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application of boron nitride

2018-11-23 11:04 View:
Control nuclear fission
Boron carbide can absorb a large amount of neutrons without forming any radioisotope, so it is an ideal neutron absorber in nuclear power plants, and neutron absorbers mainly control the rate of nuclear fission. Boron carbide is mainly made into a controllable rod shape in the nuclear reactor field, but sometimes it is powdered because it has to increase the surface area. At the Chernobyl nuclear accident in 1986, a front-line aviation regiment in Tozuk, Russia, was transferred to the east of Chernobyl. The helicopters from Mi-8 to Mi-26 were immediately put into the airlift mission. . After the boron carbide is exhausted, ordinary sand is released. As the launch progresses, the flight becomes much easier. After the helicopter dropped nearly 2,000 tons of boron carbide and sand, the engineer finally announced that the chain reaction in the reactor had stopped, and the total helicopter throughput was 5,000 tons.
Abrasive material
Since boron carbide is a harder solid than silicon carbide or tungsten carbide, it has been used as a coarse sand abrasive material for a long time. Since it has a high melting point and is not easily cast into an artificial product, it can be processed into a simple shape by melting the powder at a high temperature. Used for grinding, grinding, drilling and polishing of hard materials such as cemented carbide and gemstones.

Coating coating
Boron carbide can also be used as a ceramic coating for warships and helicopters. It is lightweight and resistant to the ability of armor-piercing bullets to penetrate the hot-pressed coating into an integral layer.

It can be used in the arms industry to make gun nozzles. Boron carbide, extremely hard and wear-resistant, does not react with acid and alkali, high/low temperature resistance, high pressure resistance, density ≥2.46g/cm3; microhardness ≥3500kgf/mm2, flexural strength ≥400Mpa, melting point is 2450°C. Because of the above-mentioned high wear resistance of boron carbide nozzles, boron carbide blasting nozzles will gradually replace known cemented carbide/tungsten steel and sandblasting nozzles made of silicon carbidesilicon nitride, alumina, zirconia, etc. .

Boron carbide is also used in the manufacture of metal borides and in the smelting of sodium borates, boron alloys and special welds.
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