A connection structure between glass and Kovar and a low-temperature sintering method

Abstract

The invention discloses a connection structure between glass and Kovar, which comprises a high boron glass tube of a solar heat collecting tube and a Kovar alloy tube, the Kovar alloy tube is inserted into the high boron glass tube of a solar heat collecting tube, and the outer side of the Kovar alloy tube is A micron kovar solder paste layer is provided at the joint, and a copper-plated layer is provided on the inner side of the high boron glass tube of the solar heat collector tube, and the micron kovar solder paste layer is connected to the copper-plated layer; the micron kovar solder paste layer It includes Fe-Co-Ni alloy particles, binder and 90-95% alcohol. The mass fraction of each component of the micron kovar solder paste layer is: 60-70 wt% of Fe-Co-Ni alloy particles, 20-30 wt% of binder, 5-10 wt% of 90-95% alcohol. The above-mentioned technical solution of the present invention has the following beneficial effects: the inventive method of using low-temperature sintering uses micron Kovar solder paste as an intermediate material to realize glass-Kovar sealing, which is reliable at high temperature, has no residual stress, and has good mechanical properties.

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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