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ZrC-SiC ceramic and TC4 titanium alloy brazing method

A brazing method and titanium alloy technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of excessive dissolution of metal base metal, easy formation of brittle compounds, large residual stress of joints, etc., and achieve optimal brazing seam structure , reliable connection and high joint strength

Active Publication Date: 2021-03-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems that the existing ZrC-SiC ceramics and TC4 titanium alloy are brazed, the solder has poor wettability to the base metal, brittle compounds are easily generated in the brazing seam, the metal base material is excessively dissolved, and the residual stress of the joint is large. A kind of ZrC-SiC ceramics and TC4 titanium alloy brazing method

Method used

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  • ZrC-SiC ceramic and TC4 titanium alloy brazing method

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specific Embodiment approach 1

[0017] Specific embodiment one: present embodiment ZrC-SiC ceramics and TC4 titanium alloy brazing method are carried out according to the following steps:

[0018] Step 1. Add ZrH to pure Cu powder 2 The powder is used as a dispersant, and it is evenly spread on the silicon wafer after being fully mixed;

[0019] Step 2, using the PECVD method to grow graphene (VFG) on the surface of the copper powder on the silicon wafer in step 1, to obtain VFG-Cu;

[0020] Step 3: Weigh 80% to 92% of VFG-Cu and the remainder of ZrH by mass fraction 2 and mix evenly to obtain a mixed powder; Step 3 reweighs the ZrH 2 ;

[0021] Step 4, compressing the mixed powder obtained in step 3 to obtain brazing material foil;

[0022] Step 5, pre-cleaning ZrC-SiC ceramics to be brazed and TC4 titanium alloys to obtain pre-cleaned ZrC-SiC ceramics and TC4 titanium alloys;

[0023] Step 6. Place the solder foil obtained in step 4 between the pre-pre-cleaned ZrC-SiC ceramics and TC4 titanium alloy o...

specific Embodiment approach 2

[0025] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the thickness of the tiling in Step 1 is 44-75 μm. (Single-layer Cu powder at 44-75μm).

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the mass fraction of the dispersant in the Cu powder in Step 1 is 0.5%-3%. ZrH 2 Used as a dispersant, no graphene will grow during deposition, ZrH 2 It can prevent the Cu powder after growing graphene from sticking together.

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Abstract

The invention discloses a ZrCSiC ceramic and TC4 titanium alloy brazing method, and relates to a ZrCSiC ceramic and TC4 titanium alloy brazing method. The problems that when existing ZrCSiC ceramic and TC4 titanium alloy are brazed, wettability of brazing filler metal to a base metal is poor, brittle compounds are prone to being generated in brazing seams, a metal base metal is excessively dissolved, and connector residual stress is large are solved. The method comprises the steps: adding ZrH2 powder into Cu powder, wherein graphene grows on the surface of the Cu powder, and adding ZrH2 for tabletting to obtain a brazing filler metal foil; and performing brazing after assembling. According to the method, the vertical few-layer graphene grows on the surface of the Cu powder in situ, so thatthe reinforced composite brazing filler metal containing the graphene is prepared, the proportion of brittle compounds in brazing seams is reduced, the joint residual stress is relieved, and the wettability of the brazing filler metal to base metal is improved. Generation of the brittle compounds is avoided, and the problem of excessive dissolution of the base metal is solved. The method is suitable for brazing the ZrCSiC ceramic and the TC4 titanium alloy.

Description

technical field [0001] The invention relates to a brazing method of ZrC-SiC ceramics and TC4 titanium alloy. Background technique [0002] ZrC-SiC composite ceramics (ZS ceramics) are prepared by adding SiC to ZrC ceramics with ultra-high melting point (3420°C) and hardness (25.5GPa), which improves the sinterability of ZrC and improves oxidation resistance and fracture toughness And other properties, can be widely used in extreme thermal and chemical environments, such as high thrust-to-weight ratio engines and aerospace thermal protection systems. Ti-6Al-4V (TC4) is an α+β two-phase titanium alloy, which is currently the most widely used and successful titanium alloy. It has the characteristics of low density, high specific strength, and excellent corrosion resistance and fatigue resistance. The brazing of ZrC-SiC ceramics and TC4 titanium alloy often has problems such as poor wettability of the solder to the base metal, easy formation of brittle compounds in the braze j...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20B23K3/08
CPCB23K1/008B23K1/206B23K3/085
Inventor 张丽霞陈曦孙湛陈勃常青冯吉才
Owner HARBIN INST OF TECH
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