Boron nitride and its development history

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What is boron-nitride? Boron Nitride is a crystal made of nitrogen atoms, boron atoms. The chemical composition of Boron nitride is 43.6% Boron and 56.4% Nitrogen. There are four types: hexagonal boron Nitride, rhombohedral Borodure (RBN), cubic boren nitride [CBN], and wurtzite boron Boron (WBN).
The history of boron-nitride
Boron nitride More than 100 years have passed since its invention. It was used in high-temperature lubricants as a hexagonal boron nutride. Its structure, as well as its properties, are very similar to graphite. This is why it is also commonly known by the name white graphite.
Boron Nitride (BN) ceramics was first discovered in 1842. Since the Second World War, a lot has been done abroad on BN materials. It was not developed until 1955, after the hot pressing process was perfected. American Diamond Company, Union Carbon Company were the first companies to start production. In 1960, they had produced more that 10 tons.
R*H*Wentrof produced CBN in 1957. General Electric Company sold Borazon as a product in 1969. The United States introduced CBN tools in 1973.
Japan imported technology and CBN tools from the United States in 1975.
1979 saw the introduction of the pulsed Plasma technology, which was used for the first time to create a collapsed cBN film at low temperature.
To prepare cBN films, people were able use several methods of chemical vapor deposit (CVD), as well as physical vapor vapor (PVD), at the end the 1990s.
China sees development as a leap and bound. The initial research on BN powder started in 1963. It was then developed successfully in 1966. It was finally put into production by 1967.

The physical and chemical characteristics of boron-nitride
Physical properties
CBN crystals are usually dark brown or red with a zinc mix structure and good thermal conductivity. CBN is hardier than diamond and is used in a variety of applications, including as abrasives and tool materials.
Boron Nitride is chemically inert and can be corroded by water and organic acids. The hot concentrated alkali breaks the boron/nitrogen bond. Above 1200 it will begin to oxidize. It starts to decompose around 2700degC in a vacuum. It is slightly soluable in hot acid but insoluble when dissolved in cold water. The relative density is 2.29. The compressive strength is 170MPa. The maximum operating temperature in an oxidizing environment is 900 degC, while it can reach 2800 degC when inactively reducing. However, the lubrication performance at room temperature is poor. The majority of the properties of Boron Nitride are superior to those of carbon materials. Hexagonal Boron Nitride has a low friction coefficient and good high-temperature stability. It also has high thermal resistance, high strength, low expansion coefficient and corrosion resistance.
Material structure
Hexagonal graphite nitride crystals are the most popular. There are also amorphous forms. In addition to hexagonal crystal forms, boron nuitride also has other crystal forms such as cubic rhombohedral and boron Nitride (r-BN), Boron nitride (c-BN), wurtzite type boron nitride (w-BN). Even graphene-like two-dimensional boron nutride crystals were discovered by people.
Boron Nitride is used
1. Metal forming mold release agents and metal wire-drawing lubricant.
2. Special electrolytic and resistant materials for high temperatures
3. High-temperature solid oil lubricants, extrusion-anti-wear additives. Additives for the production ceramic composite materials. Anti-oxidation additives. Especially suitable for situations that resist corrosion of molten metallics.
4. Heat-sealing deiccant for transistors, and additives to polymers such as resins.
5. Pressed into a variety of boron Nitride products. They can be used for insulation and heat dissipation purposes.
6. Aerospace thermal shielding materials
7. After high temperature and high pressure treatment, the catalyst can convert it into cubic boron nutride with diamond-like hardness.
8. The structural materials used in the atomic bomb.
9. Rocket engines and planes require nozzles.
10. Insulator for plasma arc, high-voltage and frequency electricity
11. Packaging materials that prevent neutron radiation
12. Boron nitride is a superhard material that can be turned into drill bits and high-speed cutters for drilling oil wells.
13. It is used in metallurgy to make the isolating circle of continuous cast steel, the laundering of amorphous metal, and the release agent for continuous-cast aluminum (various optical glasses release agents).
14. Production of evaporation vessels for aluminum plating, including various capacitor films and aluminum plating, of picture tubes, of displays.
15. All kinds of aluminum-plated fresh-keeping packaging bags,
16. All types of laser anti-counterfeiting aluminiu plating, brand heat stamping materials and all types of cigarette, beer, and packaging boxes, including cigarette packaging box boxes.
17. Lipstick filler in cosmetics is safe, non-toxic and shiny.

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