不同方法制备的螺旋线慢波组件的散热性能的研究

Study of Heat Dissipation of Slow-wave Structure Made by Different Technology

利用电阻温度系数法对几种方法制备的慢波组件散热性能进行了实验研究,结果表明石墨热挤压法、磁控溅射覆膜法及压力扩散焊接法和无变形热挤压法比冷弹压法和传统的缠钼带热挤压法制备的慢波组件散热性能强许多.传统的石墨热挤压法可与无变形热挤压法制备的组件的散热能力相比拟,但石墨热挤压法会引起慢波组件的两次变形,使慢波组件的微波反射点增多增强.压力扩散焊接法制备的慢波组件散热性能比溅射镀膜法制备的慢波组件散热性能稍强,但压力扩散焊接法与溅射镀膜法相比具有更低的微波损耗.这些结果为制备散热性能强的慢波组件提供了有益的实验结果.

By using the method, employing the variation in resistance of helix with temperature, the heat dissipation capability of the helix traveling-wave tube slow-wave structure（SWS） made by several helix assembling methods have been tested. The resuits of this study have demonstrated that four assembling methods, i. e., the graphite wrapping method, the hot insertion method, the sputtering brazing method and the diffusion brazing method have better heat dissipation capability of the SWS than that of the cold compress method and the molybdenum wrapping method . The SWS made by hot insertion method has a smaller microwave reflecting than that of the graphite wrapping method. The diffusion brazing SWS have a little better heat dissipation capability and lower microwave losses than that of the sputtering brazing SWS. These results can lead to improved helix TWT designs and performance.