The South China University of Technology

Zhongchen Lu

Min Zhu

Meiqin Zeng

Wei Wang

Liuzhang Ouyang

Hui Wang

Renzong Hu

Xianyong Bao

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&#x2014;C&#x2014;Co powder is subjected to planetary ball milling with controlled process parameters; then, after plasma-assisted ball milling, W&#x2014;C&#x2014;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&#x2014;Co cemented carbide containing plate-shape WC grains are optimized, so that the cemented carbide has excellent overall mechanical properties.

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

Generating plasma by using dielectric barrier discharge and introducing a dielectric barrier discharge electrode bar into a high-speed vibrating ball milling tank requires that, on one hand, a solid insulation medium on the outer layer of the electrode bar can simultaneously bear high-voltage discharge and mechanical shock failure of the grinding ball, and on the other hand, the high-speed vibrating ball milling device can uniformly process the powder. The discharge space pressure is set to a non-thermal equilibrium discharge state with a pressure of about 10to 10Pa, discharge plasmas are introduced to input another kind of effective energy to the processed powder, so as to accelerate refinement of the powder to be processed and promote the alloying process and improve the processing efficiency and the effect of the ball mill.

Application method and device for cold field plasma discharge assisted high energy ball milled powder

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Guangzhou, China

Zhongchen Lu