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Vacuum welding method of molybdenum-based graphite

A vacuum welding and graphite technology, applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of low bonding strength, high cost and complicated preparation process of bonding layer, and achieve lower surface energy, higher bonding strength, and higher bonding strength. The effect of specific surface area

Active Publication Date: 2020-04-17
XIAN REFRA TUNGSTEN & MOLYBDENUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The welding methods of molybdenum and its alloys and graphite involved in the above method are all brazed with different additive elements, different numbers of solder layers, and different additive forms, including powder, foil, coating, etc. The disadvantage of this process is that the molybdenum layer requires Sintering preparation, the preparation process is complicated, the cost is high, and the bonding strength of the bonding layer is low

Method used

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  • Vacuum welding method of molybdenum-based graphite
  • Vacuum welding method of molybdenum-based graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment includes the following steps:

[0036] Step 1, powder mixing: uniformly mix 900g of TZM alloy powder and 100g of pore-forming agent ammonium carbonate to obtain a mixture; the average particle size of the TZM alloy powder is 4.0 μm;

[0037] Step 2, powder filling and pressing: evenly fill the TZM alloy powder in the mold cavity of the pressing mold and scrape the upper surface to form a TZM alloy powder layer 4, and then evenly fill the mixture obtained in step 1 in the TZM alloy powder layer Form a mixture layer 2 with a thickness of 3 mm, then assemble the outer mold 3 and press it with the upper punch 1 and the lower punch 5 of the pressing die to obtain a pressed blank; the TZM alloy powder is the same as the TZM alloy powder described in step 1 ; The pressure adopted by the pressing is 150MPa;

[0038] Step 3, degreasing and pre-sintering: the pressed blank obtained in step 2 is placed in a vacuum degreasing furnace for degreasing and pre-sinterin...

Embodiment 2

[0043] This embodiment includes the following steps:

[0044] Step 1, powder mixing: uniformly mix 800g of TZM alloy powder and 200g of pore-forming agent ammonium carbonate to obtain a mixture; the average particle size of the TZM alloy powder is 6.5 μm;

[0045] Step 2, powder filling and pressing: evenly fill the TZM alloy powder in the mold cavity of the pressing mold and scrape the upper surface to form a TZM alloy powder layer 4, and then evenly fill the mixture obtained in step 1 in the TZM alloy powder layer Form a mixture layer 2 with a thickness of 1.5 mm, then assemble the outer mold 3 and press the upper punch 1 and the lower punch 5 of the pressing die to obtain a pressed blank; the TZM alloy powder and the TZM alloy powder described in step 1 Identical; The pressure that described pressing adopts is 100MPa;

[0046] Step 3, degreasing and pre-sintering: the pressed blank obtained in step 2 is placed in a hydrogen degreasing furnace for degreasing and pre-sinteri...

Embodiment 3

[0051] This embodiment includes the following steps:

[0052] Step 1, powder mixing: uniformly mix 850g of TZM alloy powder and 150g of pore-forming agent ammonium carbonate to obtain a mixture; the average particle size of the TZM alloy powder is 7 μm;

[0053] Step 2, powder filling and pressing: evenly fill the TZM alloy powder in the mold cavity of the pressing mold and scrape the upper surface to form a TZM alloy powder layer 4, and then evenly fill the mixture obtained in step 1 in the TZM alloy powder layer A mixture layer 2 with a thickness of 1 mm is formed on the top, and then the outer mold 3 is assembled and pressed with the upper punch 1 and the lower punch 5 of the pressing die to obtain a pressed blank; the TZM alloy powder is the same as the TZM alloy powder described in step 1 ; The pressure adopted by the pressing is 70MPa;

[0054] Step 3, degreasing and pre-sintering: the pressed blank obtained in step 2 is placed in a vacuum degreasing furnace for degreas...

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Abstract

The invention discloses a vacuum welding method of molybdenum-based graphite. The vacuum welding method comprises the following steps that 1, TZM alloy powder and a pore forming agent are mixed uniformly to obtain a mixture; 2, after the TZM alloy powder is loaded, the mixture is loaded, and a pressing blank is obtained by pressing; 3, the pressing blank is degreased and pre-sintered to obtain a pre-sintered blank; 4, the to-be-welded surface of a graphite part is subjected to sandblasting to obtain a to-be-welded graphite part; and 5, the to-be-welded graphite part, a solder layer and the pre-sintered blank are superposed, and then the molybdenum-based graphite is obtained by vacuum hot pressing welding. According to the vacuum welding method, a porous layer is introduced into the pre-sintered blank, a solid solution or a eutecticum is formed by mutual diffusion of the porous layer and the solder under high temperature, thus the solder generates a liquid phase to form the solid solution with TZM, the bonding strength of the solder layer and the pre-sintered blank is improved, meanwhile a carbide is formed by the mutual diffusion of a sandblasting layer of the to-be-welded surfaceof the graphite part and the solder layer, the bonding strength of the graphite part and the solder layer is improved, and the bonding strength of the TZM layer and the graphite layer is improved.

Description

technical field [0001] The invention belongs to the technical field of heterogeneous material welding, and in particular relates to a vacuum welding method for molybdenum-based graphite. Background technique [0002] TZM alloy is a superalloy made by adding Ti and Zr alloying elements to molybdenum. TZM alloy has high recrystallization temperature, small thermal expansion coefficient and thermal conductivity, good machining performance, corrosion resistance and thermodynamic stability, and is widely used in wall materials of nuclear fusion equipment, high temperature thermal field materials, electric vacuum component materials, The X-ray tube supports the target plate material and the like. Graphite is a hexagonal crystal form of carbon. As a low atomic weight material, it has the characteristics of low density, strong heat dissipation ability and stable high temperature mechanical properties. It is known as an ideal high temperature heat dissipation material. Both molybde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20B23K1/00B22F7/02B22F3/11
CPCB22F3/1103B22F7/004B23K1/00B23K1/0008B23K1/008B23K1/20
Inventor 张腾刘晨雨张卫刚温亚辉淡新国林基辉
Owner XIAN REFRA TUNGSTEN & MOLYBDENUM