CERMET AND COATED CERMET

WIPO Patent Application WO/2011/136197

A1

Provided is a cermet such that wear resistance and fracture resistance are excellent, and that tool lives are stable. The cermet consists of a first hard phase of a complex carbonitride solid solution, a second hard phase of WC, and a bonded phase which is composed primarily of Co and Ni. The first hard phase is a cored structure consisting of a complex carbonitride solid solution core which satisfies (Ti1-x-y Lx Moy)(C1-zNz), where L denotes at least one type of element that is selected from a group consisting of Zr, Hf, Nb, and Ta, and where x, y, and z satisfy 0.01 ≤ x ≤ 0.5, 0 ≤ y ≤ 0.05, and 0.05 ≤ z ≤ 0.75; and a complex carbonitride solid solution rim which satisfies (Ti1-a-b-d Ra Mob Wd)(C1-eNe), where R denotes at least one type of element that is selected from a group consisting of Zr, Hf, Nb, and Ta, and where a, b, d, and e satisfy 0.01 ≤ a ≤ 0.5, 0 ≤ b ≤ 0.05, 0.01 ≤ d ≤ 0.5, and 0.05 ≤ e ≤ 0.75, respectively. This cermet is characterized in that the number of first hard phase cored structure grains which satisfy 0.2 ≤ (rmin/rmax) ≤ 1 is 85% or more of the total number of first hard phase cored structure grains, where rmax is the maximum thickness of the rim of the first hard phase cored structure grain, and rmin is the minimum thickness of the rim of the first hard phase cored structure grain.

TAMURA KEITARO
TANIGUCHI YASURO
HAYASHI KOJI

PCT/JP2011/060105

November 03, 2011

April 26, 2011

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TUNGALOY CORP (JP)
TAMURA KEITARO
TANIGUCHI YASURO
HAYASHI KOJI

B23B27/14; C22C29/04; C22C1/05

JP2010031308A	2010-02-12
JPH10298696A	1998-11-10
US4778521A	1988-10-18
JPH03170637A	1991-07-24
JPH04231467A	1992-08-20
JPH10110234A	1998-04-28

TSUKUNI, HAJIME (JP)
Hajime Tsukuni (JP)

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