公开(公告)号：US20210197264A1

公开(公告)日：2021-07-01

申请号：US17200475

申请日：2021-03-12

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Gang CHEN ,  Mingli QIN ,  Qiying TAO ,  Xuanhui QU

IPC: B22F9/04 ,  B33Y70/00 ,  B01J2/16 ,  B22F1/00

Abstract: A method of preparation of titanium and titanium alloy powder for 3D printing is based on a fluidized bed jet milling technique. Hydride-dehydrate titanium powder and titanium alloy powder are used as main raw material powder, jet milling and shaping are carried out in shielding atmosphere of nitrogen or argon, and finally high-performance titanium and titanium alloy powder meeting the requirements of 3D printing process is obtained. The titanium and titanium alloy powder prepared using this method has a narrow particle size distribution, approximately spherical shape, and controllable oxygen content.

公开(公告)号：US20200208701A1

公开(公告)日：2020-07-02

申请号：US16793938

申请日：2020-02-18

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING ,  BEIJING TIANYISHANGJIA NEW MATERIAL CORP., LTD.

Inventor： Lin ZHANG ,  Xuanhui QU ,  Peng ZHANG ,  Peifang WU ,  Mingli QIN ,  Cairang SHIJIA ,  Jingwu CAO ,  Kangxi FU

IPC: F16D69/02 ,  B22F3/16 ,  B22F7/00 ,  C22C47/14 ,  C22C49/02 ,  C22C49/14 ,  F16D65/092 ,  G01N19/02

Abstract: The present disclosure relates to a fiber-reinforced copper-based brake pad for high-speed railway train, and preparation and friction braking performance thereof. The fiber-reinforced copper-based brake pad for high-speed railway train comprises 80-98.5 wt. % metal powder, 1-15 wt. % non-metal powder and 0.5-5 wt. % fiber component. In addition, some components are added in a specific proportion to achieve optimal performance. The copper-based powder metallurgy brake pad is obtained by powder mixing, cold-pressing and sintering with constant pressure. The friction braking performance of the obtained brake pad is tested according to a braking procedure consisting of three stages, i.e., the first stage with low-pressure and low-speed, the second stage with high-pressure high-speed and the continuous emergency braking third stage with high-pressure and high-speed. The brake pad has advantages including higher and more stable friction coefficient, higher fade and wear resistance and slighter damage to brake disc at high speeds.