A kind of borosilicate glass, glass-metal matching sealing piece and its preparation method and application

Abstract

The invention discloses a borosilicate glass, which is characterized in that it comprises the following components in weight percentage: B2O3 10.0%, Al2O3 6.5%, Na2O 6.5%, K2O 1.5%, CaO 0.5%, Li2O 0.5%, The rest is SiO2. The invention also discloses a glass-metal matching sealing piece obtained by matching and welding the glass and Kovar alloy, and a preparation method and application of the sealing piece. The glass of the present invention has strong weather resistance, strong mechanical impact resistance, high solar transmittance, and the average linear expansion coefficient is very close to that of Kovar alloy. The sealing technology is difficult, the preparation process conditions are mild, and it is easy to implement. The obtained glass-metal matching seal has strong weather resistance and can work stably for a long time in the range of room temperature to 300 °C, which meets the requirements of the field of high-temperature vacuum solar collector tubes.

Description

technical field [0001] The present invention relates to a new borosilicate glass and the glass-metal matching sealing part obtained by sealing the glass and metal, and also relates to the preparation method of the sealing part and its application in high-temperature vacuum solar heat collecting tubes, belonging to glass and metal High-temperature vacuum solar collector tube technology field. Background technique [0002] The trough solar thermal power generation system is the breakthrough and focus of promoting the commercial application of the solar thermal power generation system in the world in the near future. The United States once organized a large number of experienced experts to form a working group to evaluate the trough solar thermal power generation system. The result is The trough solar thermal power generation system has low power generation cost and has good technical development potential and market potential. The core component of the trough solar thermal po...

AI Technical Summary

Problems solved by technology

In the early research, in order to reduce the difficulty of sealing, molybdenum group glass and Kovar alloy were used for matching sealing, but the light transmittance and weather resistance of molybdenum group glass are poor, and it is difficult to meet the long-term outdoor work requirements of high temperature vacuum solar collector tubes

Historically, no other matched metal and glass has had a large number of industrial applications

In addition, there is also a lot of research on non-matching sealing technology. SOLEL uses borosilicate 3.3 glass and stainless steel metal ring with wedges for non-matching sealing. Since the average linear expansion coefficient of borosilicate 3.3 glass (3.3 ± 0.1) × 10 -6K-1 (20℃~300℃) and stainless steel expansion coefficient (6~16×10-6 / ℃) differ too much Large, extremely high requirements on the mechanical processing of metal sealing parts and glass-metal sealing technology, and the sealing parts are poor in air tightness and poor in cold and heat shock resistance

Patent 200820124787.2 also discloses a glass-metal hermetic joint, which is welded by non-matching welding technology. Although it can be used at high temperature, the expansion coefficient difference between glass and metal is relatively large, and the wettability is not good. The metal alloy needs to be treated, and the weather resistance and light transmittance of the glass used are difficult to further improve

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