Ti(C, N)基サーメットと超硬合金の同時焼結

概要

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Layered compacts, which were composed of cemented carbide/cermet/cemented carbide layers, were sintered at 1673 K for 1.2 ks under vacuum. Compositions of cermet and cemented carbide layers were Ti(C, N)-30WC-5Mo2C-20Co (mass%) and WC-2TaC-6Co (mass%), respectively. These alloy powders were prepared by mechanical milling from Ti(C, N), WC, Mo2C, TaC and Co powders. The milling was carried out for 1.8 ks under Ar atmosphere.The cermet layer showed slightly different sintering behavior from the cemented carbide, thus slight residual compressive stress was detected in the cemented carbide layer. However, the compact was successfully sintered without delamination and rather showed the flat surfaces at the boundaries on the edge face. The solid solution composed of WC, TiC and TaC was observed at the interface between cermet and cemented carbide layers.