The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 2020
Filed:
May. 30, 2017
Korloy Inc., Seoul, KR;
Seong-woo Cho, Cheongju-si, KR;
Dong-youl Lee, Cheongju-si, KR;
Jae-hoon Kang, Cheongju-si, KR;
Soon-yong Hong, Cheongju-si, KR;
Sun-yong Ahn, Cheongju-si, KR;
Young-heum Kim, Cheongju-si, KR;
KORLOY INC., Seoul, KR;
Abstract
The present invention relates to a hard coating including an MT-TiCN layer and an α-alumina layer which are formed by using a chemical vapor deposition method. A hard coating for cutting tools, which is a coating formed on a base material of a cutting tool formed of a hard material, the coating comprising: a TiCN layer; and an α-alumina layer formed on the TiCN layer, wherein: the α-alumina layer has a main peak (maximal strength peak) of (006) plane located between 20-40 degrees during a psi rocking analysis by an XRD; a residual stress in the α-AlOlayer is −0.9-0.4 GPa; the TiCN layer is composed of TiCNO(x+y+z≤1, x>0, y>0, z≥0); a composition ratio of C/(C+N) is greater than or equal to 0.4 and smaller than 0.5; the ratio of TC(220)/TC(422) is smaller than 0.45; and the ratio of TC(220)/TC(311) is less than 0.45.