论文部分内容阅读
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。
A vacuum cathodic arc deposition process was used to deposit a Mo layer on the inner and outer surfaces of the niobium tungsten alloy nozzle and on the surface of the niobium tungsten alloy specimen. The Mo layer was silicified to form a MoSi2 coating by a vacuum infiltration process. The surface morphology and microstructure of Mo and MoSi2 coatings were analyzed by scanning electron microscopy, energy dispersive spectroscopy, XRD and metallographic microscope. The analysis shows that the phase structure of MoSi2 coating can be roughly divided into outer layer (MoSi2), intermediate layer (NbSi2) and transition layer (Nb5Si3) from the outside to the inside. The results of high temperature oxidation test showed that the static oxidation resistance of MoSi2 coating at 1 800 ℃ in atmospheric environment reached 30 h and it was thermally shocked by 1 376 cycles from room temperature to 1 700 ℃. Test hot test conditions: the engine at a temperature of 1 450 ℃ total work 415s, at 1 610 ℃ for 100 s, the coating condition intact.