Hexagonal Boron Nitride Powder: The Bright Star Of High Performance Materials

In the vast world of materials science, hexagonal boron nitride powder is gradually emerging, attracting many researchers and enterprises with its unique properties and wide range of application prospects.
Hexagonal boron nitride (abbreviated as h-BN), from the molecular structure, belongs to the hexagonal crystal system, has a hexagonal crystal structure that is very similar to that of graphite, and it is made of multilayers stacked one on top of another, with layers connected to each other by van der Waals forces. This special structure gives hexagonal boron nitride powder many excellent properties. It appears as a white powder, and thus is figuratively called "white graphite".
In terms of performance, hexagonal boron nitride has good electrical insulation, with a conductivity of 10¹⁴ ~ 10¹⁸Ω/cm at room temperature, and even at a high temperature of 1,000°C, it can still be maintained at 10¹⁴ ~ 10⁶Ω/cm, which makes it very useful in the field of electrical insulation. Its thermal conductivity is also very good, the coefficient of thermal expansion is small, good resistance to thermal vibration, can be in different temperature environment to maintain stable performance. In terms of lubrication, it has excellent performance, with a coefficient of friction of only 0.16, and this value does not increase at high temperatures. Compared with traditional lubricating materials such as molybdenum disulfide and graphite, it has a higher temperature resistance, and it can be used up to 900°C in oxidizing atmospheres, and even up to 2,000°C in a vacuum. In terms of chemical stability, hexagonal boron nitride has excellent performance, neither wetting nor reacting with a wide range of metals and glass melts, and keeping its properties stable in complex chemical environments. In addition, it also has a low dielectric constant and dielectric loss, the dielectric loss is only (2 ~ 8) × 10-⁴, the breakdown strength is more than twice that of Al₂O₃, reaching 30 ~ 40kV/mm, which is an ideal high-frequency insulation, high-voltage insulation, and high-temperature insulation materials. It is worth mentioning that the hexagonal boron nitride is very easy to be finish machined by conventional metal cutting technology, and the turning accuracy can reach 0.05mm, which is capable of machining products with complex shapes.
In the field of application, hexagonal boron nitride powder is everywhere. In the electronics industry, due to its good thermal conductivity and electrical insulation, it is widely used as a heat transfer material, which can effectively solve the problem of avoiding short circuits due to the need for high-resistivity materials when the heat-conducting material is in contact with running electrical components. In high-temperature industrial scenarios, it can be used as a high-temperature solid lubricant for the mold release of various precision casting products, can also be used as a high-temperature parts of aircraft, rocket engine nozzles and other materials, in the atomic reactor can also act as a structural material, by virtue of its strong neutron-absorbing capacity, to ensure the safe operation of the reactor. In material synthesis, it is the key raw material for the synthesis of cubic boron nitride (CBN) abrasive, by reacting with the catalyst at high temperature and ultra-high pressure to generate extremely hard cubic boron nitride. In the cosmetic industry, based on the lubricating and lightweight properties of its layered crystal structure, h-BN powder is often used as a body pigment, which not only has excellent coating and adhesion properties, but also has a white appearance that can effectively regulate the spreading of the product, skin-fit, gloss, skin texture, as well as the molding and usability of the product. In addition, in the field of refractory materials, it can be used as an oxidizing additive, especially in the occasion of molten metal corrosion resistance to play an important role; in a variety of high temperature, corrosion resistance, oxidation resistance coatings, you can also see the application of hexagonal boron nitride powder.
With the continuous progress and development of science and technology, hexagonal boron nitride powder, with its excellent performance, will be used in more fields, injecting new vitality into the development of materials science, and blossoming in the future stage of science and technology with more dazzling light.