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Method for ultrasonic-assisted porous ceramic brazing

A porous ceramic and ultrasonic-assisted technology, applied in the field of porous ceramic brazing, can solve the problems of poor joint performance and low welding efficiency, and achieve the effects of flexible application position, high welding efficiency and flexible composition ratio

Active Publication Date: 2019-05-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention solves the problems that the existing ceramic / ceramic welding requires a vacuum environment or a certain metallization treatment on the ceramic surface, and requires a certain heat preservation time, the welding efficiency is low and the joint performance is not high, and an ultrasonic assisted Porous ceramic brazing method

Method used

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  • Method for ultrasonic-assisted porous ceramic brazing
  • Method for ultrasonic-assisted porous ceramic brazing
  • Method for ultrasonic-assisted porous ceramic brazing

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specific Embodiment approach 1

[0040] Embodiment 1: In this embodiment, a method for ultrasonically assisted porous ceramic brazing is carried out according to the following steps:

[0041] 1. Pretreatment of weldments:

[0042] Clean the surfaces of 2 to 20 porous ceramics by grinding, polishing and ultrasonic cleaning to obtain pretreated porous ceramics;

[0043] The porosity of the porous ceramics is 10% to 90%;

[0044] Second, the wetting of ceramics:

[0045] Put the brazing filler metal in a brazing filler metal tank and heat it until it melts, and then, under ultrasonic vibration and the melting temperature of the brazing filler metal, immerse the pretreated porous ceramics in the molten brazing filler metal for wetting to obtain ultrasonic-assisted wetting ceramics;

[0046] When the ultrasonic vibration is continuously applied, under the condition that the ultrasonic amplitude is 0.1 μm to 100 μm, the ultrasonic frequency is 15 kHz to 50 kHz, and the ultrasonic power is 100W to 2000W, the ultra...

specific Embodiment approach 2

[0059] Specific embodiment two: the difference between this embodiment and specific embodiment two is: the porous ceramic described in step one is Si 3 N 4 Ceramic, Si 2 N 2 O ceramics, SiC ceramics, SiBCN ceramics, ZrO 2 Ceramic, Al 2 o 3 Ceramic, TiB 2 Ceramic, B 4 Cceramics, ZrB 2 Ceramic, TaB 2 One or more of ceramics, ZrC ceramics, binary ceramics, ternary ceramics and quaternary ceramics. Others are the same as in the second embodiment.

specific Embodiment approach 3

[0060] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that when the temperature of the porous ceramic weldment described in step 3 is below 190°C, the brazing filler metal described in step 2 is Sn-based brazing filler metal ; when the service temperature of the porous ceramic weldment described in step 3 is below 380°C, the solder described in step 2 is Zn-based solder; when the service temperature of the porous ceramic weldment described in step 3 is below 600°C, Then the brazing filler metal described in step 2 is Al-based brazing filler metal. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for porous ceramic brazing, in particular to a method for ultrasonic-assisted porous ceramic brazing. The problems that as for existing ceramic / ceramic welding, a vacuum environment is needed, or the ceramic surface needs to be subjected to certain metallization treatment, the certain heat preservation time is needed, thus the welding efficiency is low, and jointperformance is low are solved. The preparation method comprises the steps: 1 to-be-welded part pretreatment, 2 ceramic wetting, and 3 ceramic welding, or the preparation method comprises the steps: 1porous ceramic pretreatment, and 2 ceramic welding. The method is used for ultrasonic-assisted porous ceramic brazing.

Description

technical field [0001] The present invention relates to a method of brazing porous ceramics. Background technique [0002] Ceramics are widely used in aerospace, nuclear industry and other fields because of their good mechanical properties and chemical stability at high temperatures. Porous ceramics are favored for their strength, hardness, corrosion resistance and low density. Porous ceramics have poor ductility, poor processability, and are difficult to machine, which makes the manufacture of ceramic composites and large-scale components very difficult. However, many parts in the manufacturing industry now involve connections between porous ceramics and porous ceramics / metals. Therefore, inventing a method suitable for connecting porous ceramics will greatly promote the widespread use of porous ceramics. At present, the commonly used welding methods of porous ceramics and ceramics mainly include diffusion welding and brazing. [0003] The majority of scholars have used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/06
Inventor 李政玮许志武闫久春
Owner HARBIN INST OF TECH
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