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Method for compositing high-entropy brazing filler metal coating laser brazed ceramic and metal

A technology of composite solder and high-entropy alloy, which is applied in the field of composite high-entropy alloy solder coating brazing ceramics and metals, can solve the problems of affecting the content of metal components in the brazing seam, reducing joint strength, and long brazing time, etc. Achieve the effect of improving welding quality, small joint deformation and short heating time

Inactive Publication Date: 2018-07-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Feng Jicai of Harbin Institute of Technology and others successfully brazed and connected ZrB2-SiC-C composite ceramics and GH99 nickel-based superalloys using FeCoNiCrCu high-entropy alloys with equimolar ratios under vacuum. However, due to the high melting point of high-entropy alloys, brazing The temperature reached about 1200°C, and the brazing holding time was up to 120 minutes. Due to the long holding time, the atomic diffusion between the matrix and the high-entropy alloy affected the composition of the brazing seam metal to a certain extent, which reduced the strength of the joint.
At present, the preparation technology of high-entropy alloy coating is mostly used for surface modification, but basically not used for brazing, and high-entropy alloy coating is more conducive to brazing, but the melting point of high-entropy alloy is relatively high. If Using conventional brazing methods such as vacuum welding or diffusion welding, the brazing time is long and the efficiency is low

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  • Method for compositing high-entropy brazing filler metal coating laser brazed ceramic and metal
  • Method for compositing high-entropy brazing filler metal coating laser brazed ceramic and metal

Examples

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Effect test

Embodiment 1

[0029] A method for laser brazing ceramics and metals with a composite high-entropy solder coating, the ceramic base material selected is ZrO 2 ceramics. The selected metal is Ti-6Al-4V alloy, and the specific composition is: Al6.0%, V3.5%, and the rest is Ti. The sample size is 2×10×40mm, and the coating is prepared by laser cladding. Pure Ni coating thickness is 20μm, NiCuCoFe 0.25 mn 1.75 The thickness of the high-entropy alloy coating is 40 μm.

[0030] After polishing the Ti-6Al-4V substrate to be welded with 400 mesh, 600 mesh, and 800 mesh water-resistant sandpaper, the substrate was polished with 0.5M diamond abrasive liquid, and the ZrO 2 Ceramics and Ti-6Al-4V alloy were placed in acetone and ultrasonically cleaned for 20 minutes to remove oil and impurities on the surface of the solder, and dried for later use.

[0031] After the processed substrate is assembled, it is fixed on a jig to ensure the stability of the brazing specimen.

[0032] Before welding, pla...

Embodiment 2

[0035] A method for laser brazing ceramics and metals with a composite high-entropy solder coating, the ceramic base material selected is Si 3 N 4The ceramic sample scale is 2×10×40mm, the metal is GH4169 alloy, the sample size is 2×10×40mm, the coating is prepared by supersonic spraying, the thickness of the pure Ni coating is 20 μm, and the thickness of the high-entropy alloy coating is 40 μm .

[0036] After the GH4169 alloy substrate to be welded was polished with 400 mesh, 600 mesh, and 800 mesh water-resistant sandpaper, the substrate was polished with 0.5M diamond abrasive liquid, and the ZrO 2 The ceramics and Ti-6Al-4V alloy were cleaned in acetone for 20 minutes to remove oil and impurities on the surface of the solder, and dried for use.

[0037] After the processed substrate is assembled, it is fixed on a jig to ensure the stability of the brazing specimen.

[0038] Before welding, place the weldment in a high-temperature resistance furnace to preheat at 30°C / mi...

Embodiment 3

[0041] A method for laser brazing ceramics and metals with a composite high-entropy brazing material coating. The ceramic base material selected is SiC ceramics. The sample size is 2×10×40mm, and the metal is Ti-6Al-4V alloy. .0%, V3.5%, and the rest is Ti. The sample size is 2×10×40mm, and the coating is prepared by laser cladding. The thickness of the pure Ni coating is 20 μm, NiCuCoFe 0.25 mn 1.75 The thickness of the high-entropy alloy coating is 40 μm.

[0042] After grinding the Ti-6Al-4V alloy to be welded with 400 mesh, 600 mesh, and 800 mesh water-resistant sandpaper, the substrate was polished with 0.5M diamond abrasive liquid, and the ceramic with composite coating and Ti-6Al-4V The alloy is placed in acetone and ultrasonically cleaned for 20 minutes to remove oil and impurities on the surface of the solder, and dried for use.

[0043] After the processed substrate is assembled, it is fixed on a jig to ensure the stability of the brazing specimen.

[0044] Befor...

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Abstract

The invention relates to a method for compositing high-entropy brazing filler metal coating laser brazed ceramic and metal and solves the problem of poor joint performance due to the fact that a largenumber of brittle intermetallic compounds are produced in joints during vacuum brazing of ceramic-metal with traditional brazing filler metal. A composite high-entropy alloy brazing filler metal coating is prepared on a ceramic matrix with a laser cladding or supersonic spray technology, the lower layer is a metal Ni coating, and the upper layer is a high-entropy alloy coating. After the coatingis prepared, the to-be-brazed ceramic matrix and metal are assembled into a lap joint structure after ultrasonic cleaning, and a fiber laser is used as a heat source to braze ceramic and metal under protection of argon. The method is simple to operate, laser is used as the heat source, the welding time is shortened, and the welding efficiency is improved. Meanwhile, brittle intermetallic compoundsdo not exist in brazing seams under the high entropy effect of the high-entropy alloy, and the strength and toughness of the joint are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of connection of dissimilar materials, and in particular relates to a method for brazing ceramics and metals with composite high-entropy alloy brazing material coating Background technique [0002] Ceramics is the earliest artificial material invented by mankind, and it plays an important role in the long history of human development. Ceramic materials have a series of good physical and chemical properties such as high strength, hardness, good wear resistance and corrosion resistance, and play an important role in the fields of machinery, metallurgy, aerospace, and medicine. However, with the development of modern industry, materials are required to work reliably under more harsh conditions, so high brittleness and low ductility, as a major disadvantage of ceramic materials, are infinitely magnified. Due to the difficulty of processing into parts with complex structures, the use of ceramic materials in the ...

Claims

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Application Information

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IPC IPC(8): C04B37/02C04B35/64
CPCC04B37/023C04B35/64C04B2235/665C04B2237/12C04B2237/52C04B2237/555
Inventor 李红黄海新胡安明刘旭升
Owner BEIJING UNIV OF TECH
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