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The advantages of boron nitride
CBN is usually a black, brown, or dark red crystal with a sphalerite structure and good thermal conductivity.
Boron nitride has excellent thermal conductivity, hardness, and chemical stability, making it widely used in many fields. For example, boron nitride can be used to prepare high-performance ceramics, abrasives, and cutting tools. It can also be used as a semiconductor material for manufacturing electronic components and optical devices, etc.
Material characteristics
CBN is usually a black, brown, or dark red crystal with a sphalerite structure and good thermal conductivity. Hardness second only to diamond, it is a superhard material commonly used as a tool material and abrasive.
Boron nitride has anti chemical erosion properties and is not corroded by inorganic acids and water. The boron nitrogen bond is broken in hot concentrated alkali. Oxidation begins in the air above 1200 ℃. Under vacuum, it begins to decompose at around 2700 ℃. Slightly soluble in hot acid, insoluble in cold water, relative density 2.29. The compressive strength is 170MPa. The maximum operating temperature in an oxidizing atmosphere is 900 ℃, while it can reach 2800 ℃ in a non active reducing atmosphere. However, the lubrication performance is poor at room temperature. Most of the properties of boron nitride are superior to those of carbon materials. For hexagonal boron nitride: low friction coefficient, good high-temperature stability, good heat resistance and shock resistance, high strength, high thermal conductivity, low expansion coefficient, high electrical resistivity, corrosion resistance, and ability to transmit microwave or infrared radiation.
Material structure
The hexagonal crystal system of boron nitride is most commonly composed of graphite lattice, and there are also amorphous variants. In addition to the hexagonal crystal form, boron nitride has other crystal forms, including rhombic boron nitride (r-BN), cubic boron nitride (c-BN), and wurtzite boron nitride (w-BN). People have even discovered two-dimensional boron nitride crystals like graphite flakes.
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