Physical properties of tungsten carbide
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 acoefficient of thermal expansion of 5.5 µm·m−1·K−1.
Tungsten carbide is extremely hard, ranking ~9 on Mohs scale, and with a Vickers number of ~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 ~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.
With a low electrical resistivity of (~2×10−7 Ohm·m), tungsten carbide's resistivity is comparable with that of some metals (e.g. vanadium2×10−7 Ohm·m).
WC 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 binaryeutectic. The phase diagram also shows that there are so-called η-carbides with composition (W,Co)
6C that can be formed and the fact that these phases are brittle is the reason why control of the carbon content in WC-Co hard metals is important.
Performances are as follows:
1.With strict tolerance extent control
2.Enjoy excellent wear resistance & high toughness
3.Have very good thermal & chemical stability
4.Anti-deformation & deflection
5.A special Hot Isostatic Press (HIP) process provides quality improvement to the finished products to ensure meterial reliability
Bit face designs and carbide button shape selection
tungsten carbide naming and brief