Abstract
Sintering of cemented carbides is usually referred to as a typical liquid phase sintering process. However, much of densification is reported to take place in the solid state. This chapter discusses the solid state and liquid state sintering aspects. It provides an overview on the solid state and liquid phase of sintering aspects. Degassing of waxes and contamination by reactive elements or even their traces, influences solid sintering stage. Reactions between the gas phase in the sintering furnace and any oxygen/oxide in the compact also influence solid state sintering. Liquid phase sintering is very attractive as it provides a faster sintering and complete densification without the need for any external pressure. Faster sintering is due to the enhanced atomic diffusion in the presence of liquid phase, which ultimately facilitates material transport. In cemented carbide systems, where the higher melting phase is the harder phase, liquid phase sintering results in a two phase composites material with ductile behavior in spite of a large quantity of hard phase.
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