US 11,673,196 B2
Metal material sintering densification and grain size control method
Lin Zhang, Beijing (CN); Xuanhui Qu, Beijing (CN); Xingyu Li, Beijing (CN); Mingli Qin, Beijing (CN); Yanhao Dong, Beijing (CN); Ju Li, Beijing (CN); Guanghua Wang, Beijing (CN); Ying Long, Beijing (CN); and Wei Zhong, Beijing (CN)
Assigned to UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING, Beijing (CN)
Filed by UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING
Filed on Feb. 18, 2020, as Appl. No. 16/793,897.
Application 16/793,897 is a continuation of application No. PCT/CN2018/123568, filed on Dec. 25, 2018.
Claims priority of application No. 201811583483.7 (CN), filed on Dec. 24, 2018.
Prior Publication US 2020/0198013 A1, Jun. 25, 2020
Int. Cl. B22F 3/16 (2006.01); B22F 9/02 (2006.01); B22F 1/05 (2022.01); B22F 1/10 (2022.01); B22F 1/065 (2022.01); B22F 1/142 (2022.01); B22F 9/04 (2006.01)
CPC B22F 3/16 (2013.01) [B22F 1/05 (2022.01); B22F 1/065 (2022.01); B22F 1/10 (2022.01); B22F 1/142 (2022.01); B22F 9/026 (2013.01); B22F 2009/041 (2013.01); B22F 2201/013 (2013.01); B22F 2201/11 (2013.01); B22F 2203/11 (2013.01); B22F 2203/13 (2013.01); B22F 2301/20 (2013.01); B22F 2998/10 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A metal material sintering densification and grain size control method, comprising the following steps:
first, using metal powder as a raw material powder, processing the raw material powder by deagglomeration to obtain deagglomerated powder; granulating the deagglomerated powder by spray granulation and obtain granulated particles in spherical shape; processing the obtained granulated particles by die pressing and cold isostatic pressing to obtain a powder compact; sintering the powder compact by two-step pressureless sintering, wherein a first step of sintering comprises heating up the powder compact to a first temperature, holding the powder compact at the temperature for a first time and controlling a density at 75-85%, and a second step of sintering comprises cooling down the powder compact to a second temperature and holding the powder compact at the second temperature for a second time to further eliminate residual pores, so as to obtain ultrafine grain metal.