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A method for selective hot corrosion assisted brazing of fiber-reinforced composites and metals

A composite material, fiber reinforced technology, used in metal processing equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of poor connection interface structure, large residual stress, and small ceramic application range, and improve the connection. Interfacial area, reducing residual stress, changing the effect of fracture path

Active Publication Date: 2022-03-25
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem of excessive residual stress and poor connection interface structure due to property differences in the existing fiber-reinforced ceramic matrix composite material and metal brazing connection, and the existing fiber-reinforced ceramics are surface treated to form fiber-reinforced The method of the transition layer has the problem of small application range of ceramics and the need for high pressure or high temperature, and provides a method for selective thermal corrosion assisted brazing of fiber reinforced composite materials and metals

Method used

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  • A method for selective hot corrosion assisted brazing of fiber-reinforced composites and metals
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  • A method for selective hot corrosion assisted brazing of fiber-reinforced composites and metals

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specific Embodiment approach 1

[0028] Specific Embodiment 1: In this embodiment, a method for selective thermal corrosion assisted brazing of fiber-reinforced composite materials and metals is carried out according to the following steps:

[0029] 1. Preparation of hot corrosion molten salt:

[0030] Mix the alkaline oxidant, corrosion inhibitor and carbon powder to obtain a mixed powder, and then grind the mixed powder evenly to obtain a hot corrosion molten salt;

[0031] The mass percentage of the corrosion inhibitor in the hot corrosion molten salt is 5% to 30%; the mass percentage of the carbon powder in the hot corrosion molten salt is 1% to 5%;

[0032] 2. Preparation of thermal corrosion protection layer:

[0033] Cut the fiber-reinforced composite material and grind and polish each surface, use PVD process to plate Ni-Cr layer on the non-welding surface of the fiber-reinforced composite material, and then keep it warm for 10min under the condition of annealing temperature of 300℃~500℃ ~60min, aft...

specific Embodiment approach 2

[0043] Embodiment 2: This embodiment differs from Embodiment 1 in that the diameter of the carbon powder described in step 1 is 1 μm˜10 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0044] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the purity of the alkaline oxidizing agent described in step 1 is 99.9%. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for selective thermal corrosion auxiliary brazing of fiber reinforced composite material and metal, which relates to a brazing method of fiber reinforced composite material and metal. The invention solves the problem of excessive residual stress and poor connection interface structure due to property differences in the existing fiber-reinforced ceramic matrix composite material and metal brazing connection, and the existing fiber-reinforced ceramics are surface treated to form a fiber-reinforced transition The method of layering has the problem that the application range of ceramics is small, and high pressure or high temperature is required. Preparation method: 1. preparation of hot corrosion molten salt; 2. preparation of hot corrosion protective layer; 3. hot corrosion treatment; 4. brazing process. The invention is used for selective hot corrosion auxiliary brazing method of fiber-reinforced composite material and metal.

Description

technical field [0001] The invention relates to a brazing method of fiber reinforced composite material and metal. Background technique [0002] Fiber-reinforced ceramic matrix composites have the characteristics of high specific strength, good dimensional stability, ablation resistance and thermal shock resistance of ceramic materials, and good fracture toughness and impact resistance. It replaces ceramic materials in lightweight design and It has been widely used in structures such as heat-resistant ablation. Due to the high cost of composite materials and the difficulty in preparing large-scale structural parts, they often need to be connected with metals to meet actual production needs. For joining dissimilar materials, high-quality joints can be achieved cost-effectively with active brazing technology. However, the brazing of ceramic matrix composites and metals is plagued by two problems: one is that the properties of composites and metals are very different, resulti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/20B23K1/19
CPCB23K1/20B23K1/19B23K2103/16B23K2103/52
Inventor 亓钧雷霸金纪旭王斌李培鑫曹健冯吉才
Owner HARBIN INST OF TECH
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