Boron nitride and its development history

Byadmin

Apr 26, 2023

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What is boron-nitride? Boron Nitride is a crystal made of nitrogen atoms, boron atoms. It has a chemical composition of 43.6% Boron and 56.4% Nitrogen. There are four types: hexagonal boron Nitride, rhombohedral Borion Nitride (RBN), cubic boren nitride [CBN], and wurtzite Boron (WBN).
The development 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. Because its structure and properties are very similar, as well as its whiteness, white graphite is also commonly known.
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 BN hot-press method was invented. American Diamond Company, Union Carbon Company and others were the first 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 bounds. 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 chemical and physical properties 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. In hot concentrated acid, the boron/nitrogen bond is broken. Above 1200 it will begin to oxidize. It starts to decompose around 2700oC in a vacuum. It is somewhat soluble with hot acid. Insoluble in cold water. Relative density 2.29. The compressive strength is 170MPa. The maximum operating temperature in an oxidizing environment is 900degC, while it can reach 2800degC when inactively reducing. However, the lubrication performance at room temperature is poor. The majority of the properties of Boron Nitride are better than those of carbon materials. For hexagonal Boron Nitride: High friction coefficient, good high temperatures stability, good thermal shock resistance.
Material structure
Hexagonal graphite nitride crystals are the most popular. However, there are other crystal forms of boron. These include rhombohedral, cubic and cubic boron. 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. High-temperature resistance and special electrolytic materials
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 various shapes and sizes of boron Nitride products. These can be used for insulation, heat dissipation, and high temperature pressure.
6. Aerospace thermal shielding materials
7. After high temperature and pressure treatment, the catalyst can convert it into cubic boron nutride with diamond-like hardness.
8. The structural materials for the atomic bomb reactor.
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 and 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 kinds of cigarettes labels, beer labels packaging boxes, cigarette packaging box, etc.
17. Lipstick filler is non-toxic and lubricious.

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