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Composite brazing material for connecting Si3N4 ceramic and 42CrMo steel and brazing method by using same

A composite solder and ceramic technology, which is applied in the direction of welding/welding/cutting articles, welding/cutting media/materials, welding media, etc., can solve the problems of high residual stress and low joint strength, achieve broad prospects, improve strength, The effect of good wettability

Inactive Publication Date: 2012-09-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the invention is to solve the existing composite solder brazing connection Si 3 N 4 The high residual stress and low joint strength of the welded joints obtained by ceramics and 42CrMo steel, while providing the connection Si 3 N 4 Composite solder of ceramics and 42CrMo steel and method for brazing with it

Method used

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  • Composite brazing material for connecting Si3N4 ceramic and 42CrMo steel and brazing method by using same
  • Composite brazing material for connecting Si3N4 ceramic and 42CrMo steel and brazing method by using same
  • Composite brazing material for connecting Si3N4 ceramic and 42CrMo steel and brazing method by using same

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specific Embodiment approach 1

[0040] Specific implementation mode 1: This implementation mode is used to connect Si 3 N 4 The composite solder of ceramics and 42CrMo steel is composed of mixed powder and reinforcing phase; the mixed powder is composed of 60%-75% Ag powder, 20%-35% Cu powder and 3%-6% Ti powder ; The reinforcing phase is Mo powder or WC powder accounting for 5% to 40% of the volume of the mixed powder.

specific Embodiment approach 2

[0041] Specific embodiment two: the difference between this embodiment and specific embodiment one is that it is used to connect Si 3 N 4 The composite solder of ceramics and 42CrMo steel is composed of mixed powder and reinforcing phase; the mixed powder is composed of 65%-73% Ag powder, 22%-30% Cu powder and 4%-5.5% Ti powder. ; The reinforcing phase is Mo powder or WC powder accounting for 10% to 30% of the volume of the mixed powder.

specific Embodiment approach 3

[0042] Specific embodiment three: this embodiment adopts the method for connecting Si described in specific embodiment one 3 N 4 The method that the composite solder of ceramics and 42CrMo steel carries out brazing is to realize through the following steps:

[0043] 1. Mix 60% to 75% of Ag powder, 20% to 35% of Cu powder and 3% to 6% of Ti powder according to mass percentage to obtain mixed powder;

[0044] 2. Add a reinforcing phase accounting for 5% to 40% of the volume of the mixed powder to the mixed powder to obtain powder A, and then put the powder A into a ball mill tank and perform ball milling at a speed of 200 to 300r / min for 1 to 10 hours to obtain Composite solder;

[0045] 3. Mix the composite solder and hydroxyethyl cellulose into a paste, and dry it at a temperature of 20-100°C to form a composite solder sheet with a thickness of 80-260 μm;

[0046] Four, the Si 3 N 4 The surface to be welded of ceramics and 42CrMo steel was ultrasonically cleaned with acet...

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Abstract

The invention relates to a brazing material for connecting ceramic and steel and a brazing method, particularly a composite brazing material for connecting Si3N4 ceramic and 42CrMo steel and a brazing method by using the same... The invention aims to solve the problems of high residual stress and low strength of the brazing joint formed by connecting the Si3N4 ceramic and 42CrMo steel by the existing brazing material. The brazing material is prepared from Ag powder, Cu powder, Ti powder and a reinforcing phase. The method comprises the following steps: mixing Ag powder, Cu powder, Ti powder and an reinforcing phase, carrying out ball milling, mixing with hydroxyethyl cellulose, and drying to obtain a composite brazing material sheet; putting the composite brazing material sheet between the to-be-brazed surface of the Si3N4 ceramic and the to-be-brazed surface of the 42CrMo steel to obtain a to-be-brazed piece; and putting the to-be-brazed piece in a vacuum brazing furnace to carry out vacuum brazing, thereby completing the brazing of the composite brazing material for connecting the Si3N4 ceramic and the 42CrMo steel. The invention has the advantages of low residual stress and high strength of the brazing joint, and is applicable to brazing connection of ceramic and steel.

Description

technical field [0001] The present invention relates to a composite brazing material for connecting ceramics and metal brazing and a brazing method using it. Background technique [0002] As a new type of structural material, advanced structural ceramics are widely used in national defense, energy, aerospace, machinery, petrochemical, metallurgy, Electronics and other industries are increasingly showing broad application prospects, which have attracted the attention of industrialized countries, and have invested a lot of manpower and material resources in research. [0003] Silicon nitride ceramics (Si 3 N 4 ) is an important part of today's engineering structure new materials. Si and N in this type of ceramics are typically covalently bonded, resulting in Si 3 N 4 Ceramics have a series of excellent physical, chemical and mechanical properties, such as low thermal expansion coefficient, oxidation resistance, high temperature resistance, corrosion resistance, high intri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K1/19B23K1/008B23K103/18
Inventor 张杰贺艳明王兴
Owner HARBIN INST OF TECH
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