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 |
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.
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