摘要
研究了NbC颗粒增强钴基耐磨材料在950~1050℃空气中的氧化行为。合金在950℃下属于抗氧化级,1000℃下属于次抗氧化级,1050℃下属于弱抗氧化级,氧化动力学曲线基本符合抛物线规律。合金表面形成由CoCr_(2)O_(4)、CoNb_(2)O_(6)、Cr_(2)O_(3)和Al_(2)O_(3)组成的混合氧化物层,基体中块状NbC的优先原位氧化行为造成氧化层厚度不均匀且疏松多孔。经过1050℃,100 h氧化后,氧化层下方基体中形成贫Cr层,导致氧化皮剥落后无法重新形成具有保护作用的连续氧化膜。
The oxidation behavior of NbC particle-reinforced cobalt-based wear-resistant alloy in the air from 950 to 1050℃was investigated.The alloy belongs to the oxidation-resistant level below 950℃,the sub-oxidation-resistant level below 1000℃,and the non-oxidation-resistant level below 1050℃.The oxidation kinetic curves basically comply with the parabolic law.A mixed oxide layer consisting of CoCr_(2)O_(4),CoNb_(2)O_(6),Cr_(2)O_(3),and Al_(2)O_(3) is established on the alloy surface.The preferential in-situ oxidation behavior of the blocky NbC phase in the matrix results in the loose porous oxide layer and a non-uniform thickness.After oxidation at 1050℃for 100 h,a Cr-depletion zone is formed in the matrix below the oxide layer,leading to the inability to re-form a continuous and protective oxide film after oxide peeling.
作者
凌晨
李尚平
刘栋
侯杰
梁湘华
骆合力
Ling Chen;Li Shangping;Liu Dong;Hou Jie;Liang Xianghua;Luo Heli(High Temperature Materials Institute,Central Iron and Steel Research Institute,Beijing 100081,China;Gaona Aero Material Co.,Ltd,Beijing 100081,China;AECC Guiyang Aero-Engine Research Institute,Guiyang 550081,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2023年第5期1708-1716,共9页
Rare Metal Materials and Engineering
基金
国家军品配套项目。
关键词
高温耐磨材料
高温氧化
氧化动力学
wear-resistant materials
high-temperature oxidation
oxidation kinetics
