Ultrasonic brazing method for high-volume-fraction silicon carbide particle enhanced aluminum-base composite and low-expansion alloy

An aluminum-based composite material and low-expansion alloy technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of large residual stress of joints, high connection temperature, complicated process, etc., and achieve firm metallurgical bonding and connection temperature. The effect of low, low coefficient of linear expansion

Active Publication Date: 2012-09-12
HARBIN INST OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The present invention aims to solve the problems of complex process, high cost, high connection temperature and large joint residual stress in the connection of high volume fraction silicon carbide particle reinforced aluminum matrix composite material and low expansion alloy in the existing brazing method, and provides high volume fraction silicon carbide Ultrasonic Brazing Method of Particle Reinforced Aluminum Matrix Composites and Low Expansion Alloy

Method used

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  • Ultrasonic brazing method for high-volume-fraction silicon carbide particle enhanced aluminum-base composite and low-expansion alloy
  • Ultrasonic brazing method for high-volume-fraction silicon carbide particle enhanced aluminum-base composite and low-expansion alloy
  • Ultrasonic brazing method for high-volume-fraction silicon carbide particle enhanced aluminum-base composite and low-expansion alloy

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specific Embodiment approach 1

[0017] Specific embodiment one: the ultrasonic brazing method of high volume fraction silicon carbide particle reinforced aluminum matrix composite material and low expansion alloy in this embodiment is carried out according to the following steps: 1. Perform welding on the surface to be welded of aluminum matrix composite material and low expansion alloy Surface cleaning; 2. Put metal on the surface to be welded of the low expansion alloy obtained in step 1, heat until the metal melts, apply ultrasonic vibration for 0.5-60s, form a metal layer after cooling, and machine the metal layer to a thickness of 0.1- 0.5mm; 3. Lap the surface to be welded of the low-expansion alloy processed in step 2 and the aluminum-based composite material cleaned in step 1, place the aluminum-based composite material below, and adjust the distance between the low-expansion alloy and the aluminum-based composite material. The size of the gap is 50-500μm, and the solder is placed on the aluminum matr...

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the specific method for cleaning the surface of the aluminum-based composite material to be welded in step 1 is: use 150# and 500# water sandpaper to polish the aluminum layer by step. The surface to be welded of the matrix composite material was polished with a 2.5 μm diamond polishing agent, and then ultrasonically cleaned in acetone for 10 minutes. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, the specific method for cleaning the surface of the low-expansion alloy surface to be welded is: using 150#, 500#, 1000# and 1500# Polish the surface of the low-expansion alloy to be welded step by step with water sandpaper, and then ultrasonically clean it in acetone for 10 minutes. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to an ultrasonic brazing method for an aluminum-base composite and low-expansion alloy, in particular to an ultrasonic brazing method for a high-volume-fraction silicon carbide particle enhanced aluminum-base composite and low-expansion alloy. The ultrasonic brazing method solves the problems that existing brazing methods for connection of the high-volume-fraction silicon carbide particle enhanced aluminum-base composite and the low-expansion alloy are complex in process and high in cost, connection temperature and joint residual stress. The method includes: firstly, cleaning to-be-brazed surfaces of the aluminum-base composite and the low-expansion alloy; secondly, coating a metal layer on the to-be-brazed surface of the low-expansion alloy; thirdly, lapping the to-be-brazed surfaces of the aluminum-base composite and the low-expansion alloy, wherein brazing materials are arranged on the lateral side of a lapping joint to form a to-be-brazed part; and fourthly, heating the to-be-brazed part, ultrasonically vibrating, heating, preserving heat, pressurizing at the joint while ultrasonically vibrating, and performing furnace cooling to the room temperature, so that ultrasonic brazing is completed. The ultrasonic brazing method is simple in process, low in cost, low in connection temperature and high in joint residual stress. The ultrasonic brazing method is used for the brazing field.

Description

technical field [0001] The invention relates to an ultrasonic brazing method of an aluminum-based composite material and a low-expansion alloy. Background technique [0002] The aluminum matrix composite material reinforced with high volume fraction silicon carbide particles has the characteristics of high specific stiffness, specific strength, good thermal conductivity, low thermal expansion coefficient and low density, and has broad application prospects in electronic packaging. Aluminum matrix composites reinforced with high volume fraction silicon carbide particles are expected to replace Kovar alloys, which can not only reduce the weight of the packaging shell, but also improve its thermal conductivity. However, due to the packaging requirements of electronic packaging devices, high-volume-fraction aluminum matrix composites cannot completely replace Kovar alloys, and the process must be able to realize the connection of high-volume-fraction aluminum matrix composites a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/06B23K1/20
Inventor 闫久春魏晶慧阴祖强李大成于汉臣邓冰辉陈晓光王谦
Owner HARBIN INST OF TECH
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