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Welding flux for quickly welding heterogeneous ceramics at low temperature

A fast welding and soldering technology, applied in the field of welding, can solve problems such as direct welding, and achieve the effects of high-efficiency welding, thermal stress relief, and low welding temperature

Active Publication Date: 2021-01-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difference in microstructure between the two materials, direct welding with electric field-assisted methods is not possible

Method used

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  • Welding flux for quickly welding heterogeneous ceramics at low temperature
  • Welding flux for quickly welding heterogeneous ceramics at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a) mixing 3% yttrium oxide-stabilized zirconia powder with a mass fraction of 1% magnesia-doped alumina powder at a mass ratio of 50%:50%, and then compressing the resulting mixed powder, Sinter at 1500°C to obtain the desired solder.

[0020] b) polishing the surfaces of the solder, zirconia and alumina ceramics obtained in step a) to 10 μm;

[0021] c) the surface of the sample obtained in step b) is closely attached together, and a pressure of 2MPa is applied;

[0022] d) heating the sample obtained in step c) to 1200°C;

[0023] e) Apply an electric field intensity of 800V / cm to the sample obtained in step d), and a current density of 5mAmm –2 , and keep it for 30s to complete the welding between the samples.

[0024] Conclusion: By using the solder with a mass ratio of zirconia and alumina of 50%:50%, the high-efficiency welding of zirconia and alumina is realized, and the welding effect is good.

Embodiment 2

[0026] a) The mass fraction is 3% yttrium oxide stabilized zirconia powder and the mass fraction is 1% magnesia doped alumina powder according to the mass ratio of 20%:80%, and then the resulting mixed powder is pressed into shape , Sintered at 1450 ° C to obtain solder.

[0027] b) polishing the surfaces of the solder, zirconia and alumina ceramics obtained in step a) to 5 μm;

[0028] c) the surface of the sample obtained in step b) is closely attached together, and a pressure of 2MPa is applied;

[0029] d) heating the sample obtained in step c) to 1200°C;

[0030] e) Apply an electric field intensity of 800V / cm to the sample obtained in step d), and a current density of 5mAmm -2 , and keep it for 30s to complete the welding between the samples.

[0031] Conclusion: By using the solder with a mass ratio of zirconia and alumina of 20%:80%, the high-efficiency welding of zirconia and alumina is realized, and the welding sample with high solder-alumina interface strength is...

Embodiment 3

[0033] a) The mass fraction is 2% calcium oxide stabilized zirconia powder and the mass fraction is 1% magnesia-doped alumina powder and mixed uniformly at a mass ratio of 40%:60%, and then the resulting mixed powder is pressed into shape , Sintered at 1550 ° C to obtain solder.

[0034] b) polishing the surfaces of the solder, stabilized zirconia and alumina ceramics obtained in step a) to 1 μm;

[0035] c) The surface of the sample obtained in step b) is closely attached together, and a pressure of 1 MPa is applied;

[0036] d) heating the sample obtained in step c) to 1300°C;

[0037] e) Apply an electric field intensity of 750V / cm to the sample obtained in step d), and a current density of 10mAmm -2 , and keep it for 10s to allow welding between samples.

[0038] Conclusion: By using the solder with a mass ratio of zirconia and alumina of 40%:60%, the high-efficiency welding of zirconia and alumina is realized, and the welding effect is good.

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Abstract

The invention relates to a welding flux for quickly welding heterogeneous ceramics at low temperature under the assistance of an electric field, and belongs to the field of welding. According to the welding flux, rare earth stabilized zirconia and magnesium oxide doped aluminum oxide powder are uniformly mixed, pressed, formed and sintered, and then the welding flux is obtained. Wherein the mass ratio of zirconium oxide to aluminum oxide in the welding flux is 2: 8 to 8: 2; the sintering temperature is 1450 DEG C to 1550 DEG C. According to the welding flux for quickly welding heterogeneous ceramics at low temperature under the assistance of an electric field, efficient welding between zirconium oxide and aluminum oxide heterogeneous ceramic is achieved; the welding rate can be controlledby adjusting the concentration of dopants in the welding flux; and meanwhile, the strength of a welding interface can be regulated and controlled by regulating the composition of the welding flux. Besides, due to the fact that the welding flux is used, the welding temperature is low, the welding time is short, the thermal stress of a welding sample is eliminated, and the welding strength is improved.

Description

technical field [0001] The invention relates to a solder used for low-temperature rapid welding of heterogeneous ceramics, which belongs to the field of welding. Background technique [0002] Welding between heterogeneous ceramics is of great significance for expanding its application range and meeting actual needs to a greater extent. Such as zirconia (ZrO 2 ) and alumina (Al 2 o 3 ) ceramics as typical oxide ceramics have been valued in the field of engineering technology, and the welding between them has been widely used in aviation, transportation and energy fields ("T.Nagano, H.Kato, Diffusion Bonding of Zirconia / Alumina Composites. Journal of the American Ceramic Society, 73 [11] (1990) 3476–3480" "M. Boniecki, D. Kaliński, Z. Librant, W. Superplastic joining of aluminum and zirconia ceramics. Journal of the European Ceramic Society. 27(2007) 1351–1355"). ZrO 2 Ceramics are widely used in industry, aerospace and biomedical fields because of their excellent mechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/00C04B35/48C04B35/10C04B35/622
CPCC04B37/003C04B35/48C04B35/10C04B35/622C04B2235/3217C04B2235/3244
Inventor 王一光夏军波
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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