Why tungsten carbide has better wear resistance than any other alloy steel ?
Wear is nothing other than removal of material over application of a contact load. In this case this is due to friction.
And when we talk about removal of materials, the phenomenon comprises of permanent fracture and deformation of materials in small debris.
Simply, materials which have high strength needs higher force to permanently deform or fracture it. Tungsten carbide has a high melting point at 2,865 °C and boiling point of 5986 °C. So at normal temperatures (> 1000 °C) their thermal and other physical stability is excellent. It also has a very high hardness of around 2500 Vickers hardness and elastic modulus up to 700 GPa. Such high strength and high hardness material needs tremendous force to deform.
Comparing with steel, it is two times stiffer and has density twice that of steel. And these properties are almost same even at high temperatures. Obviously tungsten carbide will have better wear resistance than any alloys steel.
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