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A connection method of tzm alloy and wre alloy assisted by electric field

A connection method and electric field-assisted technology, which is applied in the field of connection of dissimilar high-temperature alloys, can solve the problems of high requirements on the surface cleanliness of metal parts and equipment vacuum, difficult joints with high bonding strength, and high temperature required to improve high-temperature performance and service life, inhibition of grain growth, and short holding time

Active Publication Date: 2019-03-08
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have many disadvantages: it is difficult to make joints with high bonding strength; the cleanliness of the metal surface and the vacuum degree of the equipment are very high; the solid phase diffusion connection and the instantaneous liquid phase connection require high temperature and long holding time, resulting in The connection between the two is time-consuming and energy-consuming; fusion welding is prone to cracks; although the connection temperature of brazing is low, because the melting point of the solder is generally low, it is difficult to make joints that can be used at high temperatures by brazing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The SPS diffusion connection of TZM alloy and WRe alloy in this embodiment is carried out according to the following steps:

[0033] step 1,

[0034] Use #400, #800, #1000, #1200, #1500, #2000 metallographic sandpaper to pre-grind the surfaces to be connected of TZM alloy and WRe alloy in sequence, then polish and ultrasonically clean in alcohol; the treated TZM alloy The flatness and roughness of the surface to be connected are 0.09 mm and 0.05 μm, respectively, and the flatness and roughness of the surface to be connected of the treated WRe alloy are 0.1 mm and 0.08 μm, respectively.

[0035] Step 2,

[0036] Put the treated WRe alloy and TZM alloy into the graphite female mold sequentially from bottom to top, and then press it tightly with the upper and lower indenters, and at the same time make the surface to be connected be located in the middle of the height of the graphite female mold;

[0037] Step 3,

[0038] Place the graphite mold with the parts to be conn...

Embodiment 2

[0046] The SPS diffusion connection of TZM alloy and WRe alloy in this embodiment is carried out according to the following steps:

[0047] step 1,

[0048] Use #400, #800, #1000, #1200, #1500, #2000 metallographic sandpaper to pre-grind the surfaces to be connected of TZM alloy and WRe alloy in sequence, then polish and ultrasonically clean in alcohol; the treated TZM alloy The flatness and roughness of the surface to be connected are 0.08 mm and 0.06 μm, respectively, and the flatness and roughness of the surface to be connected of the treated WRe alloy are 0.09 mm and 0.1 μm, respectively.

[0049] Step 2,

[0050] Put the treated WRe alloy and TZM alloy into the graphite female mold sequentially from bottom to top, and then press it tightly with the upper and lower indenters, and at the same time make the surface to be connected be located in the middle of the height of the graphite female mold;

[0051] Step 3,

[0052] Place the graphite mold with the parts to be connec...

Embodiment 3

[0060] The SPS diffusion connection of TZM alloy and WRe alloy in this embodiment is carried out according to the following steps:

[0061] step 1,

[0062] Use #400, #800, #1000, #1200, #1500, #2000 metallographic sandpaper to pre-grind the surfaces to be connected of TZM alloy and WRe alloy in sequence, then polish and ultrasonically clean in alcohol; the treated TZM alloy The flatness and roughness of the surface to be connected are 0.06 mm and 0.07 μm, respectively, and the flatness and roughness of the surface to be connected of the treated WRe alloy are 0.09 mm and 0.05 μm, respectively.

[0063] Put the treated WRe alloy and TZM alloy into the graphite female mold sequentially from bottom to top, and then press it tightly with the upper and lower indenters, and at the same time make the surface to be connected be located in the middle of the height of the graphite female mold;

[0064] Step 3,

[0065] Place the graphite mold with the parts to be connected in the furn...

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Abstract

The invention discloses a method for connecting a TZM alloy and a WRe alloy under assistance of an electric field. On the premise that a middle transition layer is not added, diffusion connection under the assistance of the electric field is performed on the TZM alloy and the WRe alloy by use of a spark plasma sintering system, so that a connected part of the TZM alloy and the WRe alloy is obtained. By means of the connection method, the TZM-WRe dissimilar alloy connected part with high strength and good formation can be obtained, and the highest room-temperature three-point bending strength of a joint can reach 935 MPa.

Description

technical field [0001] The invention relates to a connection method of dissimilar superalloys, in particular to a connection method of TZM alloy and WRe alloy. Background technique [0002] 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. It exhibits good mechanical properties under high temperature and high pressure. It is widely used in the military industry, such as the valve body in the torpedo engine, the rocket nozzle, the gas pipeline, and the throat lining of the nozzle. Tungsten-rhenium alloy has a series of excellent properties, such as high melting point, high strength, high hardness, high plasticity, high recrystallization temperature, high resistivity, low vapor pressure, low electron work function and low plastic-brittle transition temperature, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K10/02
CPCB23K10/02B23K2103/18
Inventor 张久兴杨芝胡可杨新宇胡大为臧孝华仝颖刚沈岩
Owner HEFEI UNIV OF TECH
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