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High temperature heat-collecting pipe hard glass and Kovar alloy sealing method

A hard glass and heat collecting tube technology, applied in the sealing field of hard glass and Kovar alloy

Inactive Publication Date: 2008-08-13
NANJING SANLE ELECTRONICS INFORMATION IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Method used

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  • High temperature heat-collecting pipe hard glass and Kovar alloy sealing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Referring to Fig. 1, hard glass 1, two transition glass joints 2, 3, and Kovar tube 5 are sequentially sealed (butted). The expansion coefficient of hard glass, two transition glass joints, and Kovar alloy is (32-34)*10 -7 / °C, (39-41)*10 -7 / °C, (46-48)*10 -7 / °C, (50.3-53.7)*10 -7 / °C.

[0012] The heating temperature and holding time for the sealing area between two adjacent sealing parts are as follows:

[0013] seal area

Heating temperature °C

Sealing zone 12 between hard glass 1 and transition glass joint 2

900-1250

The sealing area 23 between the transition glass joint 2 and the transition glass joint 3

600-900

The sealing area 35 between the transition glass joint 3 and the Kovar tube 5

500-800

[0014] The heating temperatures of the sealing areas 12, 23, and 35 are gradually reduced, and the heating temperature difference of each sealing area is 250-300°C;

[0015] The combustion gas for sealing t...

Embodiment 2

[0020] The difference between embodiment 2 and embodiment 1 is that the heating temperatures of the sealing areas 12, 23, and 35 are different, and the heating temperature difference of each sealing area is 50-100°C, as shown in the following table:

[0021] seal area

[0022] For the high-temperature heat collecting tube of this embodiment, a tensile test is carried out, and the tensile strength reaches 700 kg. In the fatigue test, the stretching cycle was more than 38,000 times. Carry out small batch production, and the finished product rate reaches 88%.

Embodiment 3

[0024] The difference between Embodiment 3 and Embodiment 1 is that the heating temperatures of the sealing areas 12, 23, and 35 are different, and the heating temperature difference of each sealing area is 100-200°C, as shown in the following table:

[0025] seal area

[0026] For the high-temperature heat collecting tube of this embodiment, a tensile test was carried out, and the tensile strength reached 760 kg. In the fatigue test, the stretching cycle was more than 44,000 times. Carry out small batch production, and the finished product rate reaches 92%.

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Abstract

An objective of the invention is to provide a sealing method which has high reliability and practicability and is used between the high-temperature thermal-collecting tube hard glass and the metal. The method adopts one or more than one transition glass joint to do transition sealing, the expansion factor of the hard glass, transition glass joint and the kovar which are sealed in sequence gradually increases, the difference value of the expansion factor of the adjacent two sealing pieces is (6- 11)* <-7> / DEG C; when the adjacent two sealing pieces are sealed the heating temperature of the sealing area is 500-1500 DEG C, and the temperature is kept for 5-30min; from the hard glass to the kovar the heating temperature of each sealing area is 50-300 DEG C; and the hard glass, transition glass joint and the kovar which are executed with sealing are done with stress-relieving annealing.

Description

technical field [0001] The invention relates to the sealing of hard glass and metal (kovar alloy) in high-temperature heat collecting tubes, in particular to the sealing method of hard glass and kovar alloy. Background technique [0002] High-temperature collector tube refers to a collector tube that can meet the working requirements of 400°C and withstand the temperature impact of -50-400°C. It is the core device for manufacturing solar thermal power generation. It is mainly composed of a hard glass shell with high light transmission, a metal (kovar alloy) inner tube covered with a heat-absorbing coating, an expansion joint with a good length compensation function, and connecting flanges for inner and outer tubes. The expansion coefficient of hard glass is generally (27-35)*10 -7 For high boron glass at / ℃, the expansion coefficient of Kovar alloy is generally (50.3-53.7)*10 -7 / °C (in the case of (30-450)°C). [0003] At present, in the manuf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C29/00
Inventor 张沪基王俊毅钱新荣王娟高迎春潘生云
Owner NANJING SANLE ELECTRONICS INFORMATION IND GRP
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