Oxidation behaviors of Ni-Cr-Al superalloy foams at 1 000 °C in air  

作　　者：汤慧萍 王岩 刘咏 李维杰 韩朝 

机构地区：[1]State Key Laboratory of Porous Metals Materials, Northwest Institute for Nonferrous Metal Research [2]School of Aeronautics and Astronautics, Central South University [3]State Key Laboratory of Powder Metallurgy (Central South University) [4]Institute for Superconducting and Electronic Materials, University of Wollongong

出　　处：《Journal of Central South University》2013年第12期3345-3353,共9页中南大学学报（英文版）

基　　金：Project (51134003) supported by the National Natural Science Foundation of China

摘　　要：The oxidation behaviors of Ni-16Cr-xAl （x=4.5%, 9.0%, mass fraction） superalloy foams in air at 1000℃ were investigated. The effects of AI content on the resistance to high temperature oxidation were examined. The oxidation mechanisms of the foams were discussed. The results show that the resistance to the oxidation of the Ni-16Cr-xA1 based alloy at 1 000 ℃ increases with the content of A1 increasing from 4.5% to 9.0%. Complex oxide products are formed on the surface of the superalloy foams after the oxidation. Cr203 and A1203 are the predominant oxides for the scales of the foams with 4.5% A1 and 9% A1, respectively. Excellent high temperature oxidation resistance and superior pore conformation stability for the Ni-16Cr-xA1 based superalloy foam with 9% A1 can be mainly attributed to the formation of relatively continuous and protective A1203 oxides on the surface of the foam.The oxidation behaviors of Ni-16Cr-xAl(x=4.5%, 9.0%, mass fraction) superalloy foams in air at 1 000 °C were investigated. The effects of Al content on the resistance to high temperature oxidation were examined. The oxidation mechanisms of the foams were discussed. The results show that the resistance to the oxidation of the Ni-16Cr-xAl based alloy at 1 000 °C increases with the content of Al increasing from 4.5% to 9.0%. Complex oxide products are formed on the surface of the superalloy foams after the oxidation. Cr2O3 and Al2O3 are the predominant oxides for the scales of the foams with 4.5% Al and 9% Al, respectively. Excellent high temperature oxidation resistance and superior pore conformation stability for the Ni-16Cr-xAl based superalloy foam with 9% Al can be mainly attributed to the formation of relatively continuous and protective Al2O3 oxides on the surface of the foam.

关 键 词：Ni-Cr-A1 based superalloy foam high temperature oxidation oxide scale pore conformation stability 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TB332[金属学及工艺—合金]