TIB2-CO SERIES SINTERED HARD ALLOY AND CUTTING TOOL AND MANUFACTURE OF SINTERED HARD ALLOY

摘要

PURPOSE:To manufacture a TiB2-Co series sintered hard alloy having high density and high deflective strength and having a structure with uniform grain size by bonding many TiB2 grains with a bonding layer contg. a Co simple substance or Co. CONSTITUTION:Grains contg. a Co simple substance or Co are mixed with TiB2 grains, and this mixed grains are subjected to pressure sintering in the temp. range of 1,200 to 1,800 deg.C. At this time, the content of Co is regulated to 2 to 30 vol. to the total volume of the TiB2 grains and the bonding layer. In this way, the TiB2-Co series sintered hard alloy excellent in wear resistance and thermal shock resistance can be obtd. by short time sintering and is useful as the material for cutting tools.