A kind of vacuum brazing method of molybdenum alloy and graphite

A brazing method and molybdenum alloy technology, applied in the field of connection of heterogeneous materials, can solve the problems of increasing wettability, cohesiveness, unsuitability for mass production, and low production efficiency, so as to improve wettability and be suitable for large batches The effect of improving production and production efficiency

Active Publication Date: 2021-01-01
ATTL (BEIJING) ADVANCED MATERIALS CO LTD +2
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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 these methods are all brazed with different added elements, different layers of brazing material, and different added forms, including powder, foil, coating, etc., and changing the structure of the welding surface to increase brazing. The contact area between the material and the base metal, and the welding method for the purpose of increasing the wettability and cohesion all require pressure welding. The disadvantage of this process is that only one product can be welded per heat, the production efficiency is low, the cost is high, and it is not suitable for large quantities. Production

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  • A kind of vacuum brazing method of molybdenum alloy and graphite
  • A kind of vacuum brazing method of molybdenum alloy and graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The vacuum brazing method of present embodiment molybdenum alloy and graphite is specifically as follows:

[0028] (1) After cleaning the molybdenum alloy and the graphite to be welded, put them into a high-temperature vacuum furnace for high-temperature vacuum degassing treatment. The treatment temperature is 1600°C, the holding time is 60min, and the treatment vacuum degree is 4×10 -4 Pa, cooled to less than 100 ℃ out of the furnace.

[0029] (2) Vacuum packaging the molybdenum alloy to be welded out of the oven, place a piece of titanium sheet with a thickness of 0.3mm on the surface of the graphite to be welded to be welded, and put it into a vacuum furnace together to activate the graphite to be welded, The treatment temperature is 1720°C, the holding time is 20min, and the vacuum degree is 4.5×10 -4 Pa, cooled to within 60°C and released from the furnace to obtain activated graphite.

[0030] (3) the Ti90Cr5Ta that thickness is 0.2mm is inserted between the surf...

Embodiment 2

[0033] The vacuum brazing method of present embodiment molybdenum alloy and graphite is specifically as follows:

[0034] (1) After cleaning the molybdenum alloy and the graphite to be welded, put them into a high-temperature vacuum furnace for high-temperature vacuum degassing treatment. The treatment temperature is 1550°C, the holding time is 50min, and the treatment vacuum degree is 3×10 -4 Pa, cooled to less than 100 ℃ out of the furnace.

[0035] (2) Vacuum-encapsulate the molybdenum alloy to be welded out of the furnace, place a piece of titanium sheet with a thickness of 0.4mm on the surface of the graphite to be welded, and put it into the vacuum furnace together with the surface to be welded of the graphite to be welded. Activation treatment, the treatment temperature is 1750°C, the holding time is 30min, and the vacuum degree is 4.5×10 -4 Pa, cooled to within 60°C and released from the furnace to obtain activated graphite.

[0036] (3) between the surface to be wel...

Embodiment 3

[0039] The vacuum brazing method of present embodiment molybdenum alloy and graphite is specifically as follows:

[0040] (1) After cleaning the molybdenum alloy and the graphite to be welded, put them into a high-temperature vacuum furnace for high-temperature vacuum degassing treatment. The treatment temperature is 1550°C, the holding time is 35min, and the treatment vacuum degree is 3.5×10 -4 Pa, cooled to less than 100 ℃ out of the furnace.

[0041] (2) Vacuum packaging the molybdenum alloy to be welded out of the furnace, place a piece of titanium sheet with a thickness of 0.2mm on the surface of the graphite to be welded, and put it into the vacuum furnace together to activate the graphite to be welded, The treatment temperature is 1700°C, the holding time is 25min, and the vacuum degree is 3×10 -4 Pa, cooled to within 60°C and released from the furnace to obtain activated graphite.

[0042] (3) Ti85Cr10Ta5 (that is, in the solder, the mass percentage of Ti is 85% in t...

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Abstract

The invention belongs to the technical field of connection of heterogeneous materials and particularly relates to a molybdenum alloy and graphite vacuum brazing method. The method comprises a graphiteactivation step and a vacuum brazing step. The molybdenum alloy and graphite vacuum brazing method has the beneficial effects that the process design is reasonable, the use effect is good, and a molybdenum alloy and graphite composite joint obtained through the method is high in remelting temperature, can be in service at the temperature of below 1,500 DEG C and is stable in performance and freeof cracking.

Description

technical field [0001] The invention belongs to the technical field of connecting heterogeneous materials, and in particular relates to a vacuum brazing method for molybdenum alloy and graphite. Background technique [0002] Molybdenum alloy has the characteristics of high melting point, small thermal expansion coefficient, good thermal and electrical conductivity, and good thermodynamic stability. Target plate, rotor support rod, bearing sleeve, etc.). Graphite is a hexagonal crystal form of carbon. As a low atomic weight material, it has a low density, a very high melting point and thermal shock resistance, and is an excellent high temperature resistant material. Molybdenum alloy and graphite have high melting point, good thermal and electrical conductivity, graphite density is small, can effectively reduce material weight, molybdenum alloy and graphite welded composite parts have been widely used in nuclear fusion reactor materials, industrial and medical CT machines An...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/19B23K1/20
CPCB23K1/008B23K1/19B23K1/206
Inventor 董帝刘国辉吕周晋熊宁康聚磊王寅
Owner ATTL (BEIJING) ADVANCED MATERIALS CO LTD
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