WC-Ni-Si-B₄C계 초경합금 제조 및 스테인레스 스틸과의 확산접합

다국어 초록 (Multilingual Abstract)

The effects of Ni on the mechanical properties of WC-Xwt.%Ni-1.5wt.%Si-1.1wt.%B4C composite (X = 21.6, 23.6, 25.6 and 27.6 wt.%) were investigated in order to replace Co with Ni as the binder metal for hard materials based on WC-Co system. Using X-ray diffraction, optical microscopy, field-emission scanning electron microscopy results, the microstructure, pore distribution and grain size of the composites sintered at 1,150°C were examined with different fraction (X = 21.6, 23.6, 25.6 and 27.6 wt.%) of binder metal Ni. The average WC grain size of the WC-Ni-Si-B4C composites was about 1 μm. The Rockwell hardness : A (HRA) and transverse rupture strength were about 88HRA and 110 kgf/㎟ , respectively. The obtained sample was bonded with SM45C at a temperature of 1,050°C. The thickness and mechanical properties of the bonded area were investigated with different dwell time at a bonding temperature of 1,050°C.

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