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A kind of preparation method of yttrium oxide microspheres used in titanium alloy vacuum brazing choke agent

A technology of yttrium oxide and titanium alloy, which is applied in the field of welding technology and material preparation, can solve the problems such as the decrease of fluidity of the blocking agent, affecting the normal use, affecting the processing efficiency of brazing, and achieving the decrease of surface tension, the improvement of welding resistance, The effect of good solder mask effect

Active Publication Date: 2020-08-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too much increase in the oxides in the flow blocking agent formula will lead to a decrease in the fluidity of the flow blocking agent, which will affect its normal use, and multiple application of the flow blocking agent needs to be done after the last applied flow blocking agent is completely dry. Applying it will seriously affect the efficiency of brazing processing

Method used

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  • A kind of preparation method of yttrium oxide microspheres used in titanium alloy vacuum brazing choke agent
  • A kind of preparation method of yttrium oxide microspheres used in titanium alloy vacuum brazing choke agent

Examples

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Effect test

Embodiment 1

[0027] A method for preparing surface roughened yttrium oxide microspheres for titanium alloy vacuum brazing flow inhibitors includes the following steps:

[0028] (1) Add yttrium nitrate to deionized water and stir for 10 minutes to obtain an aqueous solution of yttrium nitrate. The mass fraction of the yttrium nitrate solution is 5%. Sodium oleate is added to deionized water and stirred for 10 minutes to fully dissolve the sodium oleate solution. , The mass fraction of the sodium oleate aqueous solution is 5%, while stirring, add the yttrium nitrate aqueous solution dropwise to the sodium oleate aqueous solution. After the dropwise addition is completed, the temperature is raised to 60°C, and the stirring is continued for 30 minutes. After full reaction, the precipitate is filtered out. The filtered precipitate was washed 5 times with deionized water, and after drying, the yttrium oleate complex was obtained. The molar ratio of yttrium nitrate to sodium oleate is controlled at ...

Embodiment 2

[0035] A method for preparing surface roughened yttrium oxide microspheres for titanium alloy vacuum brazing flow inhibitors includes the following steps:

[0036] (1) Add yttrium nitrate to deionized water and stir for 30 minutes to obtain an aqueous solution of yttrium nitrate. The mass fraction of yttrium nitrate aqueous solution is 15%. Sodium oleate is added to deionized water and stirred for 30 minutes to fully dissolve the sodium oleate solution. , The mass fraction of the sodium oleate aqueous solution is 15%, while stirring, add the yttrium nitrate aqueous solution dropwise to the sodium oleate aqueous solution. After the dropwise addition is completed, the temperature is raised to 80°C and the stirring is continued for 1 hour. After full reaction, the precipitate is filtered out. The filtered precipitate was washed 5 times with deionized water, and after drying, the yttrium oleate complex was obtained. The molar ratio of yttrium nitrate to sodium oleate is controlled at...

Embodiment 3

[0043] A method for preparing surface roughened yttrium oxide microspheres for titanium alloy vacuum brazing flow inhibitors includes the following steps:

[0044] (1) Add yttrium nitrate to deionized water and stir for 20 minutes to obtain an aqueous solution of yttrium nitrate. The mass fraction of the yttrium nitrate solution is 10%. Sodium oleate is added to deionized water and stirred for 20 minutes to fully dissolve the sodium oleate solution. , The mass fraction of the sodium oleate aqueous solution is 10%, while stirring, add the yttrium nitrate aqueous solution dropwise to the sodium oleate aqueous solution. After the dropwise addition is completed, the temperature is raised to 70°C, and the stirring is continued for 45 minutes. After full reaction, the precipitate is filtered out. The filtered precipitate was washed 5 times with deionized water, and after drying, the yttrium oleate complex was obtained. The molar ratio of yttrium nitrate to sodium oleate is controlled a...

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Abstract

The invention relates to the fields of welding technologies and material preparation, and aims to provide a preparation method of yttrium oxide microspheres for a titanium alloy vacuum brazing stop-off agent. The preparation method comprises the steps that an yttrium nitrate water solution is dropwise added into a sodium oleate water solution through stirring for reaction, and after precipitates are cleaned and dried, an yttrium oleate complex is obtained; the yttrium oleate complex, lauric acid, 1,2-epoxypropane, triethanolamine, 1h-benzotriazole and glutaraldehyde are added into butyl alcohol and stirred; a mixture of sodium chloride, dodecyltrimethylammonium bromide and deionized water is added; yttrium chloride and potassium fluoborate are added and stirred; styrene-acrylic emulsion isadded and stirred; solid powder is centrifugally collected and subjected to heat treatment after being cleaned and dried, and the yttrium oxide microspheres with rough surfaces are obtained. The surfaces of the microspheres prepared through the method has a rough structure, the surface tension is greatly reduced, the higher wetting resistance to fusion brazing filler metal is achieved, and thus,a stop-off agent product has the better resistance welding effect.

Description

Technical field [0001] The invention relates to the field of welding technology and material preparation, in particular to a method for preparing surface roughened yttrium oxide microspheres used for titanium alloy vacuum brazing flow inhibitors. Background technique [0002] The flow inhibitor is a material used to protect the surface of the welded metal during the brazing process. It can effectively prevent the molten solder from flowing freely to the surface that does not need to be welded at the brazing temperature. After brazing is completed, the residual components of the flow blocking agent can be removed in a certain way without polluting and corroding the brazing metal. [0003] In the process of vacuum brazing of titanium alloy, since titanium element is an active metal element with higher activity, the oxide component (such as aluminum oxide) in conventional flow blocking agents is likely to react with titanium element in titanium alloy, resulting in Titanium alloy is o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362B23K37/06
CPCB23K35/362B23K37/06
Inventor 蔡伟炜张玲洁祁更新陈晓樊先平杨辉
Owner ZHEJIANG UNIV
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