机械化学合成Ni2Al3/Al2O3去合金化制备Raney-Ni/Al2O3复合粉体

doi:10.11896/j.issn.1005-023X.2018.06.019

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Abstract Ni₂Al₃/Al₂O₃ powder composites were synthesized by mechanochemical reaction of NiO-Al powder mixtures. Phase evolution and structural development during ball milling were investigated by XRD, SEM equipped with EDS. Ni₂Al₃/Al₂O₃ were leached in 20% sodium hydroxide solution for 2 h,to obtain Ni/Al₂O₃ with the grain size of a nano-scale level. The phase composition and the microstructure were studied by XRD and TEM. The results showed that the phase composition of the NiO-Al powder mixtures remained unchanged after 1 h of ball milling. Mechanochemical reaction between NiO and Al powders under the mechanical forces Ni₂Al₃ and Al₂O₃ were formed after 3 h of balling. The mechanically activated reaction between NiO and Al occurred in sudden. Ni₂Al₃/Al₂O₃ powder composites were formed after 10 h of ball milling. Ni₂Al₃/Al₂O₃ powder composites were etched in a 20% sodium hydroxide solution at 70 ℃ for 2 h and Ni/Al₂O₃powder composites was obtained.

Key words： Raney-Ni de-alloying mechanochemical synthesis Ni₂Al₃

Published: 25 March 2018

CLC number:

TB34

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	Articles by authors
	LIU Diqiang
	JIA Jiangang
	GAO Changqi
	WANG Jianhong

Cite this article:

LIU Diqiang,JIA Jiangang,GAO Changqi, et al. Preparation of Raney-Ni/Al₂O₃ Powder Composites by De-alloying of Mechanochemical Synthesized Ni₂Al₃/Al₂O₃ Powders[J]. Materials Reports, 2018, 32(6): 957-960.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.06.019 OR http://www.mater-rep.com/EN/Y2018/V32/I6/957

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