摘要
在Mo-12Si-8.5B-(8Cr)两种合金表面包埋渗制备硅化钼涂层,以改善Mo-12Si-8.5B合金的高温抗氧化性能,分析了材料的微观组织结构及其高温氧化行为。结果表明:通过包埋渗技术在Mo-12Si-8.5B合金表面获得了一层致密的硅化物涂层,添加Cr的合金表面硅化物涂层生长速率约是不含Cr合金的2倍。未渗硅处理的合金在800~1200℃的高温抗氧化性能较差。渗硅后Mo-12Si-8.5B和Mo-12Si-8.5B-8Cr合金在1200℃氧化60 h质量仅减少0.22和0.24 mg/cm^2。渗硅处理大幅度地改善了合金的高温抗氧化性能,归因于硅化钼涂层表面连续致密氧化膜的形成。
In order to improve the oxidation resistance of Mo-12 Si-8.5 B-（8 Cr） alloys at high temperature in air, silicide coatings were prepared on the surface of Mo-12 Si-8.5 B-（8 Cr） alloys by park cementation method. Then their microstructure and high temperature oxidation behavior were assessed. Results show that continuous and dense silicide coatings were successfully prepared on the surface of Mo-12 Si-8.5 B-（8 Cr） alloys. The growth rate of silicide coating on Mo-12 Si-8.5 B-8 Cr alloy is about two times quicker than that on Mo-12 Si-8.5 B alloy. The bare alloys without silicide coating exhibited poor oxidation resistance at 800-1200 ℃. However the mass gain of Mo-12 Si-8.5 B and Mo-12 Si-8.5 B-8 Cr alloys with silicide coatings oxidized at 1200 ℃ are only 0.22 and 0.24 mg/cm^2, respectively. The oxidation resistance of Mo-12 Si-8.5 B-（8 Cr） alloys was enhanced remarkably after siliconizing, which may be attributed to a continuous and dense Si O2 scale formed on the coating surface.
作者
吴志军
颜建辉
WU Zhijun;YAN Jianhui(School of Design,Hunan University,Changsha 410082,China;Post Doctoral Station,Guangdong Industrial City Co.,LTD.,Shunde 528311,China;School of Material Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2018年第4期419-425,共7页
Corrosion Science and Protection Technology
基金
国家自然科学基金(51475161)
湖南省教育厅科研重点项目(15A059)~~
