Connecting method of C/C composite material and copper or copper alloy

A composite material and connecting method technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of complex preparation method of active coating, high heat treatment temperature, low joint strength, etc., and achieve simple introduction method and bonding strength. High, high joint strength effect

Inactive Publication Date: 2013-06-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the shortcomings of the current C / C composite material and copper or copper alloy connection technology, proposes a C / C composite material and copper or copper alloy connection method, adopts copper-based active brazing connection method, solves the problems in the prior art Existing problems such as complicated active coating preparation method, high heat treatment temperature, and low joint strength

Method used

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  • Connecting method of C/C composite material and copper or copper alloy
  • Connecting method of C/C composite material and copper or copper alloy
  • Connecting method of C/C composite material and copper or copper alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The invention forms a layered transition reaction layer through the physical and chemical reaction of active elements on the surface of the C / C composite material, improves the wettability of the solder and forms a strong interface bond, and realizes the tight connection between the C / C composite material and copper. in:

[0025] 1. The C / C composite material is cut into 15mm×10mm×5mm, and the welding surface is punched and roughened by laser technology. After processing, use TiH 2 Powder (powder particle size 2 Coating, the coating thickness is 40 μm. The thickness of Cu-3.5Si solder foil is 200μm, and the oxygen-free pure copper is processed into 15mm×10mm×5mm.

[0026] 2. Assemble the C / C composite material, Cu-3.5Si solder and oxygen-free pure copper into a sandwich structure in the order of "C / C-solder-copper" and place it in the brazing furnace. When the vacuum reaches 2×10 -3 Pa~5×10 -3 At Pa, heat up to a welding temperature of 1050-1070°C and keep it warm f...

Embodiment 2

[0034] The difference from Example 1 is that

[0035] 1. The C / C composite material is cut into 15mm×10mm×5mm, and the welding surface is punched and roughened by laser technology. After the processing is completed, the surface of C / C is treated with titanium metallization by magnetron sputtering method, and a uniform Ti coating is formed on the surface of C / C with a thickness of 10 μm. The thickness of Cu-3.5Si brazing filler metal foil is 200μm, and the CuCrZr alloy is cut into a size of 16mm×11mm×7mm. In the CuCrZr alloy, by weight percentage, Cr: 0.25-0.65, Zr: 0.08-0.20, and the rest is Cu.

[0036] 2. Assemble the C / C composite material Cu-3.5Si solder and CuCrZr alloy into a sandwich structure in the order of "C / C-solder-copper alloy" and place it in the brazing furnace. When the vacuum reaches 2×10 -3 Pa~5×10 -3 At Pa, heat up to a welding temperature of 1050-1070°C and keep it warm for 5-20 minutes to complete brazing. After the brazing is completed, the temperatur...

Embodiment 3

[0040] The difference from Example 1 is that

[0041] On the basis of the C / C composite material and oxygen-free copper joint (CC / Cu joint, Cu thickness 2mm) obtained in Example 1, the CC / Cu joint and CuCrZr alloy were connected by diffusion welding to obtain a CC / Cu / CuCrZr joint.

[0042] The process parameters of diffusion welding connection are as follows:

[0043] Diffusion welding connection temperature 600~800℃, connection pressure 5~10MPa, connection time 10~60min, vacuum degree 2×10 -3 Pa.

[0044] The performance test of CC / Cu / CuCrZr joints shows that the shear strength at room temperature is as high as 79MPa, and the joint interface remains intact after 50 thermal cycles at 450°C thermal shock test (water quenching), and no interface cracks and peeling off phenomena are found. Excellent shock performance.

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Abstract

The invention relates to a connection method of a C / C composite material and copper or copper alloy, belong to the field of heterogeneous material connection and solving the problems of complex preparation method of an active coating, overhigh heat treatment temperature, low joint strength, and the like in the prior art. According to the method, active elements Ti and Si undergo a physicochemicalreaction on the surface of the CC composite material to form a laminated transitional reaction layer, therefore the wettability of brazing filler metal is improved, stronger interface combination is formed, and tight connection between the C / C composite material and the copper or copper alloy is realized. According to the invention, the connection between the C / C composite material and the copperor copper alloy is realized by adopting the active Cu-Si brazing filler metal, a transitional interface of CC / (TiC+SiC+Ti5Si3) / copper or copper alloy is formed through the physiochemical reaction of active elements Ti and Si on the interface, therefore the combination strength is high; and a welding joint after welding is of a pure copper structure which is beneficial to retarding the thermal stress of a joint through plastic deformation. The invention has the main technical effects that: compared with an active casting method, the connecting method disclosed by the invention has the advantages that: the prepared joint has high strength and excellent thermal shock stability, and the active element Ti and Si are introduced with a simple method.

Description

technical field [0001] The invention relates to a connection method between C / C composite material and copper or copper alloy, which belongs to the field of heterogeneous material connection. Background technique [0002] Carbon fiber reinforced carbon matrix composites (C / C) have low density, low expansion coefficient, high thermal conductivity, ablation resistance, thermal shock resistance and thermal fatigue resistance, and excellent high-temperature mechanical properties, and are used in the ITER nuclear fusion test device The middle faces the plasma first wall material. The first wall material needs to withstand high thermal load and ion bombardment, and the C / C composite material needs to be connected with the heat sink CuCrZr alloy to form a cooling system. Therefore, the joints between C / C composites and CuCrZr are required to have high strength, high thermal conductivity and high thermal shock resistance. However, there are significant differences in physicochemic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/20
Inventor 张劲松沈元勋李正林郝传勇
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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