A low-expansion 4j42 alloy interlayer auxiliary brazing material to improve the quality of silicon carbide-niobium brazing connection

A connection quality and intermediate layer technology, applied in welding equipment, auxiliary devices, metal processing equipment, etc., can solve the problems of large residual stress in the brazing connection of silicon carbide and niobium, poor reaction of the ceramic side interface, etc., and achieve optimal weld structure Reaction with the interface, improvement of plasticity and toughness, and the effect of preventing cracks

Active Publication Date: 2022-08-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The present invention solves the problems of excessive residual stress in the existing silicon carbide and niobium brazing connection and poor reaction of the ceramic side interface, and provides a method for improving the quality of the silicon carbide-niobium brazing connection by assisting the solder in the middle layer of the low-expansion 4J42 alloy

Method used

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  • A low-expansion 4j42 alloy interlayer auxiliary brazing material to improve the quality of silicon carbide-niobium brazing connection
  • A low-expansion 4j42 alloy interlayer auxiliary brazing material to improve the quality of silicon carbide-niobium brazing connection

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specific Embodiment approach 1

[0019] Embodiment 1: In this embodiment, a low-expansion 4J42 alloy intermediate layer auxiliary brazing material improves the quality of silicon carbide-niobium brazing connection, which is carried out according to the following steps:

[0020] 1. Pre-processing:

[0021] The titanium-zirconium-copper-nickel brazing filler metal is added to the binder to obtain the brazing filler metal containing the binder, and the brazing filler metal containing the binder is coated on the niobium metal surface to be welded to obtain the first brazing filler metal layer, and the first brazing filler metal layer is obtained. A 4J42 alloy foil with a thickness of 100 μm to 200 μm is placed on the solder layer, and then a layer of solder containing an adhesive is coated on the 4J42 alloy foil to obtain a second solder layer, which is placed on the second solder layer. Silicon carbide, and finally heated and dried to obtain the parts to be welded;

[0022] 2. Vacuum brazing:

[0023] Place th...

specific Embodiment approach 2

[0028]Embodiment 2: The difference between this embodiment and Embodiment 1 is that the binder described in Step 1 is a carboxymethyl cellulose binder or an ethyl cellulose binder. Others are the same as the first embodiment.

specific Embodiment approach 3

[0029] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the mass percentage of Ti in the titanium-zirconium-copper-nickel solder described in step 1 is 41.14%, and the mass percentage of Zr is 34.36%, The mass percentage of Cu is 14.67%, and the mass percentage of Ni is 9.83%. Others are the same as in the first or second embodiment.

[0030] The titanium zirconium copper nickel brazing filler metal is Ti41.14-Zr34.36-Cu14.67-Ni9.83.

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Abstract

A low-expansion 4J42 alloy intermediate layer auxiliary brazing material improves the quality of silicon carbide-niobium brazing connection, and the invention relates to a method for silicon carbide-niobium brazing connection. The invention solves the problems of excessive residual stress in the brazing connection between silicon carbide and niobium and poor reaction of the ceramic side interface. Methods: 1. Pretreatment; 2. Vacuum brazing. The invention is used for the low-expansion 4J42 alloy intermediate layer auxiliary brazing material to improve the quality of silicon carbide-niobium brazing connection.

Description

technical field [0001] The invention relates to a silicon carbide-niobium brazing connection method. Background technique [0002] Silicon carbide ceramics have great application potential in the field of high temperature structures due to their high strength, corrosion resistance, creep resistance and excellent high temperature properties. It has become a structural material with broad application prospects in the fields of aerospace, petrochemical equipment and nuclear power engineering. [0003] However, silicon carbide also has the disadvantages of high brittleness and poor processing performance. It is difficult to make parts with complex shapes or large sizes, which limits its application in the engineering field. In the process of promoting the application of silicon carbide materials, it is inevitable to involve the application of silicon carbide and metal composites. At present, the connection between silicon carbide and various metal materials has been realized. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/20B23K3/08
CPCB23K1/008B23K1/20B23K1/203B23K3/082
Inventor 亓钧雷李培鑫霸金曹健冯吉才
Owner HARBIN INST OF TECH
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