boron carbide

noun Chemistry.
a black, crystalline, extremely hard, water-insoluble solid, B 4 C, used chiefly as a moderator in nuclear reactors, as an abrasive, and as a refractory.
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boron carbide
 
n
a black extremely hard inert substance having a high capture cross section for thermal neutrons. It is used as an abrasive and refractory and in control rods in nuclear reactors. Formula: B4C

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boron carbide

(B4C), crystalline compound of boron and carbon. It is an extremely hard, synthetically produced material that is used in abrasive and wear-resistant products, in lightweight composite materials, and in control rods for nuclear power generation

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Boron carbide is used in military personnel body armor.
The atomic thickness of boron carbide deposits on the individual tubes is critical to the efficiency of the overall detector.
For the boron carbide system in particular, significant enhancements in both strength and toughness were achieved.
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