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李喜德,刘羽祚,李彬,李菊英,熊烈强,郑晓,杨军胜.Cr含量对NiCrMoCu多孔材料的影响及其造孔机理研究[J].稀有金属材料与工程(英文),2021,50(5):1641~1648.[LI Xide,LIU Yuzuo,LI Bin,LI Juying,Xiong Lieqing,Zheng Xiao and YANG Junsheng.Effect of Cr content on pore morphology and pore-forming mechanism of porous NiCrMoCu alloys[J].Rare Metal Materials and Engineering,2021,50(5):1641~1648.]
Effect of Cr content on pore morphology and pore-forming mechanism of porous NiCrMoCu alloys
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Received:June 28, 2020  
DOI:
Key words: NiCrMoCu alloys  porous material  porosity  diffusion coefficient  pore-forming mechanism
Foundation item:国家自然科学基金(51704221);武汉轻工大学杰出青年基金(2018J05)
Author NameAffiliation
LI Xide,LIU Yuzuo,LI Bin,LI Juying,Xiong Lieqing,Zheng Xiao and YANG Junsheng  
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Abstract:
      Porous NiCrMoCu alloys were fabricated by reactive synthesis sintering technique with Ni, Cr, Mo and Cu element powders as raw materials. Phase composition, the volume expansion ratio, pore structures and pore morphology were characterized and the pore forming mechanism was discussed. The results indicate that the pore size, porosity and volume expansion rate of porous materials increase with the increase of Cr amount. When the Cr content is 30 wt%, the open porosity reaches 42.10%, the total porosity is 48.36%, the volume expansion rate is 12.60%, the average pore size and permeability are 13.32 μm and 96.3 m3?m-2?kpa-1?h-1, respectively. The diffusion rates of Cr, Mo, Cu atoms in different matrix elements at 1150 ℃ are calculated, and the calculation results illustrate that the diffusion rates of Cr atoms in Ni and Cu atoms are 1.61×10-14 m2?s-1 and 8.22××10-13 m2?s-1, respectively, which is higher than the diffusion rates of Mo and Cu atoms. The pore forming mechanism is explored and it is mainly based on the inter-connected pores in the green compacts and the Kirkendall effect due to the different diffusion rates of Cr, Mo and Cu atoms in the nickel substrate.