Active coupling agent for contact reaction of graphite and stainless steel and brazing method thereof

A technology of active connection and contact reaction, used in welding media, welding equipment, welding/cutting media/materials, etc., can solve problems such as cracks, welding failures, large differences in thermal expansion coefficients, etc., to ensure mechanical properties and reduce welding. Thermal stress, the effect of improving the degree of vacuum

Active Publication Date: 2020-01-14
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

There are two problems in the welding of graphite materials and stainless steel: one is that the thermal expansion coefficient gap between graphite and stainless steel is large, the higher the welding temperature, the more concentrated the thermal stress in the heat-affected zone of the base metal during the welding cooling process, and cracks may appear and cause Welding failure; the second is that the melting point of stainless steel is much lower than that of graphite, and the service temperature of stainless steel is between -196 ° C and 800 ° C, so the melting point of the solder alloy should be above 1000 ° C, but it should be 150 °C lower than the melting point of stainless steel ℃ (the melting point of stainless steel is about 1300 ℃ ~ 1400 ℃); in view of the above situation, the present invention proposes an active linker and brazing method for the contact reaction between graphite and stainless steel

Method used

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  • Active coupling agent for contact reaction of graphite and stainless steel and brazing method thereof

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Effect test

Embodiment 1

[0023] A kind of active connecting agent for the contact reaction of graphite and stainless steel, comprising pure Cu powder, Ti powder, CuLi10 alloy powder and binding agent, the preparation method of active connecting agent is as follows: by mass fraction, get Ti powder 10%, CuLi10 powder 10% %, 10% binder, 70% Cu powder, and stir evenly to prepare a paste-like active linking agent.

[0024] Further, the particle size of the pure Cu powder is 100-200um, and the purity is greater than 99.99%; the particle size of the CuLi10 alloy powder is 250-350um.

[0025] Further, the binder is sodium silicate.

[0026] In the present invention, Li is used as an active agent and is added in the form of CuLi10 alloy powder. Its chemical properties are more lively, and it is a strong deoxidizer and degasser. At high temperatures, Li+O 2 = LiO 2 , LiO 2 Can form low-melting composite compounds with many oxides, such as Li 2 CrO 4 The melting point is 517°C, and LiO 2 It has a great aff...

Embodiment 2

[0037] A kind of active connecting agent for the contact reaction of graphite and stainless steel, comprising pure Cu powder, Ti powder, CuLi10 alloy powder and binding agent, the preparation method of active connecting agent is as follows: by mass fraction, get Ti powder 15%, CuLi10 powder 40 %, 10% binder, 35% Cu powder, and stir evenly to prepare a paste-like active linker.

[0038] Further, the particle size of the pure Cu powder is 100-200um, and the purity is greater than 99.99%; the particle size of the CuLi10 alloy powder is 150-250um.

[0039] Further, the binder is sodium silicate.

[0040] In the present invention, Li is used as an active agent and is added in the form of CuLi10 alloy powder. Its chemical properties are more lively, and it is a strong deoxidizer and degasser. At high temperatures, Li+O 2 = LiO 2 , LiO 2 Can form low-melting composite compounds with many oxides, such as Li 2 CrO 4 The melting point is 517°C, and LiO 2 It has a great affinity fo...

Embodiment 3

[0051] A kind of active connecting agent for the contact reaction of graphite and stainless steel, comprising pure Cu powder, Ti powder, CuLi10 alloy powder and binding agent, the preparation method of active connecting agent is as follows: by mass fraction, get Ti powder 20%, CuLi10 powder 60% %, binder 10%, Cu powder 10%, stir well and prepare active linking agent into paste.

[0052] Further, the particle size of the pure Cu powder is 75-100um, and the purity is greater than 99.99%; the particle size of the CuLi10 alloy powder is 150-250um.

[0053] Further, the binder is sodium silicate.

[0054] In the present invention, Li is used as an active agent and is added in the form of CuLi10 alloy powder. Its chemical properties are more lively, and it is a strong deoxidizer and degasser. At high temperatures, Li+O 2 = LiO 2 , LiO 2 Can form low-melting composite compounds with many oxides, such as Li 2 CrO 4 The melting point is 517°C, and LiO 2 It has a great affinity fo...

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Abstract

An active coupling agent for contact reaction of graphite and stainless steel is prepared by taking 10-20% of Ti powder, 10-60% of CuLi10 powder, 10% of binder and the balance Cu powder, by mass, anduniformly stirring the powder to obtain the pasty active coupling agent. The brazing method comprises the steps: processing the surface to be welded of a stainless steel block into the corrugated surface, cleaning the surfaces to be welded of a graphite block and the stainless steel block, coating the surfaces with the active coupling agent, combining the graphite block and the stainless steel block into a butt joint sample, pre-coating the contact surface of a fixture and the sample with a brazing resist, fixing and compressing the sample on the fixture, placing the sample in a vacuum chamberof a brazing furnace, applying welding pressure to the sample, carrying out vacuumizing, then heating and insulating the butt joint sample, and cooling the butt joint sample to room temperature alongwith the furnace to complete brazing. By means of a contact reaction principle, the high-reliability, high-density, brazing filler metal-free and brazing flux-free coupling between the graphite and the stainless steel is realized, the brazing temperature of the graphite and the stainless steel can be reduced, and the mechanical property of a matrix material can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of brazing materials for graphite and stainless steel, in particular to an active linker for contact reaction between graphite and stainless steel and a brazing method. Background technique [0002] Graphite is an important non-metallic material with low relative density, high melting point, excellent corrosion resistance, good impact resistance and high thermal conductivity. It is widely used in civil industry, defense industry, aerospace, energy and transportation industry. The welding parts of graphite and stainless steel have the advantages of both, and have broad development prospects in national defense and civilian industries, but the welding of graphite and stainless steel and the welding strength are problems that need to be solved urgently. At present, there are two main ways to connect graphite and stainless steel: mechanical riveting, which uses rivets and other fixtures to connect graphite and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K1/20B23K1/008
CPCB23K1/008B23K1/203B23K35/302
Inventor 龙伟民钟素娟张雷沈元勋路全彬潘建军于新泉
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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