Cermet cutting tool having excellent wear resistance and tenacity and method of manufacturing thereof

Abstract

Abstract PURPOSE:To maintain, wear resistance and tenacity for a cermet cutting tool, by specifying the composition of composite metal carbon nitride constituting a dispersed phase, and by subjecting it to press-work at a specific temperature and a specific pressure so as to form a nitrogen enriched layer having a concentration agradient which is decreased gradually inward from the outer surface of the layer. CONSTITUTION:60-80wt% of composite metal carbon nitride composed of Ti and one kind or more than two kinds of metal (M) of 5a and 6a groups on the periodic table are added as a dispersed phase, the composition of the metal carbon nitride being specified such that alpha+beta=1, 0.5<=alpha/beta<=8, x+y=1, 0.2<=x/y<1.5, 0.8<=z<=1 are satisfied when the composition is expressed by (Ti<M) (Cx, Ny)z. The remainder is a combined phase consisting of one kind or two kinds of Co and Ni as main components. This material is subjected to hot statically hydraulic press work in the atmosphere of nitrogen at a temperature of 1,000-1,3000 deg.C and a pressure of 5-2,000atm, so that there is formed a nitrogen enriched layer having such a concentration gradient that the content of nitrogen is greater in the outer surface part than in the inside part of the layer.

Inventors

• 👤 Noribumi Kikuchi
• 👤 菊池　則文
• 👤 Hiroshi Nakahara
• 👤 中原　啓
• 👤 Hironori Yoshimura
• 👤 吉村　寛範

Bibliographic Details