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A process for brazing SIC-based composite materials using brazing materials

A brazing material and composite material technology, applied in welding/cutting media/materials, welding media, manufacturing tools, etc., can solve the problem that the working temperature of the joint cannot exceed 500 ℃, and achieve stable and reliable brazing process and stable and reliable connection Joints, effect of stabilizing high temperature resistance

Active Publication Date: 2018-08-31
江苏元沣机械设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the solder systems reported more are mainly Cu-Ti, Ag-Cu-Ti, etc., but the temperature of the joints brazed by this type of solder should not exceed 500 °C

Method used

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  • A process for brazing SIC-based composite materials using brazing materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The sample size of the SiC-based composite material of the present invention is 3mm×4mm×20mm, and the surface to be brazed is 3mm×4mm in section.

[0019] The composition and content of the solder: Co40.5%, Ni 11.5%, Nb26.7%, V21.3%, and the thickness of the solder is 100 μm.

[0020] The preparation method of this solder comprises the steps:

[0021] 1) Weigh high-purity Co, Ni, Nb, V powders (80-100 mesh) in proportion, and mechanically stir until homogenized;

[0022] 2) Weighing 80g of mixed powder and putting it into an electric arc furnace for smelting, cutting the alloy ingots after repeated smelting into small pieces, and putting them into the quartz tube of a high-vacuum single-roll belt throwing machine;

[0023] 3) The quartz glass tube is clamped in the electric induction heating ring of the stripping machine, and the distance between the nozzle and the surface of the copper roller is adjusted to 150 μm;

[0024] 4) Close the furnace door, and use a mechan...

Embodiment 2

[0033] The sample size of the SiC-based composite material used in the present invention is 3mm×4mm×20mm, and the surface to be brazed is 3mm×4mm in section.

[0034] The composition and content of solder: Co41.2%, Ni 10.8%, Nb26.5%, V21.5%.

[0035] The preparation method of the solder is the same as that in Example 1, and the thickness of the prepared solder foil strip is 80 μm.

[0036] The technique of brazing by brazing filler metal of the present invention may further comprise the steps:

[0037] (1) Preparation stage: Clean the surface of the SiC-based composite material sample to be brazed to remove impurities, oil stains and oxide films on the surface, use W28~W7 metallographic sandpaper to grind and smooth, and use a polishing cloth to polish, Then put the SiC-based composite material and the amorphous solder foil together in acetone, use ultrasonic cleaning for 10 minutes, and perform drying treatment;

[0038] (2) Assembly stage: use 502 instant adhesive to assem...

Embodiment 3

[0042] The sample size of the SiC-based composite material used in the present invention is 3mm×4mm×20mm, and the surface to be brazed is 3mm×4mm in section.

[0043] The composition and content of solder: Co39%, Ni 12.1%, Nb27%, V21.9%.

[0044] The preparation method of the solder is the same as that in Example 1, and the thickness of the prepared solder foil strip is 80 μm.

[0045] The technique of brazing by brazing filler metal of the present invention may further comprise the steps:

[0046] (1) Preparation stage: Clean the surface of the SiC-based composite material sample to be brazed to remove impurities, oil stains and oxide films on the surface, use W28~W7 metallographic sandpaper to grind and smooth, and use a polishing cloth to polish, Then put the SiC-based composite material and the amorphous solder foil together in acetone, use ultrasonic cleaning for 10 minutes, and perform drying treatment;

[0047] (2) Assembly stage: use 502 instant adhesive to assemble th...

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Abstract

The invention discloses brazing filler metal for brazing a SiC-based composite material and a brazing process. The brazing filler metal comprises the following elements in percentages by mass: 39-43% of Co, 8.6-12.1% of Ni, 23.6-27% of Nb and 18.5-22% of V. The melting temperature of the brazing filler metal is moderate, and the brazing filler metal is melted uniformly; by the foil-piece-shaped amorphous brazing filler metal, element diffusion and interface reaction are facilitated in a brazing connection process, metallurgical solid solution reaction between the brazing filler metal and the SiC-based composite material is facilitated, residual stress in a brazing joint is relieved effectively, and mechanical properties of the joint are improved. According to the brazing process, base metal is in a vacuum state in a heating process by vacuum brazing connection, deformation and grain coarsening do not exist, and problems of oxidation, pollution and the like are avoided; and the vacuum brazing process is stable and reliable, wetting spreadability of the surface is good, filling of brazing seams is facilitated, overall performance of the joint is improved, and therefore, the brazing joint with excellent performance can be obtained.

Description

technical field [0001] The invention relates to a solder used for brazing of SiC-based composite materials and a brazing process. Background technique [0002] SiC has excellent high-temperature oxidation resistance and mechanical properties, while fiber-reinforced SiC and composite materials improve the fracture toughness of the material due to fiber implantation. SiC and composite materials have low density, low thermal expansion coefficient, high temperature strength and resistance A series of excellent properties such as good thermal shock performance. Therefore, fiber-reinforced SiC-based composites have broad application prospects in high-temperature aviation as new lightweight structural materials. Although the toughness of composites has improved compared to pure SiC, it is still difficult to prepare components with complex shapes using traditional ceramic forming and machining methods. Connection technology is a way to solve the problem from simple shape parts to ...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20B23K35/30
CPCB23K1/008B23K1/20B23K1/206B23K35/3046
Inventor 许祥平刘启明邹家生夏春智
Owner 江苏元沣机械设备有限公司
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