Boron carbide

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An extremely hard, black crystalline powder. Boron carbide is used as an Abrasive and as a refractory material. It is also provides increased resistance to chemicals and abrasion when it is added to ceramics and metal alloys.

Physical and Chemical Properties

Soluble in fused alkali. Insoluble in water, acids.

Composition B4C
Mohs Hardness 9.0
Melting Point 2350 C
Density 2.6 g/ml
Boiling Point 3500 C


Properties of Common Abrasives

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 111
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1374