Document Type : Original Article
Author
Department of Research and Development, UOP, England
Abstract
In the general field of cemented carbides, cobalt-bonded tungsten carbide groups are the category that has undergone the most development over the past three decades. Arrangements, physical properties, manufacturing methods and application of this class of materials have been reviewed in the cemented carbides article in this issue. In many applications, tungsten carbide bonded to cobalt has certain disadvantages. The properties of titanium carbide bonded to steel can be compared to the same material for tungsten carbide bonded to cobalt as follows:
Titanium carbides bonded to steel respond to heat treatment and when the joint is in an annealed condition, it can be machined with conventional machines.
Carbide bonded to fully hardened steel can be heated to a variety of temperatures. Hence, it obtains more ductility than tungsten carbide bonded to cobalt.
Cemented tungsten carbides are materials with high modulus. Carbides bonded to steel have a modulus that is not greater than that of steel.
The coefficient of thermal expansion of steel-bonded carbides is closer to that of steel than to cemented tungsten carbides.
Both tungsten carbide and carbide products can be soldered.
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