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A Laser Welding Method for Joining Molybdenum Group Glass/Kovar Alloy by Adding Mo-Mn–Ni Metal Interlayer

An intermediate layer and laser welding technology, which is applied in the field of laser welding, can solve the problems of large difference in thermal expansion coefficient, poor toughness of non-metallic materials, and difficult interface bonding, so as to reduce welding stress, avoid cracking, and avoid cracking and fusing.

Active Publication Date: 2019-04-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the joint strength is low and the brittleness is large, which is greatly limited in practical application.
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
However, these methods have defects such as easy aging, low precision, low strength and many pores.

Method used

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  • A Laser Welding Method for Joining Molybdenum Group Glass/Kovar Alloy by Adding Mo-Mn–Ni Metal Interlayer
  • A Laser Welding Method for Joining Molybdenum Group Glass/Kovar Alloy by Adding Mo-Mn–Ni Metal Interlayer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Grind Kovar alloy from 400 mesh to 1200 mesh, and then perform ultrasonic cleaning in acetone solution for 20 minutes;

[0029] (2) Kovar alloy of 40×20×1.1mm is vacuumed at 10 -1 Treat in MPa environment for 20 minutes, then oxidize in a furnace at 800°C for 10 minutes;

[0030] (3) Place the oxidized Kovar alloy sample on the molybdenum group glass sample (20×15×3mm), add an intermediate layer in the middle, and then place it on the fixture;

[0031] (4) The preheating temperature is 300°C, and the preheating time is 20 minutes;

[0032] (5) The mass percentage of the middle layer is selected as: Mo: 15%, Ni: 54%, Mn: 29%, C: 0.7%, SiO 2 : 1.0%, the PVA additive accounts for 0.3%, and the thickness of the middle layer is 80 μm;

[0033] (6) Laser model: YLS-3000-SM, laser parameters: laser power 700W, welding speed 4.5mm / s, gas flow 15L / min;

[0034] (7) The post-weld heat treatment temperature is 350°C, and it is cooled with the furnace;

[0035] According t...

Embodiment 2

[0037] (1) Grind Kovar alloy from 400 mesh to 1200 mesh, and then perform ultrasonic cleaning in acetone solution for 20 minutes;

[0038] (2) Kovar alloy of 40×20×1.1mm is vacuumed at 10 -1 Treat in MPa environment for 20 minutes, then oxidize in a furnace at 800°C for 10 minutes;

[0039] (3) Place the oxidized Kovar alloy sample on the molybdenum group glass sample (20×15×3mm), add an intermediate layer in the middle, and then place it on the fixture;

[0040] (4) The preheating temperature is 300°C, and the preheating time is 20 minutes;

[0041] (5) The mass percentage of the middle layer is selected as: Mo: 15%, Ni: 54%, Mn: 29%, C: 0.7%, SiO2: 1.0%, PVA additive accounts for 0.3%, and the thickness of the middle layer is 90 μm;

[0042] (6) Laser model: YLS-3000-SM, laser parameters: laser power 700W, welding speed 4.5mm / s, gas flow 15L / min;

[0043] (7) The post-weld heat treatment temperature is 350°C, and it is cooled with the furnace;

[0044] According to the s...

Embodiment 3

[0046] (1) Grind Kovar alloy from 400 mesh to 1200 mesh, and then perform ultrasonic cleaning in acetone solution for 20 minutes;

[0047] (2) Kovar alloy of 40×20×1.1mm is vacuumed at 10-1 Treat in MPa environment for 20 minutes, then oxidize in a furnace at a temperature of 800°C for 10 minutes;

[0048] (3) Place the oxidized Kovar alloy sample on the molybdenum group glass sample (20×15×3mm), add an intermediate layer in the middle, and then place it on the fixture;

[0049] (4) The preheating temperature is 300°C, and the preheating time is 20 minutes;

[0050] (5) The mass percentage of the middle layer is selected as: Mo: 15%, Ni: 54%, Mn: 29%, C: 0.7%, SiO2: 1.0%, PVA additive accounts for 0.3%, and the thickness of the middle layer is 100 μm;

[0051] (6) Laser model: YLS-3000-SM, laser parameters: laser power 700W, welding speed 4.5mm / s, gas flow 15L / min;

[0052] (7) The post-weld heat treatment temperature is 350°C, and it is cooled with the furnace;

[0053] Ac...

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Abstract

The invention relates to a laser welding method for connecting molybdenum-group glass / kovar alloy by adding a Mo-Mn-Ni metal interlayer, and belongs to the technical field of connection of non-metal and metal materials. The method comprises the following steps: cleaning glass, removing a surface oxidation film from kovar alloy, and performing degreasing and deoiling treatment; preparing an oxidation film on the kovar alloy in an oxidizing furnace; preparing a Mo-Mn-Ni interlayer metal powder layer through a tabletting machine; arranging the glass at the bottom layer, the Mo-Mn-Ni interlayer metal powder at the middle layer and the kovar alloy at the top layer to form a sandwich welded structure, enabling the three to be in close contact, putting into a furnace, and preheating; radiating a laser beam onto the surface of the kovar alloy to perform laser welding; and after the welding is finished, quickly transferring the weldment into the heating furnace, performing stress-relief annealing, and cooling to room temperature in the furnace. The method provided by the invention promotes interface wetting, reduces postwelding stress, improves joint strength, lowers production cost and prolongs product service life.

Description

technical field [0001] The invention relates to a laser welding method for connecting molybdenum group glass / Kavar alloy by adding a Mo-Mn-Ni intermediate layer, and belongs to the technical field of connecting non-metal and metal materials. Background technique [0002] 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. As a result, the application of glass-metal composite structure combining the excellent properties of glass and metal was born, and is widely used in microelectronic packaging, batteries, instruments, solar vacuum heat collectors and other fields. [0003] Glass and metal welding are widely used in microelectronic packaging, relays, solar vacuum heat collectors and other occasions that require vacuum airtightness. However, the joint strength is low and the brittleness is high,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C27/04
CPCC03C27/04
Inventor 李红贾林栗卓新李灿
Owner BEIJING UNIV OF TECH
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