Cr含量对NiCrMoCu多孔材料高温氧化行为的影响

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摘要以Ni、Cr、Mo、Cu元素粉末为原料,采用活化反应烧结方法制备NiCrMoCu多孔材料。利用X射线衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱(XPS)、能谱仪(EDS)、孔径测试仪等手段表征多孔材料在800 ℃高温氧化前后的物相组成、孔隙形貌、元素价态、元素含量及孔结构等。结果表明：NiCrMoCu多孔材料的氧化质量增加量和透气度下降率随Cr含量增加,呈现先减小后增加的趋势,当Cr含量达到35%时,氧化20h,其质量增加量最小,为7.31 mg/cm²,透气度下降率为23.41%。当Cr含量为10%到35%时,材料表面成分以Cr₂O₃为主,继续增大Cr含量至40%,其氧化物以Cr₂O₃和NiCr₂O₄为主。合金化元素Cr的添加,有利于在表面生成致密Cr₂O₃薄膜,阻止空气继续渗入合金基体产生进一步氧化,Cr含量继续增加,生成蓬松结构的NiCr₂O₄使氧化加重。

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	邹浩然
	李喜德
	张绰
	杨军胜
	贺跃辉

关键词 ： NiCrMoCu, 多孔材料, 透气率, 高温氧化, Cr含量

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

收稿日期: 2020-04-21 出版日期: 2020-09-18

ZTFLH:

TG133.4

基金资助:国家自然科学基金资助项目(51704221,51875418); 武汉轻工大学杰出青年基金资助项目(2018J05)

通讯作者: 杨军胜,讲师,博士。电话：18672769337。E-mail: yangjunsheng2008@163.com

引用本文:

邹浩然, 李喜德, 张绰, 杨军胜, 贺跃辉. Cr含量对NiCrMoCu多孔材料高温氧化行为的影响[J]. 粉末冶金材料科学与工程, 2020, 25(4): 312-320.
ZOU Haoran, LI Xide, ZHANG Chuo, YANG Junsheng, HE Yuehui. Effect of Cr content on high temperature oxidation behavior of porous NiCrMoCu alloys. Materials Science and Engineering of Powder Metallurgy, 2020, 25(4): 312-320.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I4/312

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