown granular crystals. Relative density 3.48. Melting point 3000 ℃. The hardness is comparable to that of diamond. Stability at high temperature is better than diamond. Boron and nitrogen can be directly synthesized under high temperature and high pressure conditions. Boron nitride with cubic structure: the molecular formula is BN, its crystal structure is similar to that of diamond, and its hardness is slightly lower than that of diamond, which is HV72000-98000 MPa, and is often used as abrasive and tool material. In 1957, R.H. Wintorf of the United States first developed the cube. In 2013, Yanshan University successfully synthesized a new material of cubic boron nitride with nano-twin structure. This new material has a variety of excellent characteristics. Its hardness is higher than that of diamond single crystal, its toughness is better than that of commercial cemented carbide, and its oxidation resistance temperature is higher than that of cubic boron nitride single crystal itself. It is expected to become a new generation tool material in the steel material processing industry. Has broad application prospects.
The core difference between cubic boron nitride and hexagonal boron nitride is that the physical structure is different. The crystal form of cubic boron nitride is more pressure-resistant and wear-resistant, and is often used in cutting tools. The price is relatively low. , Selling at a low price, it is a concept of stealing. Although the main chemical composition of this kind of coating is also boron nitride, the actual non-stick effect of aluminum is not good. Another crystal form of boron nitride is hexagonal boron nitride. This crystal form of boron nitride has super lubricating function, high temperature resistance, and metal non-wetting. It is the preferred material for high temperature non-stick aluminum coatings, and the price is relatively expensive. The best non-stick aluminum effect on the market is mainly this boron nitride coating.
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