Tungsten Carbide
Title: Tungsten Carbide
CAS Registry Number: 12070-12-1
Molecular Formula: CW
Molecular Weight: 195.85
Percent Composition: C 6.13%, W 93.87%
Line Formula: WC
Literature References: Stable, wear-resistant material with hardness close to diamond. Prepn: S. Hilpert, M. Ornstein, Ber. 46, 1669 (1913); M. R. Andrews, J. Phys. Chem. 27, 270 (1923); A. E. Newkirk, I. Aliferis, J. Am. Chem. Soc. 79, 4629 (1957). Heat of combustion: L. D. McGraw et al., ibid. 69, 329 (1947). Development of WC dental burs: J. Osborne et al., Br. Dent. J. 90, 229 (1951). Review of industrial-scale production and applications: A. S. Hester et al., Ind. Eng. Chem. 52, 94-100 (1960). Structural and electronic properties: A. Y. Liu et al., Phys. Rev. B 38, 9483 (1988). Catalytic properties: E. Iglesia et al., Catal. Today 15, 307 (1992). Physical properties and calculated electronic structure: H. W. Hugosson, H. Engqvist, Int. J. Refractory Metals Hard Mater. 21, 55 (2003). FTIR characterization of thin films and bulk samples: P. Hoffmann et al., Mater. Charact. 50, 255 (2003). Combustion synthesis: G. Jiang et al., Ceram. Int. 30, 185, 191 (2004). Review of toxicology and human exposure: Toxicological Profile for Tungsten (PB2006-100007, 2005) 203 pp.
Properties: mp 2600-2850°. Hardness: 16-22 GPa. Youngs modulus: 696 GN m-2. Fracture toughness: 28 MPa m1/2. Compressive strength (20°): 5 GPa. Heat of combustion (DH298.16): -285.80 ±0.07 kcal/mol.
Melting point: mp 2600-2850°
Use: In drill tips, mining, metal cutting tools, dental burs, surgical instruments, wear-resistant coatings. In mfr of cemented carbide. Substitute for noble metals in catalysis.

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