The study on degassing behavior of nickel-base superalloy FGH96 powder
LUO Xuejun1，ZHANG Lichong1，LI Zhou1，CHEN Hao2
1Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing
Institute of Aeronautical Materials, Beijing 100095, China； 2The Sixth Representative Office of the Air Force
Armament Department in Beijing, Beijing 101300, China
Abstract：The degassing behavior of nickel-base superalloy FGH96 powder was studied by means of temperature
programmed desorption mass spectrometry (TPD- MS), field emission scanning electron microscopy (FE- SEM)
and X-ray photoelectron spectroscopy (XPS). The results show that under the condition of helium purging, the desorption
of hydrogen (H2), water (H2O), carbon monoxide (CO) and carbon dioxide (CO2) occurres on the surface
of the powder with the increase of degassing temperature. The desorption of hydrogen and carbon monoxide mainly
occurres in the heat preservation stage, and the desorption of water and carbon dioxide mainly occurres in the
heating stage. During the degassing process, oxides such as TiO2, Cr2O3, and Nb2O5 on the powder surface do not
decompose and deoxidize, while hydroxides such as Ni(OH)2 are hydrolyzed and deoxidized to generate Ni element.
The effect of temperature on degassing behavior of the FGH96 superalloy powder is significant. For the
FGH96 superalloy powder used in this study, the degassing temperature is recommended to be 350-450 ℃ within
1 h under helium purging conditions.
2021, Vol. 31 
