Boron nitride fibers


Hexagonal BN can be prepared as fibers, structurally similar to carbon fibers, sometimes called "white carbon fiber." They can be prepared by the thermal decomposition of extruded borazine fibers by adding boron oxide in nitrogen at 1800 °C. The material also arises by the thermal decomposition of cellulose fibers impregnated with boric acid or ammonium tetraborate in an atmosphere of ammonia and nitrogen above 1000 °C. Boron nitride fibers are used as reinforcement in composite materials, with the matrix materials ranging from organic resins to ceramics to metals (see Metal matrix composites). Like BN fibers, boron nitride nanotubes(BNNTs) show promise for aerospace applications where integration of boron and, in particular, the light isotope of boron (10B) into structural materials improves their radiation-shielding properties, due to 10B's neutron absorption properties. Such 10BN materials are of particular theoretical value as a composite structural material in future manned interplanetary spacecraft, where absorption-shielding from cosmic ray spallation neutrons is expected to be a specific asset in light construction materials. Boron nitride nanomesh is a new inorganic nanostructured two-dimensional material. It consists of a single layer of hexagonal boron nitride on rhodium or ruthenium, forming a highly regular mesh. The distance between two pore centers is 3.2 nanometers (=0.0000032 mm!), and the pores are 0.05 nanometer deep. The boron nitride nanomesh is stable under vacuum, air, and some liquids but also up to temperatures of 796 C. In addition, it shows the extraordinary ability to trap molecules and metallic clusters. These characteristics promise exciting applications of nanomesh in nanotechnology. If you are looking for high quality, high purity, and cost-effective Boron nitride, or if you require the latest price of Boron nitride, please feel free to email contact mis-asia.

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