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Si3N4 and 42CrMo steel connecting solder and brazing connection method

A connection method and brazing material 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 in welded joints, low joint strength, etc., and reduce thermal expansion coefficient errors. Matching, the effect of strength improvement

Inactive Publication Date: 2012-10-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve the problem of adopting existing Si 3 N 4 The welded joint obtained by connecting the solder and the brazing connection method with 42CrMo steel produces high residual stress, which leads to the problem of low joint strength, and proposes Si 3 N 4 Connecting solder and brazing connection method with 42CrMo steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0019] Specific embodiment one: Si in this embodiment 3 N 4 The solder for connection with 42CrMo steel is composed of mixed powder and composite phase, wherein the mixed powder is composed of 66%~71% Ag powder, 26%~31% Cu powder and 3%~6% Ti powder according to mass percentage; The composite phase is TiN particles, and the volume ratio of the composite phase to the mixed powder is (1~15):(85~99).

[0020] A certain volume proportion of TiN particles with a low thermal expansion coefficient is compounded in the solder, which can effectively reduce the thermal expansion coefficient mismatch between the base metal and the solder alloy.

specific Embodiment approach 2

[0021] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the mixed powder consists of 66.5%~70% Ag powder, 25%~30% Cu powder and 3.5%~5.5% Ti by mass percentage Powder composition; the composite phase is TiN particles, and the volume ratio of the composite phase to the mixed powder is (2~14):(86~98). Other components and parameters are the same as in Embodiment 1.

specific Embodiment approach 3

[0022] Specific embodiment three: the difference between this embodiment and specific embodiment one is: the mixed powder is composed of 69% Ag powder, 27% Cu powder and 4% Ti powder by mass percentage; the composite phase is TiN particles, The volume ratio of composite phase to mixed powder is 5:95. Other components and parameters are the same as in Embodiment 1.

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PUM

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Abstract

The invention discloses an Si3N4 and 42CrMo steel connecting solder and an Si3N4 and 42CrMo steel brazing connection method, relates to a ceramic and metal connecting solder and a ceramic and metal brazing connection method, and aims to solve the problem of weak joint strength caused by high residual stress generated by a welded joint obtained by the conventional Si3N4 and 42CrMo steel connecting solder and the conventional Si3N4 and 42CrMo steel brazing connection method. The Si3N4 and 42CrMo steel connecting solder consists of mixed powder and a composite phase. The Si3N4 and 42CrMo steel brazing connection method is implemented by the following steps of: 1, weighing and mixing metal powder to obtain the mixed powder; 2, adding the composite phase into the mixed powder, and performing ball grinding to obtain the composite connecting solder; 3, polishing and cleaning Si3N4 and 42CrMo steel; 4, preparing a pasty composite connecting solder, and forming a part to be welded by using the pasty composite connecting solder and the Si3N4 and 42CrMo steel; and 5, performing brazing connection. The connecting solder and the brazing connection method are used in the field of ceramic and metal brazing connection engineering.

Description

technical field [0001] The invention relates to a brazing material for connecting ceramics and metals and a brazing connection method. Background technique [0002] As a new type of structural material, advanced structural ceramic materials are widely used in national defense, energy, aerospace, machinery, petrochemical, metallurgy, etc. , electronics and other industries are increasingly showing its broad application prospects, causing extensive attention from industrially developed countries, and countries are competing to invest a lot of manpower and material resources in research. [0003] In structural ceramics, silicon nitride ceramics (Si 3 N 4 ) is an important part of today's engineering structure new materials. Si 3 N 4 Ceramics are typical covalently bonded ceramics, and the bonding between Si and N is quite strong, which leads to Si 3 N 4 Ceramics have a series of excellent physical, chemical and mechanical properties, such as oxidation resistance, high te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K1/008B23K103/18
Inventor 张杰王天鹏贺艳明刘春凤
Owner HARBIN INST OF TECH