Alumina ceramic low temperature brazing connection method

A technology of alumina ceramics and a connection method, which is applied in the field of low-temperature brazing and connection of alumina ceramics, can solve the problems of high welding temperature and low connection strength of joints, and achieves the effects of simple process, good industrial application prospect, and guaranteed reliability.

Active Publication Date: 2016-03-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing brazed alumina ceramics has a relatively high welding

Method used

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  • Alumina ceramic low temperature brazing connection method

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specific Embodiment approach 1

[0017] Specific implementation mode 1: In this implementation mode, the low-temperature brazing connection method of alumina ceramics is carried out according to the following steps:

[0018] 1. According to the mass percentage, 60% to 85% of Bi 2 o 3 , 10% to 30% of B 2 o 3 , 2% to 10% of ZnO and 0.1% to 1.0% of SiO 2 Mix to obtain low melting point bismuth salt glass powder;

[0019] 2. Use a cutting machine to cut the alumina ceramics to be welded into shape, first use a diamond sand disc to mechanically polish the alumina ceramics to be welded, then place them in acetone for ultrasonic cleaning for 5 to 15 minutes, and finally use absolute ethanol to ultrasonically clean and dry After obtaining pretreated alumina ceramics;

[0020] 3. Evenly spread a layer of boron trioxide powder on the connection surface of the pretreated alumina ceramic obtained in step 2, then place it in a muffle furnace, and heat it to 800-950°C at a heating rate of 5-20°C / min. ℃, keep warm for...

specific Embodiment approach 2

[0024] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, 75% to 80% of Bi 2 o 3 , 10% to 15% of B 2 o 3 , 6%~9% ZnO, 0.1%~1.0% SiO 2 mix. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0025] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that step 2 sequentially uses 500#, 1000#, 1500# and 2000# diamond discs to mechanically grind the alumina ceramics to be welded. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to an alumina ceramic low temperature brazing connection method and aims at solving the problems that existing brazing alumina ceramics are high in soldering temperature and low in connection strength of obtained joints. The brazing connection method comprises the following steps: 1, mixing Bi2O3, B2O3, ZnO and SiO2, and obtaining low-melting-point bismuthate glass powder; 2, conducting mechanical grinding on an alumina ceramic, conducting ultrasonic cleaning, and obtaining a pre-treated alumina ceramic; 3, preparing an alumina ceramic where aluminum borate whiskers grow; 4, applying glass soldering paste to the surface of the alumina ceramic where the aluminum borate whiskers grow; 5, making two alumina ceramic parts to be soldered be in contact and aligned with each other; 6, conducting brazing connection at the temperature of 480-650 DEG C. By means of the alumina ceramic low temperature brazing connection method, connection of the alumina ceramic is achieved at the low temperature, the thermal expansion coefficient of the adopted glass brazing material is matched with the alumina ceramic, the shearing strength of an obtained soldered joint can reach 60-100 MPa, and reliability of alumina connection is guaranteed.

Description

technical field [0001] The invention relates to a low-temperature brazing connection method for alumina ceramics. Background technique [0002] Due to its high melting point, excellent chemical stability, high hardness and high strength and other excellent properties, alumina ceramics are widely used in industries such as machinery, electronics, chemical industry, medicine, aerospace and jewelry processing. At present, the methods of connecting alumina ceramics mainly include diffusion welding and brazing, among which brazing is the most studied and widely used connection method. [0003] The traditional method of brazing alumina ceramics is to use active solder such as AgCuTi and CuTi to realize the connection of alumina. However, the connection temperature using active solder is high, and brazing is generally higher than 800 ° C, and the deformation of alumina is relatively large, resulting in large residual internal stress in the brazed joint, reducing the connection str...

Claims

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Application Information

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IPC IPC(8): C04B37/00
CPCC04B37/001C04B2237/10
Inventor 林铁松何鹏郭伟
Owner HARBIN INST OF TECH
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