Laser Welding Process of Molybdenum Group Glass and Kovar Alloy

A technology of laser welding and process method, which is applied in the field of welding, can solve the problems of limited application, poor impact toughness, and low precision, and achieve the effects of avoiding cracking and fusing, reducing post-weld stress, and being suitable for mass production

Active Publication Date: 2020-06-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the connection methods of glass and metal include anodic bonding, brazing, friction welding, electron beam welding, explosive welding, etc., but these methods have defects such as easy aging, low precision, low strength and many pores.
The main problems in the connection between metal materials and glass are: (1) large difference in thermal expansion coefficient, stress concentration, a large number of micro-cracks after welding, and poor joint performance; The method is ionic bond and metal bond, the wettability is very poor, and the interface is difficult to bond; (3) non-metallic materials have poor toughness and are prone to fracture
Glass materials have the characteristics of high strength, high hardness, corrosion resistance, and excellent insulation properties, but the low ductility and poor impact toughness of glass itself limit its application in engineering

Method used

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  • Laser Welding Process of Molybdenum Group Glass and Kovar Alloy
  • Laser Welding Process of Molybdenum Group Glass and Kovar Alloy
  • Laser Welding Process of Molybdenum Group Glass and Kovar Alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Grind the surface of Kovar alloy from 400 mesh to 1200 mesh with sandpaper, smooth the molybdenum group glass with metallographic sandpaper, and clean the surface with acetone and ethanol respectively for 5 minutes. The glass is dried in the furnace;

[0027] (2) The size of the Kovar alloy sample is 40×20×1.1mm, and the vacuum degree is 10 -1 Treat in MPa environment for 5 minutes, and then oxidize in a furnace at a temperature of 650°C for 10 minutes;

[0028] (3) Ni 2 o 3 -MnO 2 -B 2 o 3 Metal oxide powder (the oxide powder mass percentage is composed of: Ni 2 o 3 35%, MnO 2 10%, B 2 o 3 19%, Al 2 o 3 5%, SiO 2 31%) and alcohol mixed evenly, the ratio is 150g / 100ml, the coating solution is coated on the surface of step (2) Kovar alloy, and the thickness of the coating layer is 120 μm; then the Kovar alloy is prepared by sintering in the furnace (4) Put the oxidized Kovar alloy sample on the molybdenum group glass sample (20×15×3mm), and install ...

Embodiment 2

[0034] (1) Grind the surface of the Kovar alloy from 400 mesh to 1200 mesh with sandpaper, smooth the molybdenum group glass with metallographic sandpaper, and clean the surface with acetone and ethanol respectively for 5 minutes. drying in the oven;

[0035] (2) The size of the metal sample is 40×20×1.1mm, and the vacuum degree is 10 -1 Treat in MPa environment for 5 minutes, and then oxidize in a furnace at a temperature of 650°C for 10 minutes;

[0036] (3) Ni 2 o 3 -MnO 2 -B 2 o 3 Metal oxide powder (the oxide powder mass percentage is composed of: Ni 2 o 3 35%, MnO 2 10%, B 2 o 3 19%, Al 2 o 3 5%, SiO 231%) and alcohol mixed evenly, the ratio is 150g / 100ml, the coating solution is coated on the surface of step (2) Kovar alloy, and the thickness of the coating layer is 120 μm; then the Kovar alloy is prepared by sintering in the furnace layer, the temperature is 800°C, and the time is 10min;

[0037] (4) Place the oxidized metal sample on the molybdenum g...

Embodiment 3

[0043] (1) Grind the surface of the Kovar alloy from 400 mesh to 1200 mesh with sandpaper, smooth the molybdenum group glass with metallographic sandpaper, and clean the surface with acetone and ethanol respectively for 5 minutes. drying in the oven;

[0044] (2) The size of the metal sample is 40×20×1.1mm, and the vacuum degree is 10 -1 Treat in MPa environment for 5 minutes, and then oxidize in a furnace at a temperature of 650°C for 10 minutes;

[0045] (3) Ni 2 o 3 -MnO 2 -B 2 o 3 Metal oxide powder (the oxide powder mass percentage is composed of: Ni 2 o 3 35%, MnO 2 10%, B 2 o 3 19%, Al 2 o 3 5%, SiO 2 31%) and alcohol mixed evenly, the ratio is 150g / 100ml, the coating solution is coated on the surface of step (2) Kovar alloy, and the thickness of the coating layer is 130 μm; then the Kovar alloy is prepared by sintering in the furnace layer, the temperature is 800°C, and the time is 10min;

[0046] (4) Place the oxidized metal sample on the molybdenum...

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Abstract

A molybdenum-group glass and Kovar alloy laser welding technique belongs to the technical field of welding and comprises: 1) cleaning glass, removing surface oxide film of Kovar alloy, and decreasing; 2) placing the Kovar alloy in an oxidizing furnace to prepare oxide film and an intermediate layer; 3) mounting a treated weldment in a fixture, and using 'sandwich' welded structure; 4) preheating the fixture and the weldment in the oxidizing furnace; 5) irradiating the metal surface through a laser beam, and performing laser welding after a focus of the laser beam is positioned on the upper surface of metal; 6) after welding, moving the weldment quickly into a furnace for stress annealing, and cooling to room temperature along with the furnace to obtain the glass-metal weldment. By optimizing the laser welding technique, improved shear strength, extended life and improved airtightness are improved for a glass-metal connector, the cost is lowered, and good economy and practicality are achieved.

Description

technical field [0001] The invention relates to the welding process of mesh glass and Kovar alloy by laser welding, which belongs to the field of technical connection between non-metal and metal materials. The process method can be mainly used for welding of vacuum heat collecting tubes and aerospace fields, and belongs to welding technology field. Background technique [0002] With the rapid development of science and technology, glass and metal connection technology can be applied to solar power generation, that is, high-quality solar vacuum heat collectors can be obtained, which can greatly improve the efficiency of solar thermal power generation. At the same time, the sealing technology of glass and metal is proposed higher requirement. [0003] At present, the connection methods of glass and metal include anodic bonding, brazing, friction welding, electron beam welding, explosive welding, etc., but these methods have defects such as easy aging, low precision, low stren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C27/04
CPCC03C27/046
Inventor 栗卓新贾林李红
Owner BEIJING UNIV OF TECH
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