Boron Carbide


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boron carbide

[′bȯ‚rän ′kär‚bīd]
(organic chemistry)
Any compound of boron and carbon, especially B4C (used as an abrasive, alloying agent, and neutron absorber).

Boron Carbide

 

(B4C; more correctly B12C3), a compound of boron and carbon. It is formed during the interaction of boron or boric anhydride with carbon at a temperature above 2000° C. It consists of black, shiny crystals with a density of 2.52 g/cm3 and a melting point of 2360° C. It is stable in air up to 1000° C and does not react to acids but is decomposed by alkalis. It exceeds corundum (Al2O3) and carborundum (SiC) in hardness and is softer only than diamond and borazon. It is used as an abrasive and grinding material, as a semiconductor, and also in nuclear engineering, as a neutron-absorbing material.

References in periodicals archive ?
Boron carbide is a very hard material that provides excellent resistance to abrasive wear.
Gopalkrishna gave the result that maximum weight percentage of the boron carbide which can be added to the aluminium matrix phase is 15wt%, Adding the boron carbide beyond this weight percentage may leads to the aggravate situation which includes the reduction in the tensile and compressive stress[1].
Mostly, titanium is borided in powders of amorphous boron or boron carbide [7 .
We started with a Hobart mixer to determine the feasibility of a mix design well over 50 percent boron carbide powder, which has particle characteristics like portland cement and is similarly milled," says Branscome's Jack Kowalski, Specialty Products & Quality Assurance.
In 2010, he and his colleagues converted one into lightweight body armour by converting the fabric into boron carbide nanowires.
Abrasion protection features supplied to resist the harsh mechanical forces of shot blasting include bonded rubber lining of the blast enclosure, cast urethane ducting to the reclaimer, lining of the cyclone inlet elbow, body and cone, as well as boron carbide lined blast nozzles.
A useful shielding material consists of the resin plus copper, aluminum hydroxide or magnesium hydroxide as a refractory material, and boron carbide.
Among the topics are nanomechanics of coatings for electronic and optical applications, structural and magnetic properties of nanosized barium hexaferrite powders obtained by microemulsion, a highly effective selective absorbing coating for solar thermal collectors, the wetting ability of silver-based molten alloys on graphite substrate, the pressureless sintering of superhard materials based on boron carbide, thickness-dependent interface parameters of silicon oxide films grown on plasma hydrogenated silicon, and some medical applications of nanomaterials.
The company said raw material, including boron carbide, an element used primarily to reinforce advanced composites, and the machinery deployed to produce the shield were entirely provided through national means.
Good prospects of using boron carbide as a material of erosion-resistant coatings for protection of parts of state-of-the-art machinery are stipulated by its high hardness, high-temperature strength, chemical inertance and low density (2.
A Georgia Institute of Technology researcher has perfected a process that makes boron carbide harder and poreless in high temperature manufacturing.