Borosilicate glass of boron


Borosilicate glass, typically 12–15% B2O3, 80% SiO2, and 2% Al2O3, has a low coefficient of thermal expansion, giving it excellent resistance to thermal shock. Schott AG's "Duran" and Owens-Corning's trademarked Pyrex are two prominent brand names for this glass, used in laboratory and consumer cookware and bakeware, chiefly for this resistance. Several boron compounds are known for their extreme hardness and toughness. Boron carbide is a ceramic material which is obtained by decomposing B2O3 with carbon in an electric furnace: 2 B2O3 + 7 C B4C + 6 CO Boron carbide's structure is only approximately B4C, and it shows an apparent depletion of carbon from this suggested stoichiometric ratio. This is due to its very complex structure. The substance can be seen with the empirical formula B12C3 (i.e., B12 dodecahedra being a motif). Still, with less carbon, the suggested C3 units are replaced with C-B-C chains, and some smaller (B6) octahedra are also present (see the boron carbide article for structural analysis). The repeating polymer plus the semi-crystalline structure of boron carbide gives it excellent structural strength per weight. It is used in tank armour, bulletproof vests, and numerous other structural applications. Boron carbide's ability to absorb neutrons without forming long-lived radionuclides (especially when doped with extra boron-10) makes the material attractive as an absorbent for neutron radiation arising in nuclear power plants. Nuclear applications of boron carbide include shielding, control rods and shut-down pellets. Boron carbide is often powdered within control rods to increase its surface area. If you are looking for high quality, high purity and cost-effective Boron, or if you require the latest price of Boron, please feel free to email contact mis-asia.

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