公开(公告)号：US12226826B2

公开(公告)日：2025-02-18

申请号：US17768737

申请日：2020-08-17

Applicant: University of Science and Technology Beijing

Inventor： Xin Lu ,  Yu Pan ,  Yucheng Yang ,  Jiazhen Zhang ,  Wei Xu ,  Bowen Liu ,  Ce Zhang ,  Jianzhuo Sun ,  Yanjun Liu ,  Xuanhui Qu

IPC: B22F3/10 ,  B22F1/05 ,  B22F1/12 ,  B22F9/04

Abstract: The present invention provides a high-strength and high-plasticity titanium matrix composite and a preparation method thereof. The preparation method includes: preparing high-oxygen hydride-dehydride titanium powder using a high-temperature rotary ball grinding treatment process, in which the prepared hydride-dehydride titanium powder has a particle size of 10-40 μm, and has an oxygen content of 0.8-1.5 wt. %; preparing high-purity ultra-fine oxygen adsorbent powder using a wet grinding method of high-energy vibration ball grinding treatment process; in which a purity of the oxygen adsorbent powder is ≥99.9%, and a particle size of the oxygen adsorbent powder is ≤8 μm; mixing the high-oxygen hydride-dehydride titanium powder with the oxygen adsorbent powder in a protective atmosphere, and then press-forming the powder obtained after mixing to obtain a raw material blank; and performing atmosphere protective sintering treatment on the raw material blank to obtain a titanium matrix composite. The method prepares a titanium matrix composite reinforced by in-situ self-generating multi-scale Ca—Ti—O, TiC, TiB particles. The microstructure and grains are effectively refined, and the strength and plasticity of the material are significantly improved.

公开(公告)号：US11911826B2

公开(公告)日：2024-02-27

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 ,  B22F1/052

CPC classification number: B22F9/04 ,  B01J2/16 ,  B22F1/052 ,  B33Y70/00 ,  B22F2009/044 ,  B22F2201/02 ,  B22F2201/11 ,  B22F2202/15 ,  B22F2301/205

Abstract: A method of preparation of titanium and titanium alloy powder for 3D printing is based on a fluidized bed jet milling technique. Hydride-dehydrite 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：US11852209B2

公开(公告)日：2023-12-26

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 ,  B22F1/10

CPC classification number: F16D69/028 ,  B22F1/10 ,  B22F1/108 ,  B22F3/16 ,  B22F7/008 ,  C22C47/14 ,  C22C49/02 ,  C22C49/14 ,  F16D65/092 ,  G01N19/02 ,  B22F2301/10 ,  B22F2302/40 ,  B22F2304/10 ,  F16D2200/0008 ,  F16D2200/0026 ,  F16D2200/0052 ,  F16D2200/0065 ,  B22F2998/10 ,  B22F1/108 ,  B22F3/14 ,  B22F2003/023

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.

公开(公告)号：US11618085B2

公开(公告)日：2023-04-04

申请号：US16800688

申请日：2020-02-25

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Baicheng Zhang ,  Lin Zhang ,  Shubin Ren ,  Mingli Qin ,  Xuanhui Qu

IPC: B33Y30/00 ,  B22F12/58 ,  B22F12/67 ,  B22F10/28 ,  B22F12/49 ,  B22F10/14

Abstract: A selective laser melting technology-based apparatus for preparing a gradient material, comprising a laser scanning array lens, and a powder storer, a powder mixer, a powder scraping plate, and a working platform that are provided in sequence from top to bottom; the powder storer is provided with two or more partitions; a bottom portion of the powder storer is provided with an outlet; the powder mixer is provided under the powder storer and is a horizontally provided rotational mixer; the powder scraping plate is disposed under the powder mixer; the working platform is provided under the powder scraping plate; the laser scanning array lens is provided on the working platform. The present invention further relates to a method for preparing a gradient material, comprising powder storing, powder scraping, powder mixing, powder laying, and printing. The method can guarantee the two-phase powder ratio in each layer of powder not change.

公开(公告)号：US11673196B2

公开(公告)日：2023-06-13

申请号：US16793897

申请日：2020-02-18

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Lin Zhang ,  Xuanhui Qu ,  Xingyu Li ,  Mingli Qin ,  Yanhao Dong ,  Ju Li ,  Guanghua Wang ,  Ying Long ,  Wei Zhong

IPC: B22F3/16 ,  B22F9/02 ,  B22F1/05 ,  B22F1/10 ,  B22F1/065 ,  B22F1/142 ,  B22F9/04

CPC classification number: B22F3/16 ,  B22F1/05 ,  B22F1/065 ,  B22F1/10 ,  B22F1/142 ,  B22F9/026 ,  B22F2009/041 ,  B22F2201/013 ,  B22F2201/11 ,  B22F2203/11 ,  B22F2203/13 ,  B22F2301/20 ,  B22F2998/10

Abstract: A method to achieve full densification and grain size control for sintering metal materials, wherein raw material powder is deagglomerated to obtain deagglomerated powder with dispersion. The deagglomerated powder is granulated by spray granulation. The granulated particles are processed by high-pressure die pressing and cold isostatic pressing. The powder compact is sintered by two-step pressureless sintering. The first step is to heat up the powder compact to a higher temperature and hold for a short time to obtain 75-85% theoretical density; the second step is to cool down powder compact to a lower temperature and hold for a long time. The two-step sintering can decrease the sintering temperature, so that the powder compact can be densified at a lower temperature. Thus, the obtained refractory metal product is densified, with ultrafine grains, uniform grain size distribution, and outstanding mechanical properties.

公开(公告)号：US11090718B2

公开(公告)日：2021-08-17

申请号：US16624916

申请日：2019-09-30

Applicant: University of Science and Technology Beijing

Inventor： Mingli Qin ,  Gang Chen ,  Wangwang Ding ,  Xuanhui Qu

IPC: B22F1/00 ,  B33Y70/00

Abstract: A method based on fluidizing for modifying and preparing low-cost titanium powders for 3D printing includes: using hydrogenated-dehydrogenated irregularly-shaped titanium powders as the raw material, adding the titanium powders to a fluidized bed reactor, and introducing Ar or H2 at the flow rate of 0.5-1.5 L/min, heating the reactor to 300-700° C., and fluidizing for 5-90 min to modify the titanium powders. When filled with high-purity argon gas and heated at high temperature, the sharp edges and corners of irregularly-shaped titanium powders are ground collision of the particles due to the friction among powder particles.