With the development of technology, ceramic-to-metal sealings have become more and more popular in the application of vacuum feedthrough, co2 lasers, and printing of circuit boards, high power microwave environment, which requires high purity alumina ceramic transmit microwave power well. It requires the ceramic dielectric constant in a stable range. InSealing ceramic parts have made the parts successfully to meet the customer application requests . There are many metal-ceramic composites such as thyristors and vacuum interrupters used in high vacuum technology(HVDC-high voltage direct current transmission, vacuum technology ). Using primarily aluminum oxide ceramics and various non-ferrous metals, such as OF Cu( oxygen-free copper ) or Nico(nickel-cobalt ), soft magnetic alloys, NiFe (nickel-iron), or stainless steel ( 316L), as connecting agents. As a material–logical connecting technology, both passive and active brazing techniques are used, with this, high-strength composites can be produced which are permanently proof and vacuum-tight in the temperature range from -150℃ up to +500℃.
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