期刊
MATERIALS
卷 12, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/ma12060974
关键词
powder metallurgical nickel-based superalloy; graphene nanosheets; PVA
类别
资金
- National Key R&D Program of China [2018YFB0703400]
- Beijing Municipal Science and Technology Project [Z181100003318001]
- AECC Beijing Institute of Aeronautical Materials
- National Postdoctoral Program for Innovative Talents of China [BX201600010]
In this paper, a wet-chemical based method was adopted to acquire the uniform dispersion of graphene nanosheets (GNSs) in a powder metallurgy nickel-based superalloy (FGH96) to fabricate a new GNSs reinforced FGH96 metal matrix composite. The surface of the FGH96 powder was modified using a hydrophilic surfactant named polyvinyl alcohol (PVA), which has good wettability and strong hydrogen bonding between the -OH groups of PVA and oxygen groups of GNSs such as -COOH, -CHO, and -OH. It was shown that the GNSs displayed much better dispersion uniformity on the PVA modified FGH96 powder than the unmodified one. The existence of PVA improved the adsorptive capacity of the GNSs attached on the powder surface and prevented the agglomeration in the following thermal preparation process. Consequently, the micro-hardness of PVA modified composite with 0.1 wt.% GNSs reached 497.9 HV, 3.4% higher than the unmodified FGH96 alloy. Therefore, this preparation process could act as the foundation of a common strategy for the fabrication of GNSs in metal matrix composites with good dispersion uniformity, which may have great potential application in aerospace applications.
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