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Dissimilar material brazing method of porous intermediate layer structure brazing seam

A technology of dissimilar materials and brazing methods, applied in the field of material welding, can solve the problems of weakening the mechanical properties of joints, joint damage, large residual stress of joints, etc., and achieve the effect of simple and feasible operation, reducing residual stress and improving mechanical properties

Active Publication Date: 2015-04-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention solves the problem that the existing dissimilar materials are prone to produce large residual stress during the brazing process, which seriously weakens the mechanical properties of the joint, and even leads to the destruction of the already connected joint, and provides a porous intermediate layer structure brazing seam Dissimilar material brazing method

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  • Dissimilar material brazing method of porous intermediate layer structure brazing seam

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specific Embodiment approach 1

[0015] Specific implementation mode one: combine figure 1 Specifically illustrate the present embodiment, the dissimilar material brazing method of the porous intermediate layer structure brazing seam described in the present embodiment is specifically carried out according to the following steps:

[0016] 1. Polish the ceramic matrix composite material with sandpaper and wash it with acetone for 10 minutes to 20 minutes to obtain a ceramic matrix composite material with impurities removed from the surface; polish the metal material with sandpaper and wash it with acetone for 10 minutes to 20 minutes to obtain a metal material with impurities removed from the surface;

[0017] 2. Mix the nano-alumina template and the brazing material evenly to obtain the composite porous interlayer brazing filler metal, stack the ceramic matrix composite material with the impurity-removed surface and the metal material with the impurity-removed surface in sequence, and then place the composite ...

specific Embodiment approach 2

[0022] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the ceramic matrix composite material described in step 1 is SiC ceramics, SiO 2 -BN ceramic or SiO 2 ceramics. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the nano-alumina template described in step 2 has a pore diameter of 20 nm to 400 nm and a thickness of 20 μm to 60 μm. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a dissimilar material brazing method of a porous intermediate layer structure brazing seam, relates to the field of welding of materials, and aims to solve the problems that great residual stress can be easily generated by a connector in the existing brazing process of the dissimilar material, the mechanical property of the connector is greatly reduced, even the connected connector is damaged. The method comprises the following steps of grinding and removing impurities on a ceramic matrix composite material and a metal material, then uniformly mixing a nanometer aluminum oxide template with a brazing filler to obtain a composite porous intermediate layer brazing filler, sequentially stacking the ceramic matrix composite material and the metal material, subsequently putting the composite porous intermediate layer brazing filler between the to-be-welded surfaces of the ceramic matrix composite material and the metal material to obtain a to-be-welded part; putting the to-be-welded part in a vacuum brazing furnace, vacuumizing, preserving heat at the high temperature, and finally cooling to the room temperature, thus completing the dissimilar material brazing process of the porous intermediate layer structure brazing seam. The method is suitable for brazing the dissimilar material of the porous intermediate layer structure brazing seam.

Description

technical field [0001] The invention relates to the field of material welding. Background technique [0002] In order to meet some special needs or give full play to the performance of materials, it is necessary to combine dissimilar materials, and then it is necessary to realize the connection of dissimilar materials. Judging from the current welding methods, brazing is one of the most potential technologies to realize the connection of ceramic materials and dissimilar materials, and the brazing method has been widely studied. Compared with other welding methods, it has the advantages of simple process, low cost, and suitable for connection between dissimilar materials. However, brazing of dissimilar materials mainly faces the following two major problems. One: The difficulty of connection is mainly manifested in the difference in physical properties and chemical properties of dissimilar materials. During the brazing process, the joints are prone to large thermal stress....

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/19B23K1/20C04B37/02
CPCB23K1/008B23K1/19B23K1/20B23K1/206C04B37/02
Inventor 亓钧雷林景煌周玉杨郭佳乐张兴凯冯吉才
Owner HARBIN INST OF TECH
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