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B
Boron

History

Boron was discovered by French scientists Joseph Gay-Lyussakom and Louis Tenarom in 1808. In the same year, another way of boron was proposed by the English chemist Humphrey Davy. Then in 1892 suggested magnietermichesky way to get Henry Muassan. In 1908 an American researcher E. Veyntraub confirmed the strange formula of crystalline boron - AlB12. And next year, restoring boron hydrogen chloride in the electric arc Veyntraub first received a 99% boron-term cleanliness.

Nowadays

 B4C for many years used for processing hard metal, because of the hardness of boron carbide exceeds almost all other crystals, exceeded only by diamonds. BN - is a substance which is sometimes called white graphite. It was held experience, after which it was received substance superior to even the hardness of diamonds. This substance called borazon. In non-ferrous alloys and ferrous metals boron input to improve their durability and heat strength. Minimum added to the boron steel (0.0005 ... 0005%) increase the depth of hardening, and hence the strength.

Date ASIA EUROPE USA
26/12/2009 230-250 230-250 230-250
19/12/2009 240.72 240.72 240.72
12/12/2009 240.72 240.72 240.72
28/11/2009 240.72 240.72 240.72
21/11/2009 240.72 240.72 240.72
14/11/2009 240.72 240.72 240.72
07/11/2009 240.72 240.72 240.72
02/11/2009 240.72 240.72 240.72
24/10/2009 240.72 240.72 240.72
17/10/2009 240.72 240.72 240.72
10/10/2009 240.72 240.72 240.72
02/10/2009 240.72 240.72 240.72
25/09/2009 241.2 241.2 241.2
18/09/2009 241.2 241.2 241.2
12/09/2009 241.2 241.2 241.2
05/09/2009 241.2 241.2 241.2
28/08/2009 230-250 230-250 230-250
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