摘要
采用料浆烧结法在钼合金表面制备Mo Si2-Zr B2高温抗氧化涂层,并进行1 670℃静态氧化试验,利用电子探针显微分析仪(EPMA)、扫描电镜(SEM)、能谱分析(EDS)、X线衍射仪(XRD)等对涂层氧化前后的形貌与组织结构进行观察和研究,同时分析了涂层高温防护机制及失效机制。结果表明:涂层为复合多相结构,在高温氧化环境下,涂层表面会形成熔融态的非晶玻璃膜,可有效阻碍氧气向试样内部的进一步扩散,从而提高材料的抗氧化性能;通过静态抗氧化实验证实涂层具有良好的抗氧化性能,在1 670℃下静态抗氧化寿命可达12 h;涂层失效主要包括纵向裂纹萌生贯通至基体和横向裂纹扩展与基体剥离两种失效方式。
MoSi2-ZrB2 coating was successfully fabricated on molybdenum alloy by slurry reaction sintering method to improve oxidation resistance. The isothermal anti-oxidation properties of the coating at 1 670 ℃ in air were evaluated. EPMA,SEM,EDS and XRD were used to evaluate the microstructure and phase composition of the coating during oxidation,and the failure mechanism was identified. The results show that a combined action of multiphase composite coating on the surface of molybdenum alloy results in the formation of a dense protective layer,providing proper protection to further oxidation of the inner matrix. The coating layer performs excellent oxidation resistance,which oxides for about 12 h at 1 670 ℃. The failure mechanisms include longitudinal crack initiation and growth into the matrix and transverse crack growth till the coating peeling from the matrix.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2015年第6期27-31,共5页
Ordnance Material Science and Engineering
基金
总装备部军品配套项目(JPPT-125-032)
湖南省有色研究基金项目(YSZN2013CL07)
关键词
钼合金
高温抗氧化
MoSi2-ZrB2
涂层
molybdenum alloy
oxidation resistance at high temperature
Mo Si2-Zr B2
coating
