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Method for brazing TZM alloy by means of Ti-Ni high-temperature brazing filler metal

A high-temperature solder, ti-ni technology, applied in welding media, welding equipment, metal processing equipment, etc., can solve the problems of restricting the application of TZM alloys, reducing the mechanical properties of joints, and unsuitable for mass production of solder costs, so as to achieve high temperature retention. Performance, simple production method, effect of suppressing excessive erosion

Active Publication Date: 2016-08-10
HARBIN INST OF TECH AT WEIHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regarding the brazing of TZM alloys, domestic and foreign scholars mostly use silver-based solders in their research, and a large number of intermetallic compounds are formed in the welded joints, resulting in a decrease in the mechanical properties of the joints; at the same time, the central area of ​​the weld is mainly silver-rich phase, making TZM alloy parts are difficult to apply in high temperature environment, and the corrosion resistance of joints will also decrease; considering the cost of solder, it is not suitable for mass production, which further limits the further application of TZM alloy in industry

Method used

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  • Method for brazing TZM alloy by means of Ti-Ni high-temperature brazing filler metal
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  • Method for brazing TZM alloy by means of Ti-Ni high-temperature brazing filler metal

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Experimental program
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specific Embodiment approach 1

[0024] Step 1. Weigh 30~40 parts of Ti wire (foil) and 60~70 parts of Ni wire (foil), put them into the crucible of vacuum melting furnace; vacuumize to 5.0×10 -3 After filling the Pa with argon, the alloy solder ingot is obtained by repeated arc melting 7-8 times in the crucible; the solder ingot is cut into foils with a width of 5-6mm and a thickness of 0.5-0.6mm with a wire cutting machine. And use SiC sandpaper to polish the Ti-Ni brazing foil to a thickness of 0.1 mm;

[0025] Step 2. Polish the surface of the TZM alloy sample to be welded with 500 mesh, 800 mesh and 1200 mesh SiC sandpaper in sequence until the surface is bright;

[0026] Step 3. Put the prepared Ti-Ni brazing foil and TZM alloy samples into the acetone solution, ultrasonically clean them for 15 minutes, and then dry them for later use;

[0027] Step 4, the cleaned TZM alloy sample and foil brazing filler metal, according to the order of TZM alloy / , TiNi brazing filler metal foil / , TZM alloy as follow...

specific Embodiment approach 2

[0029] Step 1. Weigh 34.5 parts of Ti wire (foil) and 65.5 parts of Ni wire (foil), and put them into the crucible of the vacuum melting furnace; vacuumize to 5.0×10 -3 After filling the Pa with argon, the alloy solder ingot is obtained by repeated arc melting 7-8 times in the crucible; the solder ingot is cut into foils with a width of 5-6mm and a thickness of 0.5-0.6mm with a wire cutting machine. And use SiC sandpaper to polish to a thickness of about 0.1mm;

[0030] Step 2. Polish the surface of the TZM alloy sample to be welded with 500 mesh, 800 mesh and 1200 mesh SiC sandpaper in sequence until the surface is bright;

[0031] Step 3. Put the prepared foil and TZM alloy samples into the acetone solution, ultrasonically clean them for 15 minutes, and then dry them for later use;

[0032] Step 4: Assemble the cleaned TZM alloy sample and foil solder in the order of TZM alloy / TiNi solder foil / TZM alloy. At the same time, an assembly pressure of 2KPa is applied to ensure t...

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Abstract

The invention discloses a method for brazing a TZM alloy by means of Ti-Ni high-temperature brazing filler metal, and particularly provides the Ti-Ni high-temperature brazing filler metal suitable for brazing the TZM alloy in the vacuum environment. The Ti-Ni high-temperature brazing filler metal is prepared from Ti and Ni. The problems that a TZM alloy brazing joint obtained through silver based brazing filler metal is low in use temperature, prone to oxidization, poor in mechanical property, high in raw material price and the like are solved. The method specifically comprises the steps that a Ti wire (foil) and a Ni wire (foil) are weighed according to the weight ratio to prepare an alloy brazing filler metal ingot, and a foil piece is machined through a wire cutting machine and polished; the to-be-welded surface of the TZM alloy is polished to be smooth; the brazing filler metal and a to-be-welded TZM alloy sample are subjected to ultrasonic cleaning with an acetone solution; the brazing filler metal foil piece and the TZM alloy are assembled; and an assembly is put into a vacuum brazing furnace, and heating brazing is carried out. The manufacturing method is simple and convenient, the shear strength of the obtained TZM alloy brazing joint can reach 121 MPa, and high application value is achieved.

Description

technical field [0001] The invention relates to a brazing method, in particular to a method for brazing a TZM alloy with Ti-Ni high-temperature solder. Background technique [0002] The composition (wt%) of TZM alloy is Ti 0.4%~0.55%, Zr 0.06%~0.12%, C 0.01%~0.04%, the balance is Mo, and the recrystallization temperature is between 1200℃~1350℃. TZM alloy has high melting point, small thermal expansion coefficient, excellent thermal and electrical conductivity, strong wear resistance and corrosion resistance, good thermal shock resistance and mechanical properties, etc., in metallurgy, chemistry and metal processing, aviation and nuclear industry, Electronic industry and military industry and other fields have been widely used. [0003] Studies have shown that welding techniques such as electron beam welding, laser welding, fusion welding, friction stir welding and brazing have been successfully applied to the connection of TZM alloys and other materials, and welded joints w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/19B23K1/20B23K35/40B23K35/30
CPCB23K1/008B23K1/19B23K1/20B23K35/3033B23K35/40B23K2103/08
Inventor 宋晓国田骁彭赫力刘海建袁勇赵洪运李中权
Owner HARBIN INST OF TECH AT WEIHAI