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Application of cesium-tungsten bronze as welding flux for welding sapphire

A cesium tungsten bronze, a technology using cesium tungsten bronze, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of large stress in welding structure, large difference in thermal expansion coefficient, and decrease in bending strength of joints

Active Publication Date: 2021-06-15
CHANGZHOU VOCATIONAL INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if metal solder is used, the weld will be opaque, and due to the large difference in thermal expansion coefficient between the metal and sapphire, a large stress will be generated inside the welded structure, which will reduce the bending strength of the weld and even cause cracks
If glass solder is used, the bending strength of the joint will decrease, and the glass is prone to generate a large number of bubbles under laser heating conditions, further reducing the bending strength and light transmission performance of the joint. In brazing using other methods of heating, the glass can be better. Achieves wetting and bonding, but insufficient joint strength due to glass itself having lower strength than sapphire

Method used

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  • Application of cesium-tungsten bronze as welding flux for welding sapphire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Carry out surface polishing treatment to the cut sapphire wafer, make the sapphire surface roughness Ra be 3.000nm.

[0047] (2) The chemical formula of 55wt% is Cs 0.7 WO 3 The cesium tungsten bronze is mixed with the ethanol of 45wt%, obtains the cesium tungsten bronze slurry;

[0048] (3) Coating the cesium tungsten bronze slurry on the surface of the sapphire to be welded, and facing the two sapphire surfaces to be welded, and applying pressure so that the thickness of the cesium tungsten bronze in the weld seam is 30 μm;

[0049] (4) Use a molybdenum jig to clamp the sapphire, apply a pressure of 20N to the sapphire to be welded, set the heating target temperature of the heater to 800°C, heat up at a rate of 5°C / min, use a wavelength of 1050nm, a laser spot diameter of 2mm, and a power of 5000W The infrared laser is irradiated to the weld through one side of the sapphire for 5s, and then the power of the infrared laser is reduced at a rate of 200W / s until the...

Embodiment 2

[0053] (1) Carry out surface polishing treatment to the cut sapphire wafer, make the sapphire surface roughness Ra be 4.000nm.

[0054] (2) the chemical formula of 97wt% is Cs 0.8 WO 3 The cesium tungsten bronze is mixed with the ethanol of 3wt%, obtains the cesium tungsten bronze slurry;

[0055] (3) Coating the cesium tungsten bronze slurry on the sapphire surface to be welded, and facing the two sapphire surfaces to be welded, and applying pressure so that the thickness of the cesium tungsten bronze in the weld seam is 80 μm;

[0056] (4) Use a molybdenum jig to clamp the sapphire, apply a pressure of 50N to the sapphire to be welded, set the heating target temperature of the heater to 1200°C, heat up at a rate of 10°C / min, use a wavelength of 1050nm, a laser spot diameter of 10mm, and a power of 8000W The infrared laser irradiates the weld through one side of the sapphire for 30s, and then reduces the power of the infrared laser at a rate of 200W / s until the power of the...

Embodiment 3

[0060] (1) Carry out surface polishing treatment to the cut sapphire wafer, make the sapphire surface roughness Ra be 5.000nm.

[0061] (2) the chemical formula of 97wt% is Cs 0.8 WO 3 The cesium tungsten bronze is mixed with the ethanol of 3wt%, obtains the cesium tungsten bronze slurry;

[0062] (3) Coating the cesium tungsten bronze slurry on the sapphire surface to be welded, and facing the two sapphire surfaces to be welded, and applying pressure so that the thickness of the cesium tungsten bronze in the weld seam is 70 μm;

[0063] (4) Mount the sapphire with a molybdenum fixture, apply a pressure of 300N to the sapphire to be welded, set the heating target temperature of the heater to 700°C, heat up at a rate of 8°C / min, use a wavelength of 1050nm, a laser spot diameter of 3mm, and a power of 4000W The infrared laser is irradiated to the weld through one side of the sapphire for 20s, and then the power of the infrared laser is reduced at a rate of 200W / s until the pow...

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Abstract

The invention provides an application of cesium-tungsten bronze as a welding flux for welding sapphire, and belongs to the technical field of sapphire welding. According to the invention, the cesium-tungsten bronze is filled in a sapphire welding seam, so that the absorption efficiency of the welding seam on laser energy can be increased, then local heating for the sapphire welding seam is realized, and then welding for the sapphire is completed; and meanwhile, the sapphire is also an oxide and can be mutually dissolved with the cesium-tungsten bronze to a certain extent, in an infrared laser transillumination welding process, the sapphire at a welding seam joint is melted, the cesium-tungsten bronze is dissolved into the sapphire, so that the spatial distribution density of the sapphire is reduced, the light energy absorption energy density of the welding seam is reduced until the absorbed light energy is not enough to keep the sapphire in the volume of the welding seam in a molten state, the sapphire welding seam is solidified, and the welding process is completed.

Description

technical field [0001] The invention relates to the technical field of sapphire welding, in particular to the application of cesium tungsten bronze as solder for welding sapphire. Background technique [0002] Sapphire is mainly composed of α-Al 2 o 3 It has the advantages of high hardness, high melting and boiling point, and high wear resistance. At the same time, due to its good light transmission and low scattering rate of transmitted light, it has been widely used in medical equipment, aerospace, military industry and other fields, such as for making observation windows of aviation equipment. At the same time, the demand for large-size sapphire wafers with a length and width of more than 300 mm is increasing day by day in related fields. At present, the maximum diameter of sapphire wafer products after manual slicing is about 300mm, and the square window is processed into a square window with a side length of only about 200mm, which cannot meet the size requirements o...

Claims

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Application Information

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IPC IPC(8): B23K35/24B23K26/21B23K26/324
CPCB23K35/24B23K26/21B23K26/324
Inventor 李书齐崔炜赵汉宇殷文建蒋伟成
Owner CHANGZHOU VOCATIONAL INST OF ENG
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