Glass and kovar connecting structure and low-temperature sintering method

Abstract

The invention discloses a glass and kovar connecting structure. The glass and kovar connecting structure comprises a high-boron solar heat collecting glass tube and a kovar alloy tube, wherein the kovar alloy tube is inserted into the high-boron solar heat collecting glass tube, a micron kovar soldering paste layer is arranged at the joint on the outer side of the kovar alloy tube, a copper plating layer is arranged at the joint on the inner side of the high-boron solar heat collecting glass tube, and the micron kovar soldering paste layer is connected with the copper plating layer and prepared from components in percentage by mass as follows: 60wt%-70wt% of Fe-Co-Ni alloy particles, 20wt%-30wt% of an adhesive and 5wt%-10wt% of 90%-95% ethanol. The technical scheme has beneficial effects as follows: with the creative application of a low-temperature sintering method, micron kovar soldering paste is taken as an intermediate material, glass-kovar sealing connection is realized, and the structure is reliable at high temperature, free of residual stress and good in mechanical property.

Description

technical field [0001] The invention relates to the technical field of solar high-temperature heat collecting tubes, in particular to a connection structure between glass and Kovar and a low-temperature sintering method. Background technique [0002] At present, the known connection methods of glass and Kovar alloy for high-temperature solar collector tubes are mainly high-temperature sealing technology, which can be divided into matching sealing and non-matching sealing. The two mainly use 1000°C flame to uniformly heat the joint between glass and Kovar , so that oxygen atoms diffuse evenly on the metal surface to form metal oxides. This chemical bond is similar to that of silicon dioxide in glass, so it can achieve a better connection state, but the disadvantage is that the temperature is high, and residual stress is formed after sealing. It is easy to make the glass tube burst. [0003] The low-temperature sintering material is mainly used for the connection between diss...

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Problems solved by technology

[0002] At present, the known connection methods of glass and Kovar alloy for high-temperature solar collector tubes are mainly high-temperature sealing technology, which is divided into matching sealing and non-matching sealing. The two mainly use 1000°C flame to uniformly heat the joint between glass and Kovar , so that oxygen atoms diffuse evenly on the metal surface to form metal oxides. This chemical bond is similar to that of silicon dioxide in glass, so it can achieve a better connection state, but the disadvantage is that the temperature is high, and residual stress is formed after sealing. It is easy to make the glass tube burst

[0003] The low-temperature sintering material is mainly used for the connection between dissimilar metals. Generally, the two are connected together by sintering, such as copper-aluminum, copper-silver, etc. However, there is no one that can be used for glass-metal connection. Advanced low-temperature sintering process, glass-Kvarar connection can be achieved at a low temperature of 180°C, and can be used well at 400°C

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