The vacuum electronic device is the key components widely used in the fields of radar, navigation, electronic warfare and so on. Multi-brazing process is adopted in the manufacturing, and the leakage is easy to happen...The vacuum electronic device is the key components widely used in the fields of radar, navigation, electronic warfare and so on. Multi-brazing process is adopted in the manufacturing, and the leakage is easy to happen at many parts, such as brazed seams and base materials of tube shell, leading breakage of the devices. But now the brazing filler metal used in the stockage of vacuum electronic devices is very seldom. For the safe of vacuum electronic devices, stockage temperature must be lower than the brazing temperature. Gallium is liquid at room temperature, and has a lower vapor pressure. The Ga-based alloy can diffuse with the high melting point metal, and then form heat-resistance and a good sealing performance of solid-state alloys. In this study three kinds of Ga-based alloys used for the stockage were developed. The diffusion brazing for the stockage on three materials with defect, such as OFHC, kovar and Ag-Cu brazed seams was carried out. The influence factors such as parent materials, brazing filler metal and brazing temperature on the stockage quality were discussed. The results indicated that parent materials, brazing filler metals and brazing temperature had obvious influences on stockage. For OFHC and Ag-Cu filler with defects, the stockage effects were better than kovar. The effect of Ga-In-Cu alloy was the best because the compact diffusion layer was formed between the stockage brazing materials and base materials. As the brazing temperature went up, the diffusion layer formed between stockage material and OFHC, kovar became obviously thicker, the stockage effect got better. For Ag-Cu brazing seams, the stockage effect was satisfactory at 500 ℃, erosion will happen at the higher temperature.展开更多
普通型不锈钢化学研磨液无法消除毛刺、保证零件精密公差尺寸和表面粗糙度,严重影响高真空电子器件金属零件的使用性能.确定了一套完整的54cm FS高真空电子器件金属零件化学研磨工艺.介绍了该工艺的工艺流程及工艺规范.讨论了化学研磨...普通型不锈钢化学研磨液无法消除毛刺、保证零件精密公差尺寸和表面粗糙度,严重影响高真空电子器件金属零件的使用性能.确定了一套完整的54cm FS高真空电子器件金属零件化学研磨工艺.介绍了该工艺的工艺流程及工艺规范.讨论了化学研磨原理及金属哑光表面控制.测量了54 cm FS高真空电子器件金属零件利用该工艺化学研磨后的表面粗糙度、孔直径、显微毛刺尺寸、平面度、孔部真圆度.结果表明,该工艺可以使零件表面达到哑光状态、保证精密公差尺寸、改善表面平整度、促进零件孔的真圆度,降低了生产成本,具有较高的推广价值.展开更多
基金National Nature Science Foundation of China (51033026)
文摘The vacuum electronic device is the key components widely used in the fields of radar, navigation, electronic warfare and so on. Multi-brazing process is adopted in the manufacturing, and the leakage is easy to happen at many parts, such as brazed seams and base materials of tube shell, leading breakage of the devices. But now the brazing filler metal used in the stockage of vacuum electronic devices is very seldom. For the safe of vacuum electronic devices, stockage temperature must be lower than the brazing temperature. Gallium is liquid at room temperature, and has a lower vapor pressure. The Ga-based alloy can diffuse with the high melting point metal, and then form heat-resistance and a good sealing performance of solid-state alloys. In this study three kinds of Ga-based alloys used for the stockage were developed. The diffusion brazing for the stockage on three materials with defect, such as OFHC, kovar and Ag-Cu brazed seams was carried out. The influence factors such as parent materials, brazing filler metal and brazing temperature on the stockage quality were discussed. The results indicated that parent materials, brazing filler metals and brazing temperature had obvious influences on stockage. For OFHC and Ag-Cu filler with defects, the stockage effects were better than kovar. The effect of Ga-In-Cu alloy was the best because the compact diffusion layer was formed between the stockage brazing materials and base materials. As the brazing temperature went up, the diffusion layer formed between stockage material and OFHC, kovar became obviously thicker, the stockage effect got better. For Ag-Cu brazing seams, the stockage effect was satisfactory at 500 ℃, erosion will happen at the higher temperature.
文摘普通型不锈钢化学研磨液无法消除毛刺、保证零件精密公差尺寸和表面粗糙度,严重影响高真空电子器件金属零件的使用性能.确定了一套完整的54cm FS高真空电子器件金属零件化学研磨工艺.介绍了该工艺的工艺流程及工艺规范.讨论了化学研磨原理及金属哑光表面控制.测量了54 cm FS高真空电子器件金属零件利用该工艺化学研磨后的表面粗糙度、孔直径、显微毛刺尺寸、平面度、孔部真圆度.结果表明,该工艺可以使零件表面达到哑光状态、保证精密公差尺寸、改善表面平整度、促进零件孔的真圆度,降低了生产成本,具有较高的推广价值.