Cr含量对NiCrMoCu多孔材料高温氧化行为的影响

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Abstract NiCrMoCu porous material was fabricated by the activation reaction sintering method using Ni, Cr, Mo and Cu element powders as raw materials. X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), energy dispersive spectrum (EDS), pore size tester were conducted to characterize the phase composition, pore morphology, element valence, element content and pore structure of porous materials before and after high temperature oxidation at 800 ℃. The results indicate that the oxidation mass gain and the decrease rate of permeability of NiCrMoCu porous materials show a trend of decreasing first and then increasing with the increases of Cr content. When the Cr content attains 35%, and the oxidation time is 20 h, the smallest mass gain is 7.31 mg/cm, and the rate of decrease in permeability is 23.41%. When Cr mass fraction ranges from 10% to 35%, the surface composition of the material is mainly Cr₂O₃. The Cr content continues to increase to 40%, its oxidizing substances are mainly Cr₂O₃ and NiCr₂O₄. The addition of alloying element Cr is conducive to the formation of a dense Cr₂O₃ thin film on the surface, preventing air from continuing to penetrate the alloy substrate to produce oxidation. However, the Cr content continues to increase, the fluffy structure of NiCr₂O₄is generated to increase the oxidaion.

Key words： NiCrMoCu porous materials permeability high temperature oxidation Cr content

Received: 21 April 2020 Published: 18 September 2020

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	ZOU Haoran
	LI Xide
	ZHANG Chuo
	YANG Junsheng
	HE Yuehui

Cite this article:

ZOU Haoran,LI Xide,ZHANG Chuo, et al. Effect of Cr content on high temperature oxidation behavior of porous NiCrMoCu alloys[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(4): 312-320.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I4/312

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