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1. (WO2010119795) CEMENTED CARBIDE

Pub. No.:    WO/2010/119795    International Application No.:    PCT/JP2010/056291
Publication Date: Fri Oct 22 01:59:59 CEST 2010 International Filing Date: Thu Apr 08 01:59:59 CEST 2010
IPC: C22C 29/08
C22C 1/05
Applicants: SUMITOMO ELECTRIC HARDMETAL CORP.
住友電工ハードメタル株式会社
UCHINO, Katsuya
内野 克哉
YAMAMOTO, Eiji
山本 英司
Inventors: UCHINO, Katsuya
内野 克哉
YAMAMOTO, Eiji
山本 英司
Title: CEMENTED CARBIDE
Abstract:
Disclosed is a cemented carbide which has high hardness, excellent strength and excellent toughness. The cemented carbide has a hard phase that is mainly composed of WC particles and a binder phase that is mainly composed of CoxWyCz, and contains 0.2-0.9% by mass of Co and 0.2-1.5% by mass of Cr with the balance made up of a binary compound of W and C and impurities. The average particle size of WC particles is not less than 0.2 μm but not more than 0.7 μm, and the standard deviation σ of the particle size of WC particles satisfies σ ≤ 0.25. By containing Co in an amount within the above-specified range, the toughness is improved. In addition, by containing Co in an amount within the above-specified range, sinterability is improved, thereby enabling a lower sintering temperature. By containing Cr, growth of WC particles is effectively suppressed, thereby providing a cemented carbide in which fine WC particles having a uniform particle size are present. Since Cr is present as a metal component, decrease in the strength due to the presence of Cr carbide can be suppressed.