Tungsten Carbide Physical properties

Tungsten carbide has a high melting point at 2,870 °C (5,200 °F), a boiling point of 6,000 °C (10,830 °F) when under a pressure equivalent to 1 standard atmosphere (100 kPa), a thermal conductivity of 110 W·m?1·K?1,and a coefficient of thermal expansion of 5.5 μm·m?1·K?1.

Tungsten Carbide Plate Picture

Tungsten carbide is extremely hard, ranking about 9 on Mohs scale, and with a Vickers number of around 2600.It has a Young's modulus of approximately 530–700 GPa, a bulk modulus of 630–655 GPa, and a shear modulus of 274 GPa. It has an ultimate tensile strength of 344 MPa, an ultimate compression strength of about 2.7 GPa and a Poisson's ratio of 0.31.

The speed of a longitudinal wave (the speed of sound) through a thin rod of tungsten carbide is 6220 m/s.

Tungsten carbide's low electrical resistivity of about 0.2 μΩ·m is comparable with that of some metals (e.g. vanadium 0.2 μΩ·m).

Tungsten carbide is readily wetted by both molten nickel and cobalt. Investigation of the phase diagram of the W-C-Co system shows that WC and Co form a pseudo binary eutectic. The phase diagram also shows that there are so-called η-carbides with composition (W,Co)

6C that can be formed and the brittleness of these phases makes control of the carbon content in WC-Co hard metals important.

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