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Method for brazing ceramic and metal by adopting composite high-entropy alloy solder

A technology of high-entropy alloys and composite solders, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve problems affecting the mechanical properties of brazed joints, the type, quantity, shape, and distribution of brittle intermetallic compound phases , to achieve the effect of short cycle, simple operation and favorable mass production

Inactive Publication Date: 2017-11-21
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of Si, Cu, Mg and other elements, a large number of brittle intermetallic compounds appear in the ceramic-metal joint after reacting with the ceramic matrix. It is difficult to effectively control the type and quantity of brittle intermetallic compound phases by optimizing the welding process. , morphology and distribution, which largely affect the mechanical properties of brazed joints

Method used

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  • Method for brazing ceramic and metal by adopting composite high-entropy alloy solder

Examples

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Effect test

Embodiment 1

[0027] A method for brazing ceramics and metals with composite high-entropy alloy filler metal, the ceramic base material selected is ZrO 2 Ceramics, the sample size is 5×5×10mm, the metal is Ti-6Al-4V, the specific composition is: Al6.0%, V3.5%, and the rest is Ti. The sample size is 10×10×30mm, the thickness of high-entropy alloy AlNiCu foil is 100μm, and the thickness of titanium foil is 50μm. The width is 5mm.

[0028] After polishing the ceramic and titanium alloy substrates to be welded with 400-mesh, 600-mesh, and 800-mesh water-resistant sandpaper, the substrates were polished with 0.5M diamond grinding fluid, cleaned in acetone and ultrasonic waves for 20 minutes, and dried for later use. , wash the high-entropy alloy foil and titanium foil in acetone for 20 minutes to remove oil and impurities on the surface of the solder, and dry them for use.

[0029] After assembling the treated substrate and the composite high-entropy solder foil, a pressure of 0.01 MPa was app...

Embodiment 2

[0033] A method for brazing ceramics and metals with composite high-entropy alloy filler metal, the ceramic base material selected is Si 3 N 4 The ceramic sample ruler is 5×5×10mm, and the metal is 304 stainless steel. The sample size is 10×10×30mm, the thickness of high-entropy alloy AlNiCu foil is 100 μm, and the thickness of titanium foil is 50 μm. The width is 5mm.

[0034] After the ceramics to be welded and 304 stainless steel are polished with 400 mesh, 600 mesh, and 800 mesh water-resistant sandpaper, respectively, the substrate is polished with 0.5M diamond abrasive liquid, placed in acetone, cleaned by ultrasonic waves for 20 minutes, and dried for use. Wash the high-entropy alloy foil and titanium foil in acetone for 20 minutes to remove oil and impurities on the surface of the solder, and dry them for use.

[0035] After assembling the treated substrate and the composite high-entropy solder alloy foil, a pressure of 0.02 MPa was applied on the metal to ensure th...

Embodiment 3

[0039] A method for brazing ceramics and metals with composite high-entropy alloy filler metal, the ceramic base material selected is Al 2 o 3 The ceramic sample size is 5×5×10mm, the metal is Ti-6Al-4V, and the specific composition is: Al6.0%, V3.5%, and the rest is Ti. The sample size is 10×10×30 mm, the thickness of the high-entropy alloy AlNiCu foil strip is 100 μm, and the thickness of the titanium foil is 50 μm. The width is 5mm.

[0040] Will be welded Al 2 o 3 The ceramics and Ti-6Al-4V alloy were polished with 400 mesh, 600 mesh, and 800 mesh water-resistant sandpaper respectively, and then the substrate was polished with 0.5M diamond abrasive liquid, cleaned in acetone and ultrasonic wave for 20 minutes, and dried for later use. Wash the high-entropy alloy foil and titanium foil in acetone for 20 minutes to remove oil and impurities on the surface of the solder, and dry them for use.

[0041] After assembling the treated substrate and the composite high-entropy ...

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Abstract

The invention relates to a method for brazing ceramic and metal by adopting a composite high-entropy alloy solder, and solves the problem of poor joint performance due to that a lot of brittle intermetallic compounds are generated on the joint surface during the ceramic and metal brazing process. The composite high-entropy alloy solder comprises an upper layer and a lower layer, wherein the upper layer is a high-entropy alloy foil band close to one side of the metal, and the lower layer is titanium foil close to one side of the ceramic. The method comprises the following steps: cleaning a substrate to be welded and the solder foil band, assembling a sandwich structure, applying a pressure of 0.01-0.03 MPa on the sandwich structure to ensure that the substrate can be in full contact with the solder layer, and placing the assembled part in a vacuum diffusion furnace for brazing after the completion of assembly. The method for brazing ceramic and metal by adopting the composite high-entropy alloy solder has the benefits as follows: the operation is simple, the high-entropy effect of the high-entropy alloy is utilized, an FCC and BCC solid solution structure is formed in the brazing seam, no brittle intermetallic compound is generated in the joint, that is, the generation of brittle intermetallic compounds in the joint is effectively suppressed, the reaction between active element Ti and ceramic in titanium foil is utilized, and tough compounds are generated on the joint surface so as to realize the effective metallurgical bonding of ceramic and metal.

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 Background technique [0002] Ceramics have excellent properties such as wear resistance, high temperature resistance, corrosion resistance and high hardness, so they have important applications in aerospace, energy and other fields. However, ceramics have poor toughness at room temperature and are difficult to process into structural parts with complex shapes, which greatly limits the application range of ceramic materials. However, if ceramics and metals are prepared into composite components by using connection technology, the excellent high-temperature performance of ceramic materials can be utilized, and the plasticity and toughness of metal materials can be utilized, thereby effectively expanding the application field of ceramic-metal composite ...

Claims

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Application Information

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IPC IPC(8): B23K1/19B23K1/20B23K1/008
CPCB23K1/19B23K1/008B23K1/206
Inventor 李红黄海新邢增程李云月
Owner BEIJING UNIV OF TECH
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