A low-temperature joining method of tzm and wre dissimilar alloys

A connection method and alloy technology, applied in welding equipment, metal processing equipment, welding/welding/cutting articles, etc., can solve the problems of low tensile strength of weld seam, high required temperature, deformation of workpiece, etc., and achieve improvement in high temperature Performance and service life, low equipment vacuum requirements, and the effect of reducing connection temperature

Active Publication Date: 2019-11-29
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have many shortcomings: fusion welding is prone to cracks, and the new alloy formed in the molten pool often has strong brittleness, resulting in low tensile strength of the weld, making it difficult to obtain high-strength joints; solid phase diffusion bonding High temperature and long holding time are required for instant liquid phase connection, which leads to time-consuming and energy-consuming connection between the two, and is prone to serious recrystallization problems, resulting in a significant decrease in the mechanical properties of the material and deformation of the workpiece; although the brazing connection temperature However, due to the generally low melting point of solder, brazing is not only difficult to give full play to the advantages of excellent high-temperature mechanical properties of refractory metals, but also the welds are easily cracked during high and low temperature cycles, resulting in unsatisfactory air tightness. Practical application requirements severely limit its scope of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The low-temperature diffusion welding of the TZM / WRe dissimilar alloy of the present embodiment is carried out as follows:

[0042] step 1,

[0043] The surfaces to be welded of TZM alloy and WRe alloy were pre-grinded with #400, #800, #1000, #1500, #2000 metallographic sandpaper in sequence, then polished and ultrasonically cleaned in alcohol.

[0044] Step 2,

[0045] Weigh 0.0158 g of Ti powder with a particle size of 46 μm with an electronic balance (accuracy of 0.1 mg), so as to ensure that the thickness of the titanium active intermediate layer in the later connector is 60-80 μm.

[0046] Step 3,

[0047] Put the treated TZM alloy, Ti powder and WRe alloy into the graphite female mold sequentially from top to bottom, and then press it tightly with the upper and lower pressure heads, and at the same time make the active middle layer of Ti powder be located in the middle of the height of the graphite female mold .

[0048] Step 4,

[0049] Place the graphite mo...

Embodiment 2

[0057] The low-temperature diffusion welding of the TZM / WRe dissimilar alloy of the present embodiment is carried out as follows:

[0058] step 1,

[0059] The surfaces to be welded of TZM alloy and WRe alloy were pre-grinded with #400, #800, #1000, #1500, #2000 metallographic sandpaper in sequence, then polished and ultrasonically cleaned in alcohol.

[0060] Step 2,

[0061] Weigh 0.0158 g of Ti powder with a particle size of 46 μm with an electronic balance (accuracy: 0.1 mg), so as to ensure that the thickness of the Ti active intermediate layer in the later connector is 60-80 μm.

[0062] Step 3,

[0063] Put the treated TZM alloy, Ti powder and WRe alloy into the graphite female mold sequentially from top to bottom, and then press it tightly with the upper and lower pressure heads, and at the same time make the active middle layer of Ti powder be located in the middle of the height of the graphite female mold .

[0064] Step 4,

[0065] Place the graphite mold with ...

Embodiment 3

[0073] The low-temperature diffusion welding of the TZM / WRe dissimilar alloy of the present embodiment is carried out as follows:

[0074] step 1,

[0075] The surfaces to be welded of TZM alloy and WRe alloy were pre-grinded with #400, #800, #1000, #1500, #2000 metallographic sandpaper in sequence, then polished and ultrasonically cleaned in alcohol.

[0076] Step 2,

[0077] Weigh 0.0158 g of Ti powder with a particle size of 46 μm with an electronic balance (accuracy: 0.1 mg), so as to ensure that the thickness of the Ti active intermediate layer in the later connector is 60-80 μm.

[0078] Step 3,

[0079] Put the treated TZM alloy, Ti powder and WRe alloy into the graphite female mold sequentially from top to bottom, and then press it tightly with the upper and lower pressure heads, and at the same time make the active middle layer of Ti powder be located in the middle of the height of the graphite female mold .

[0080] Step 4,

[0081] Place the graphite mold with ...

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Abstract

The invention provides a low-temperature connecting method of a TZM and WRe dissimilar alloy. Ti powder is adopted as an activated middle layer, a TZM alloy and a WRe alloy are subjected to diffusion welding at the temperature lower than the recrystallization temperature of base metal through the spark plasma sintering technology, and a connecting part of the TZM alloy and the WRe alloy is obtained. By means of the welding method, it can be guaranteed that the base metal is not recrystallized, meanwhile, the TZM / WRe dissimilar alloy connecting part high in strength and good in forming is obtained, and the room temperature shear strength of a connector can reach 263 MPa.

Description

technical field [0001] The invention relates to a low-temperature joining method of dissimilar refractory alloys, in particular to a joining method of TZM / WRe dissimilar alloys. Background technique [0002] TZM alloy is a high-temperature alloy formed by adding Ti and Zr with a total amount of no more than 1% in Mo matrix. Compared with pure molybdenum, TZM alloy has higher recrystallization temperature and high temperature strength. TZM alloy is widely used, such as: taking advantage of its good corrosion resistance, it is used in the glass melting furnace and the main shaft of the agitator coated with platinum and rhodium on the glass bulb production line of color picture tube; it is used in the die-casting of non-ferrous metals by taking advantage of its high melting point. Mold: Utilizing its good mechanical properties under high temperature and high pressure, it is used for military components such as gas distribution valve bodies and rocket nozzles on torpedo engines...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/02B23K20/24
CPCB23K20/026B23K20/24B23K2103/18
Inventor 张久兴杨芝韩翠柳胡可杨新宇李志
Owner HEFEI UNIV OF TECH
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