-
1.发明授权公开(公告)号：US10961606B2
公开(公告)日：2021-03-30
申请号：US16343766
申请日：2017-12-21
Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY
Inventor： Min Zhu , Wei Wang , Zhongchen Lu , Meiqin Zeng , Xianyong Bao
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.
-
公开(公告)号：US10758916B2
公开(公告)日：2020-09-01
申请号：US15539360
申请日：2014-12-24
Applicant: South China University of Technology
Inventor： Min Zhu , Meiqin Zeng , Zhongchen Lu , Liuzhang Ouyang , Hui Wang , Renzong Hu
Abstract: 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 102 to 106 Pa, 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.
-
3.发明申请公开(公告)号：US20170348699A1
公开(公告)日：2017-12-07
申请号：US15539360
申请日：2014-12-24
Applicant: South China University of Technology
Inventor： Min Zhu , Meiqin Zeng , Zhongchen Lu , Liuzhang Ouyang , Hui Wang , Renzong Hu
Abstract: The present invention provides an application method for cold field plasma discharge assisted high energy ball milled powder and a plasma assisted high energy ball milling device using the method for cold field plasma high energy ball milled powder. The present invention generates plasma by using dielectric barrier discharge and introducing a dielectric barrier discharge electrode bar into a high-speed vibrating ball milling tank, which 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. Based on the ordinary ball milling technology, the discharge space pressure is set to a non-thermal equilibrium discharge state with a pressure of about 102 to 106 Pa, 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 under the combined action of the mechanical stress effect and the thermal effect of the external electric field, thereby greatly improving the processing efficiency and the effect of the ball mill.
-
-
Search Results
3
records
(took 0.012 seconds)
