Preparation method of a WC cemented carbide with adjustable alignment of plate-shape grains

US10961606B2 · kind B2 · utility

Assignee

• South China University of Technology · CN

Inventors

• Min Zhu · Los Altos Hills, US
• Wei Wang · Kennewick, US
• Zhongchen Lu · 流花街道, CN
• Meiqin Zeng · 流花街道, CN
• Xianyong Bao · 流花街道, CN

Key dates

• Filing date: Dec 21, 2017
• Grant date: Mar 30, 2021
• Expiry date: Jun 15, 2038

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22F2999/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention discloses a preparation method of a WC cemented carbide with adjustable alignment of plate-shape grains. According to the theoretical composition of the cemented carbide, the weighed W powder is composed of two raw W materials with significantly different particle sizes in a certain mass ratio. Also graphite powder and Co powder are weighed. W—C—Co powder is subjected to planetary ball milling with controlled process parameters; then, after plasma-assisted ball milling, W—C—Co composite powder composed of small-sized lamellar W sheets and large-sized lamellar W sheet is obtained; Finally dense cemented carbide containing plate-shape WC grains is obtained by press molding of the ball milled power and in-situ carbonization through sintering at a high temperature. The invention not only provides simple preparation process with low energy consumption, but also can regulate the degree of orientated alignment of the plate-shape WC in the sintered block. Besides, the mechanical properties of the WC—Co cemented carbide containing plate-shape WC grains are optimized, so that the cemented carbide has excellent overall mechanical properties.