论文部分内容阅读
行波管密封垫镍铜合金材料常用粉末冶金方法制备,高温工作一段时间后易因气密性变差而失效。利用扫描电子显微镜(SEM)和X射线能谱仪(EDS)分别对行波管密封垫现用镍铜合金样品的失效原因进行分析,研究发现粉末冶金方法制备的镍铜合金内存在固有孔隙和杂质碳、锰元素,是导致其高温使用条件下气密性变差的主要原因。为了克服粉末冶金镍铜合金的固有缺陷,本实验摸索了电沉积法制备镍铜合金的工艺条件,并利用X射线荧光光谱仪(XRF)和扫描电子显微镜对镍铜合金沉积层成分和组织形貌进行分析。结果表明:电流密度和电解液温度影响镍铜合金沉积层的表面平整度及晶粒大小;电沉积镍铜试样不含其他杂质元素;采用合适的工艺参数可获得相对致密度较高的镍铜合金。
Traveling wave tube nickel-copper alloy gasket materials commonly used in powder metallurgy preparation, high temperature work for a period of time due to deterioration of gas-tight failure. The failure reason of the present copper-nickel alloy samples was analyzed by scanning electron microscope (SEM) and X-ray energy dispersive spectrometer (EDS) respectively. It was found that there are inherent pores in the nickel-copper alloy prepared by powder metallurgy Impurities of carbon, manganese, is the main reason leading to poor gas tightness under high temperature conditions. In order to overcome the inherent defects of powder metallurgy nickel-copper alloy, the experiment explored the process conditions of nickel-copper alloy electrodeposition method, and the use of X-ray fluorescence (XRF) and scanning electron microscopy of nickel-copper alloy deposition layer composition and morphology Analyze. The results show that the current density and electrolyte temperature affect the surface flatness and grain size of nickel-copper alloy deposit. The nickel-copper electrodeposited sample does not contain other impurity elements. The suitable relative density of nickel Copper alloy.