초록 ▼

The present invention is characterized by a ceramic sintered body consisting of (1) a primary mixed powder in which boride metal powder the MB2 type or M2B5 type (M indicates the metal) is mixed with a titanium hafnium carbide powder; (2) a secondary mixed powder in which titanium carbonitride is mi

The present invention is characterized by a ceramic sintered body consisting of (1) a primary mixed powder in which boride metal powder the MB2 type or M2B5 type (M indicates the metal) is mixed with a titanium hafnium carbide powder; (2) a secondary mixed powder in which titanium carbonitride is mixed with the above-mentioned primary mixed powder; or (3) a tertiary mixed powder or a quaternary mixed powder in which carbide powder such as hafnium carbide or zirconium carbide is mixed with above-mentioned primary mixed powder or the secondary mixed powder. The resulting sintered bodies have high hardness and toughness.

대표청구항 ▼

A titanium hafnium carbide-boride metal-base ceramic sintered body for use as a cutting tool and mechanical member prepared by sintering a powdery mixture consisting essentially of: (a) a titanium hafnium carbide solid solution having a ratio of atomic weight of titanium to hafnium of from 99:1 to 1

A titanium hafnium carbide-boride metal-base ceramic sintered body for use as a cutting tool and mechanical member prepared by sintering a powdery mixture consisting essentially of: (a) a titanium hafnium carbide solid solution having a ratio of atomic weight of titanium to hafnium of from 99:1 to 1:99, and (b) from 5 to 95% by weight of at least one boride metal selected from the group consisting of TiB2, CrB2, TaB2, MnB2, MoB2, VB2, NbB2, HfB2, AlB2, ZrB2, W2B5 and Mo2B5, said powdery mixture having a mean particle size of less than 2 mm and said ceramic sintered body having substantially no pores observable by electron microscope.