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A kind of brazing ti using al-based solder 2 alc ceramic method

A technology of brazing material and ceramics, applied in the direction of welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of short life of electrical contact components, achieve the effects of reducing brazing temperature, improving joint strength, and low melting point

Inactive Publication Date: 2019-10-22
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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  • A kind of brazing ti using al-based solder <sub>2</sub> alc ceramic method
  • A kind of brazing ti using al-based solder <sub>2</sub> alc ceramic method
  • A kind of brazing ti using al-based solder <sub>2</sub> alc ceramic method

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0030] Specific implementation mode 1: In this implementation mode, a kind of Al-based solder is used to braze Ti 2 The method for AlC ceramics proceeds as follows:

[0031] 1. Preparation of solder:

[0032] Mix high-purity Al powder and Si powder into a crucible, then place it in a resistance furnace, raise the temperature to 750°C to 800°C, keep it warm for 3 hours, fully melt and homogenize, then cool to room temperature with the furnace to obtain brazing filler metal;

[0033] The mass fraction of Si in the solder is 0% to 12%, and the mass fraction of Al is 88% to 100%;

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

[0...

specific Embodiment approach 2

[0038] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the temperature is raised to 780° C. and kept for 3 hours. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0039] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the polished Ti in step two 2 The AlC ceramic base material was placed in absolute ethanol and ultrasonically oscillated for 15 min. Others are the same as those in 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 a method for brazing Ti with Al-based solder 2 method for AlC ceramics. Background technique [0002] In recent years, a new type of ternary layered carbide or nitride ceramic has the characteristics of both metal and ceramic, so it has attracted the attention of many material researchers. In the 1960s, Jeitschko and Nowotny first reported that this class has M n+1 AX n Chemically structured materials and their associated crystal structures. In 1996, the research work of Barsoum et al. gave people a deeper understanding of this type of material, and then they successfully prepared bulk materials such as Ti2AlC and other ceramics, and systematically studied its structure and performance characteristics, making people realize that this type of material is This type of material has the comprehensive properties of both metal and ceramics, and this type of ceramics has excellent high temperature resistance, thermal shock resista...

Claims

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Application Information

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Patent Type & Authority Patents(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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