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Method for brazing Ti2AlC ceramics by Al base brazing filler metal

A technology of brazing material and ceramics, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of short life of electrical contact components, reduce brazing temperature, improve joint strength, and good metallurgical bonding Effect

Inactive Publication Date: 2017-12-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problem that the life of the existing electrical contact components is short, and to provide a method of using Al-Si solder to braze Ti 2 AlC ceramic method

Method used

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  • Method for brazing Ti2AlC ceramics by Al base brazing filler metal
  • Method for brazing Ti2AlC ceramics by Al base brazing filler metal
  • Method for brazing Ti2AlC ceramics by Al base brazing filler metal

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specific Embodiment approach 1

[0030] Specific embodiment 1: This embodiment uses Al-based solder to braze Ti 2 The method of AlC ceramics is carried out in the following steps:

[0031] 1. Preparation of solder:

[0032] Mix the high-purity Al powder and Si powder into a crucible, then place it in a resistance furnace, heat up to 750℃~800℃, keep for 3h, fully melt and homogenize, then cool to room temperature along with the furnace to obtain brazing filler metal;

[0033] The mass fraction of Si in the brazing filler metal is 0%-12%, and the mass fraction of Al is 88%-100%;

[0034] 2. Put Ti 2 The surface of AlC ceramic base material to be welded is polished, and then polished with 600#, 1200#, 1500# water sandpaper, and 0.5μm diamond polishing agent is used to polish the surface until there are no obvious scratches. After polishing the Ti 2 The AlC ceramic base material is placed in absolute ethanol and ultrasonically oscillated for 10min~20min;

[0035] 3. Make the solder prepared in step 1 into solder foil, soak...

specific Embodiment approach 2

[0038] Specific embodiment two: this embodiment is different from specific embodiment one in that in step one, the temperature is raised to 780° C. and the temperature is kept for 3 hours. Others are the same as the first embodiment.

specific Embodiment approach 3

[0039] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is the Ti after polishing in step two 2 The AlC ceramic base material was placed in absolute ethanol and ultrasonically oscillated for 15 minutes. Others are the same as the first or second embodiment.

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Abstract

The invention relates to a method for brazing Ti2AlC ceramics by Al base brazing filler metal, and aims to solve the technical problem of short service life of an existing electric contact component. The method includes the steps: first, preparing the brazing filler metal; second, assembling a Ti2AlC ceramic / brazing filler metal / Ti2AlC ceramic structural part, placing the structural part into a vacuum brazing furnace, performing vacuum pumping to reach 6.0*10<3>Pa, increasing temperature to 300 DEG C at the heating rate of 10 DEG C / min, keeping the temperature for 30min, increasing the temperature to 660-900 DEG C at the heating rate of 10 DEG C / min, keeping the temperature for 5-30min under the pressure of 0.2-1.0MPa, reducing the temperature to 300 DEG C at the cooling rate of 10 DEG C / min, performing furnace cooling and finishing brazing the Ti2AlC ceramics by the Al base brazing filler metal. By the method, a joint with an excellent mechanical property can be obtained, the shear strength of the joint is 70-120MPa, and electrical conductivity is 3.73-4.18*10<6>S / m and reaches 94% or more of the electrical conductivity of the Ti2AlC ceramics.

Description

Technical field [0001] The invention relates to brazing Ti with Al-based solder 2 AlC ceramic method. Background technique [0002] In recent years, a new type of ternary layered carbide or nitride ceramic has both the characteristics of metal and ceramics, which has attracted the attention of many materials researchers. In the 1960s, Jeitschko and Nowotny first reported that this class has M n+1 AX n The chemical formula structure of the material and its related crystal structure. In 1996, the research work of Barsoum et al. gave people a more in-depth understanding of this type of material. After that, they successfully prepared Ti2AlC and other bulk materials of this type of ceramic, and systematically studied its structure and performance characteristics to make people realize the This type of material has the comprehensive properties of metal and ceramic, and this type of ceramic has excellent high temperature resistance, thermal shock resistance, good electrical and therma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/40B23K1/19B23K1/20B23K1/008
Inventor 张杰孙良博刘春凤
Owner HARBIN INST OF TECH
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