HARD MATERIAL PARTS FOR TOOL HAVING VERY HARD COATING LAYERS

摘要

PURPOSE:To obtain hard material parts for a tool having very hard coating layers by forming a cubic BN-base coating layer having a specified atomic weight ratio of B/(N+O) and contg. Ti and/or Al in a specified ratio to B atomic weight on the surface of a hard substrate. CONSTITUTION:The very hard coating layer is formed on the surface of each hard material substrate for a tool. The layer has 0.5-10mum average thickness and consists of cubic BN-base fine grains of <=1mum average grain size having 0.95-1.2 atomic weight ratio of B/(N+O) and contg. Ti and/or Al in 1/500-1/20 ratio to B atomic weight.