Korloy Inc.

Yong-hyun Kim

Sun-Yong Ahn

Sung-Gu Lee

Jung-wook Kim

A cemented carbide comprises particles including a tungsten carbide (WC) as a main component; a binder phase including cobalt (Co) as a main component; and particles including a carbide or a carbonitride of at least one selected from the group consisting of Group 4a, 5a, and 6a elements, or a solid solution thereof, wherein a cubic phase free layer (CFL), in which the carbide or the carbonitride is not formed, is formed from a surface of the cemented carbide to a depth of 5 &#x3bc;m to 50 &#x3bc;m.

Cemented carbide with improved toughness

A cutting tool comprises a base material which includes particles including a tungsten carbide (WC) as a main component, a binder phase including cobalt (Co) as a main component, and particles including a carbide or a carbonitride of at least one selected from the group consisting of Group 4a, 5a, and 6a elements, or a solid solution thereof; and a hard film formed on the base material, wherein the hard film comprises at least an alumina layer, a cubic phase free layer (CFL), in which the carbide or the carbonitride is not formed, is formed from a surface of the base material to a depth of 10 &#x3bc;m to 50 &#x3bc;m, and a Co content of a surface of the CFL is 80% or more of a maximum Co content of the CFL.

Growing community of inventors

Cheongju-si, South Korea

Yong-hyun Kim