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A method for brazing ceramics or ceramic-based composite materials and metals with a composite intermediate layer

A composite intermediate layer and composite material technology, which is applied in the field of composite intermediate layer brazing ceramics or ceramic-based composite materials and metals, can solve the problems of low reliability and high residual stress of brazed joints, and achieve stable product performance and improved joint strength , Improve the effect of joint strength

Active Publication Date: 2018-10-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a composite intermediate layer brazing ceramic or ceramic matrix composite material and metal in order to solve the problem of high residual stress and low reliability of the brazed joint between the existing ceramic or ceramic matrix composite material and metal. Methods

Method used

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  • A method for brazing ceramics or ceramic-based composite materials and metals with a composite intermediate layer

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Experimental program
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Effect test

specific Embodiment approach 1

[0016] Specific implementation mode 1: In this implementation mode, the method for brazing ceramics or ceramic-based composite materials and metals with a composite intermediate layer is realized according to the following steps:

[0017] 1. Polish the ceramics or ceramic matrix composite materials to be welded, metal materials to be welded, porous ceramics, Ti foil and AgCuTi foil with sandpaper, and then wash with acetone for 10-20 minutes to obtain a clean ceramic or ceramic matrix composite to be welded. Materials, metal materials to be welded, porous ceramics, Ti foil and AgCuTi foil solder;

[0018] 2. Put the clean porous ceramics into the mold, then coat the porous ceramics with AgCuTi powder solder to form the intermediate layer, and then place the intermediate layer in a vacuum brazing furnace at a heating rate of 2°C / min~50°C / Min heat up to 840°C-920°C, keep warm for 1min-30min, cool to room temperature and cut into foils to obtain ceramic-metal dual-phase continuo...

specific Embodiment approach 2

[0025] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that step 1 uses 80#~1000# SiC sandpaper to polish the ceramics or ceramic matrix composite materials to be welded, metal materials to be welded, porous ceramics, Ti foil and AgCuTi foil Solder. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0026] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the ceramic or ceramic matrix composite material to be welded described in step one is ZrB 2 -SiC-C ceramic matrix composites, ZrB 2 -SiC ceramic matrix composites, C / SiC ceramic matrix composites, C / C composites, SiC ceramics, ZrB 2 Ceramic, ZrO 2 Ceramic, Al 2 o 3 ceramic or graphite. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a braze-welding method for a ceramic or ceramic-based composite material and metal through a composite interlayer. The braze-welding method for the ceramic or ceramic-based composite material and metal solves the problems that an existing braze-welding joint for the ceramic or ceramic-based composite material and metal is relatively high in residual stress and is relatively low in reliability. The braze-welding method comprises the following steps of: I, grinding braze-welding materials such as to-be-welded ceramic and a to-be-welded metal material; II, coating porous ceramic with AgCuTi powder brazing filler metal to form an interlayer, and heating and melting the interlayer, and cooling the heated and molten interlayer to obtain a ceramic-dual-phase continuous interlayer; III, superposing the to-be-welded material, AgCuTi foil-shaped brazing filler metal, the double-phase continuous interlayer, a Ti foil, AgCuTi foil-shaped brazing filler metal and to-be-welded ceramic from bottom to top in sequence; and IV, carrying out vacuum braze-welding on a to-be-welded part. According to the braze-welding method, a pressureless infiltration method is adopted to fill porous ceramic with liquid-state AgCuTi brazing filler metal, and AgCuTi foil, the double-phase interlayer, the Ti foil and the AgCuTi foil are superposed for being subjected to braze-welding, so that joint strength is improved.

Description

technical field [0001] The invention relates to a brazing method for ceramics or ceramic-based composite materials and metals, in particular to a method for brazing ceramics or ceramic-based composite materials and metals with a composite intermediate layer with low residual stress and reliable and stable performance. Background technique [0002] New ceramics or ceramic matrix composites have high melting point, high hardness, good fracture toughness, high temperature oxidation resistance and thermal shock resistance, and have broad application prospects in the aerospace field. However, in practical applications, in order to solve the problem that the processing of components is difficult due to the high hardness of ceramic materials, it is necessary to prepare ceramic-metal composite components. [0003] Currently, the most common method of joining ceramics or ceramic matrix composites and metals is brazing. The problems that need to be solved in the connection between ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/19B23K35/30
CPCB23K1/008B23K1/19B23K35/3006
Inventor 张丽霞雷敏刘世艳张博冯吉才
Owner HARBIN INST OF TECH
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