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目前,超高频管一般用玻璃与金属封接。用陶瓷与金属封接的管子,一般没用对封结构,而是套封和平封结构。这种结构有很大的局限性,要有一定的工艺条件,应用范围窄。大部分玻璃与金属结构管子的技术性能提不高,一般由于真空度不高。为了提高真空度,必须提高烘烤温度,使管子除气彻底。因为玻璃的熔点低,烘烤温度只能加到450℃。温度再加高玻璃要软化,造成管子报废;同时玻璃大量放气,排气时间就要加长。如果把玻璃改成陶瓷,就能达到提高烘烤温度的目的,可是用陶瓷与金属的套封和平封结构,必须改变超高频管的原来设计结构,才能把玻璃改成陶瓷。这样改,
At present, UHF tubes are generally sealed with glass and metal. Pipe sealed with ceramic and metal, the general useless on the seal structure, but the package seal and flat seal structure. This structure has great limitations, to have a certain process conditions, narrow range of applications. Most of the glass and metal structure of the technical performance of the pipe is not high, the general vacuum is not high. In order to increase the degree of vacuum, it is necessary to raise the baking temperature so that the pipe is thoroughly degassed. Because the melting point of glass is low, the baking temperature can only be added to 450 ℃. Temperatures plus high glass to soften, resulting in tube scrap; while a large number of glass deflation, exhaust time will be longer. If you change the glass into ceramic, you can achieve the purpose of improving the baking temperature, but with ceramic and metal sleeve seal structure, you must change the design of the original structure of the UHF tube to glass into ceramic. In this way,