SPS diffusion welding method for dissimilar material of TZM and graphite

A technology of dissimilar materials and diffusion welding, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of low strength and achieve the effects of low joining temperature, strong operability and simple process flow

Active Publication Date: 2018-12-21
安徽尚欣晶工新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Graphite has a higher melting point and better thermal conductivity than TZM alloys, but its strength is lower. In modern industries, it is often necessary to combine the two for use, such as targets for high-power CT machines, heat transfer components for nuclear fusion reactors, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In the present embodiment, the SPS diffusion welding of TZM and graphite dissimilar materials is carried out as follows:

[0030] 1. Use #400, #800, #1000, #1500, #2000 metallographic sandpaper in sequence to pre-grind the surface of the TZM alloy to be welded, polish the graphite and the pre-grinded TZM alloy, and then place it in alcohol Ultrasonic cleaning; the flatness of the treated TZM alloy and graphite surface to be welded is not greater than 0.1mm, and the roughness is not greater than 0.1μm.

[0031] 2. Pickle the titanium foil in dilute hydrochloric acid with a volume concentration of 5% for 10 minutes, then place it in alcohol for ultrasonic cleaning, and finally dry it for later use.

[0032] 3. Put the processed graphite, titanium foil and TZM alloy in the graphite female mold from bottom to top, and then press it tightly with the upper and lower pressure heads, and at the same time make the titanium foil in the middle of the height of the female mold.

...

Embodiment 2

[0040] In the present embodiment, the SPS diffusion welding of TZM and graphite dissimilar materials is carried out as follows:

[0041] 1. Use #400, #800, #1000, #1500, #2000 metallographic sandpaper in sequence to pre-grind the surface of the TZM alloy to be welded, polish the graphite and the pre-grinded TZM alloy, and then place it in alcohol Ultrasonic cleaning; the flatness of the treated TZM alloy and graphite surface to be welded is not greater than 0.1mm, and the roughness is not greater than 0.1μm.

[0042] 2. Pickle the titanium foil in dilute hydrochloric acid with a volume concentration of 5% for 10 minutes, then place it in alcohol for ultrasonic cleaning, and finally dry it for later use.

[0043] 3. Put the processed graphite, titanium foil and TZM alloy in the graphite female mold from bottom to top, and then press it tightly with the upper and lower pressure heads, and at the same time make the titanium foil in the middle of the height of the female mold.

...

Embodiment 3

[0051] In the present embodiment, the SPS diffusion welding of TZM and graphite dissimilar materials is carried out as follows:

[0052] 1. Use #400, #800, #1000, #1500, #2000 metallographic sandpaper in sequence to pre-grind the surface of the TZM alloy to be welded, polish the graphite and the pre-grinded TZM alloy, and then place it in alcohol Ultrasonic cleaning; the flatness of the treated TZM alloy and graphite surface to be welded is not greater than 0.1mm, and the roughness is not greater than 0.1μm.

[0053] 2. Pickle the titanium foil in dilute hydrochloric acid with a volume concentration of 5% for 10 minutes, then place it in alcohol for ultrasonic cleaning, and finally dry it for later use.

[0054] 3. Put the processed graphite, titanium foil and TZM alloy in the graphite female mold from bottom to top, and then press it tightly with the upper and lower pressure heads, and at the same time make the titanium foil in the middle of the height of the female mold.

...

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Abstract

The invention discloses an SPS diffusion welding method for a dissimilar material of TZM and graphite. The SPS diffusion welding method comprises the following steps: taking a Ti foil as an active intermediate layer, and carrying out diffusion welding on a TZM alloy and graphite at a temperature lower than a recrystallization temperature for base metal through a spark plasma sintering technology to obtain a connection element of the TZM alloy and graphite. Through the welding method, the connection element made from the TZM / graphite dissimilar material, and with high bonding strength, heat dissipation performance and heat resistance can be obtained; and the room-temperature shear strength of a joint can achieve 49.0MPa.

Description

technical field [0001] The invention relates to a welding method of dissimilar materials, in particular to an SPS diffusion welding method of TZM and graphite dissimilar materials. Background technique [0002] TZM alloy is a type of molybdenum alloy that adds trace amounts of Ti and Zr to molybdenum (Mo) to improve the high temperature performance of the material. Under the action of Ti and Zr, the molybdenum element is strengthened. In the alloy, Mo-Ti solid solution and dispersed particles are produced. During this process, the molybdenum matrix has obtained solid solution strengthening of Mo-Ti solid solution and dispersion strengthening of TiC particles. TZM alloy has the characteristics of high melting point, high strength, high elastic modulus, small linear expansion coefficient, low vapor pressure, good electrical and thermal conductivity, strong corrosion resistance and good high-temperature mechanical properties, so it can be widely used in many fields. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/22
CPCB23K20/026B23K20/22
Inventor 张久兴沈学峰韩翠柳黄浩潘亚飞杨新宇
Owner 安徽尚欣晶工新材料科技有限公司
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