Tungsten Carbide/Cobalt WC 94/Co 6 - Supplier Data by Goodfellow

Background

Tungsten Carbide is a hard, brittle ceramic which, when combined with 6% to 10% Cobalt, forms a tough Cermet (Ceramic-Metal).

This material was developed for use in cutting tools, having hard ceramic crystals of a few microns in size within a ductile metal matrix. The resulting material can withstand the high compressive stresses imposed during cutting, as well as having good wear and oxidation resistance at the high temperatures reached.

Tungsten Carbide has a high resistance to thermal shock, so is able to withstand the rapid temperature fluctuations. Also, Tungsten Carbide has found a use as electrodes for Electrode Discharge Machining.

Key Properties

The key properties of Tungsten Carbide are tabulated below.

Table 1. Key properties

Electrical Properties
Volume resistivity ( Ohm.cm ) 2x10-6 @ 25 °C
Mechanical Properties
Compressive strength ( MPa ) 5300-7000
Hardness - Vickers ( kgf.mm-2 ) 1550
Tensile modulus ( GPa ) 600
Tensile strength ( MPa ) 1440
Physical Properties
Density ( g.cm-3 ) 14.95
Thermal Properties
Coefficient of thermal expansion ( x10-6 K-1 ) 4.6-5.0 @ 20-1000 °C
Specific heat ( J.K-1.kg-1 ) 200-480 @ 25 °C
Thermal conductivity ( W.m-1.K-1 ) 60-80 @ 20 °C

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