Vacuum brazing solder and process of Mo-Cu alloy and stainless steel

A molybdenum-copper alloy and brazing technology, applied in metal processing equipment, welding/cutting medium/material, welding equipment, etc., can solve the problems of long holding time, wide melting temperature range, unfavorable welding production efficiency, etc. Density, short melting time, and the effect of expanding the solid solution limit

Inactive Publication Date: 2012-07-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent No. 2010105280034 discloses a vacuum brazing process for molybdenum-copper alloy and stainless steel with Cu-Mn-Co solder. Compared with amorphous a...

Method used

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  • Vacuum brazing solder and process of Mo-Cu alloy and stainless steel
  • Vacuum brazing solder and process of Mo-Cu alloy and stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Vacuum brazing of molybdenum-copper alloy plate and 1Cr8Ni9Ti austenitic stainless steel butt joint, molybdenum-copper alloy composition is Mo60%-Cu40% (mass fraction), size is 30mm×8mm, thickness is 2.5mm; austenitic stainless steel is 1Cr8Ni9Ti stainless steel , with a size of 30mm×10mm and a thickness of 3.0mm.

[0030] The first step, surface treatment of molybdenum-copper alloy and 1Cr8Ni9Ti stainless steel:

[0031] First, polish the surface of molybdenum-copper alloy and 1Cr8Ni9Ti stainless steel with 800# SiC sandpaper to remove the oxide film on the surface;

[0032] Then put it into acetone, ultrasonically clean it for 30 minutes, take it out and dry it for later use.

[0033] The second step, the assembly of molybdenum-copper alloy and 1Cr8Ni9Ti stainless steel:

[0034] Foil-shaped BNi2 amorphous alloy solder (chemical composition is: Cr 6.5%, Si 5.0%, B 2.7%, Fe 3.5%, C≤0.02%, Ni balance, in mass percent) with a thickness of 50 μm It is placed between th...

Embodiment 2

[0047] Vacuum brazing of lap joints between molybdenum-copper alloy plates and stainless steel plates, the molybdenum-copper alloy composition is Mo50%-Cu50% (mass fraction), the size is 30mm×8mm, and the thickness is 2.5mm; the austenitic stainless steel is 1Cr8Ni9Ti stainless steel, the size It is 30mm×10mm and the thickness is 3.0mm.

[0048] The first step, surface treatment of molybdenum copper alloy and stainless steel:

[0049] First, polish the surface of molybdenum-copper alloy and 1Cr8Ni9Ti stainless steel with 800# SiC sandpaper to remove the oxide film on the surface;

[0050] Then put it in acetone and ultrasonically clean it for 25 minutes, and dry it with hot air.

[0051] The second step, the assembly of molybdenum copper alloy and stainless steel:

[0052] Foil-shaped BNi2 amorphous alloy solder (chemical composition is: Cr 7.5%, Si 3.0%, B 3.5%, Fe 2.5%, C≤0.02%, Ni balance, in mass percent) with a thickness of 70 μm It is placed between the pretreated mol...

Embodiment 3

[0065] The steps are the same as in Example 1, except that the mass percentage of the BNi2 amorphous alloy solder is composed of: Cr 6.8%, Si 3.8%, B 2.9%, Fe 3.1%, C≤0.02%, Ni balance.

[0066] The obtained molybdenum-copper alloy and 1Cr8Ni9Ti stainless steel butt brazing joints have beautiful appearance, and the solder has good wettability to the surface of the molybdenum-copper alloy and 1Cr8Ni9Ti stainless steel. No defects such as microscopic cracks and inclusions were found through metallographic microscope observation. The interface of the brazing zone is well bonded, and the shear strength of the joint reaches 225MPa.

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Abstract

The invention relates to a vacuum brazing solder and a process of Mo-Cu alloy and stainless steel. The process comprises the steps of placing BNi2 amorphous alloy solder between preprocessed Mo-Cu alloy and surface to be brazed of austenitic stainless steel, controlling the joint gap between 40-80mum, gently placing the assembled Mo-Cu alloy and the stainless steel at a uniform temperature zone in a vacuum brazing furnace, vacuumizing and brazing, wherein the BNi2 amorphous alloy solder comprises the components in percentage by mass: 6.5-7.5% of Cr, 3.0-5.0% of Si, 2.7-3.5% of B, 2.5-3.5% of Fe, less than or equal to 0.02% of C and the balance of Ni. The Mo-Cu alloy and stainless steel joint obtained by the process disclosed by the invention have the advantages of little impurity, high density, strong high temperature resisting ability and the like and can be used for manufacturing instrument and meter elements, electronic packaging and high temperature resisting devices.

Description

technical field [0001] The invention relates to a brazing process of molybdenum-copper alloy and stainless steel, in particular to a method for vacuum brazing molybdenum-copper alloy and stainless steel by using amorphous solder, and belongs to the technical field of dissimilar material welding. Background technique [0002] Molybdenum copper alloy has high thermal conductivity, low thermal expansion coefficient and good heat resistance, so it has many uses. Its high thermal conductivity has a good future as a high-power electronic device and heat dissipation device; its low expansion coefficient can be used as a sealing material; its good heat resistance can be used as a high-temperature component, etc. However, when molybdenum-copper alloy and stainless steel are welded, due to the large difference in thermal expansion coefficient and thermal conductivity between the two, a large stress is easily generated at the joint, which increases the tendency of cracks. Moreover, mo...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K1/008B23K103/22
Inventor 王娟李亚江郑德双
Owner SHANDONG UNIV
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