SPS connecting method of WRe/TZM/graphite

A connection method and graphite technology, applied in the field of SPS sintering connection of WRe/TZM/graphite, can solve the problems of serious material loss, alloy surface carbonization, complicated process, etc., and achieve the reduction of production cycle and cost, dense sintering, and simple process flow Effect

Active Publication Date: 2019-08-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, obtaining WRe / TZM / graphite joints requires multiple steps. Usually, WRe alloy and TZM alloy are prepared by sintering first, then WRe alloy and TZM alloy are diffused and connected, and then the WRe-TZM alloy joint is connected with graphite. The process is complicated and the cost is high, and each step will cause carbonization on the surface of the alloy. In the subsequent steps, the carbonized layer needs to be removed by machining, and the material loss is serious.

Method used

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  • SPS connecting method of WRe/TZM/graphite

Examples

Experimental program
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Embodiment 1

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

[0041] 1. Take the graphite to be connected, pre-grind, polish, ultrasonically clean and vacuum-dry the graphite surface to be welded to ensure that the flatness of the 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. Weigh W-5% Re alloy powder and TZM alloy powder raw materials as required.

[0044] 4. Take the graphite die and install the bushing and the lower pressure head, put the weighed TZM alloy powder and WRe alloy powder into the graphite mold in turn, and use a manual hydraulic press to pre-press respectively, the pressure is 10MPa, and the pressure is maintained for 2min , and the...

Embodiment 2

[0052] In the present embodiment, the SPS diffusion welding of TZM and graphite dissimilar materials is carried out as follows:

[0053] 1. Take the graphite to be connected, pre-grind, polish, ultrasonically clean and vacuum-dry the graphite surface to be welded to ensure that the flatness of the graphite surface to be welded is not greater than 0.1mm and the roughness is not greater than 0.1μm.

[0054] 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.

[0055] 3. Weigh W-5% Re alloy powder and TZM alloy powder raw materials as required.

[0056] 4. Take the graphite die and install the bushing and the lower pressure head, put the weighed TZM alloy powder and WRe alloy powder into the graphite mold in turn, and use a manual hydraulic press to pre-press respectively, the pressure is 10MPa, and the pressure is maintained for 2min , and th...

Embodiment 3

[0064] In the present embodiment, the SPS diffusion welding of TZM and graphite dissimilar materials is carried out as follows:

[0065] 1. Take the graphite to be connected, pre-grind, polish, ultrasonically clean and vacuum-dry the graphite surface to be welded to ensure that the flatness of the graphite surface to be welded is not greater than 0.1mm and the roughness is not greater than 0.1μm.

[0066] 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.

[0067] 3. Weigh W-5% Re alloy powder and TZM alloy powder raw materials as required.

[0068] 4. Take the graphite die and install the bushing and the lower pressure head, put the weighed TZM alloy powder and WRe alloy powder into the graphite mold in turn, and use a manual hydraulic press to pre-press respectively, the pressure is 10MPa, and the pressure is maintained for 2min , and th...

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Abstract

The invention discloses an SPS connecting method of WRe/TZM/graphite. The SPS connecting method comprises the steps that a graphite gradient mould is adopted, gradient sintering of WRe alloy powder and TZM alloy powder is achieved through an SPS technology, and a titanium foil serves as an intermediate transition layer to achieve dissimilar material connection between the TZM alloy powder and a graphite block body, so that a WRe/TZM/graphite dissimilar material connecting piece is obtained. Through the connecting method, the WRe/TZM/graphite dissimilar material connecting piece which is densein sintering, uniform in connecting surface diffusion, high in bonding strength, good in heat dissipation performance and good in thermal shock resistance can be obtained, the density of a WRe alloy layer reaches 98.07%, the density of a TZM alloy layer reaches 97.98%, the connecting surface diffusion is uniform, the connector room temperature shearing strength of the WRe/TZM side can reach 303.9MPa, and the connector room temperature shearing strength of the TZM/graphite side can reach 31.2 MPa.

Description

technical field [0001] The invention relates to a sintering connection method of dissimilar materials, in particular to a SPS sintering connection method of WRe / TZM / graphite. Background technique [0002] WRe alloy is an alloy composed of W and Re. W has high melting point, high temperature strength, good heat dissipation performance, and high atomic number. It can excite strong X-rays under electron bombardment, but W has a notch sensitive effect, which is easy to cause cracks. Recrystallization temperature of Re is 500°C higher than that of W, and Re has no plastic-brittle transition temperature. Therefore, the addition of Re can significantly improve the room temperature brittleness of W, reduce the plastic-brittle transition temperature, and enhance the mechanical properties of W in a certain high temperature region. TZM alloy is a widely used molybdenum-based alloy. It is mainly used in aerospace, power generation, nuclear reactors, military, medical equipment and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/03B22F7/04C22C27/04
CPCB22F3/03B22F3/105B22F7/04C22C27/04
Inventor 张久兴沈学峰施加利韩翠柳潘亚飞杨新宇
Owner HEFEI UNIV OF TECH
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