MoSi_2涂层高温抗氧化性能和微观组织  

Microstructure and High-Temperature Oxidation Resistance of Molybdenum Disilicide Coating

作　　者：陈道勇[1] 贾中华[1] 

机构地区：[1]航天材料及工艺研究所,北京100076

出　　处：《宇航材料工艺》2012年第1期100-104,共5页Aerospace Materials & Technology

摘　　要：采用真空阴极电弧沉积工艺在铌钨合金喷管内、外表面和铌钨合金试样表面沉积了Mo层,采用真空包渗工艺使Mo层硅化生成MoSi2涂层。利用扫描电子显微镜、能谱、XRD、金相显微镜对Mo层和MoSi2涂层表面和断面微观形貌、结构进行了分析。分析表明:MoSi2涂层的相结构由外向内大致可分为外层(MoSi2)、中间层(NbSi2)和过渡层(Nb5Si3)。高温抗氧化试验结果表明:MoSi2涂层在大气环境下1 800℃的静态抗氧化性能达到了30 h,室温至1 700℃循环热震1 376次。考核热试车情况:发动机在温度1 450℃累计工作了415s,在1 610℃工作了100 s,涂层状况完好。The molybdenum Coatings on the surface of niobium-tungsten alloy nozzle and sample was deposited by the vacuum arc plasma deposition method.And the MoSi2 coating was fabricated by the silicon pack cementation.Investigation was made into the morphology,structure and element changing of the surface and cross-section of the molybdenum disilicide coating by XRD,SEM,EDS.The oxidation resistance in staticais are at 1 800℃ and thermal shock from room temperature to 1 700℃ are tested.The results show that the oxidation resistance of at 1 800℃ reach 30 hours,the thermal shock is 1 376 cycles.After engine operates 415 s at 1 450℃,and 100 s at 1 610℃,the coating is not broken.

关 键 词：铌钨合金 喷管 Mo层 包渗 MoSi2涂层 高温抗氧化 发动机 

分 类 号：TG174.4[金属学及工艺—金属表面处理]