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A kind of brazing flux that is not easy to absorb moisture and preparation method thereof

A brazing agent, a technology that is not easy to absorb, is applied in the field of brazing agent that is not easy to absorb moisture and its preparation, it can solve the problems of large smoke generation and easy moisture absorption, and achieve the effect of reducing the amount of smoke

Active Publication Date: 2021-08-03
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the deficiencies of the above-mentioned technical problems. The present invention proposes a brazing agent that is not easy to absorb moisture and a preparation method, which has the characteristics of convenient operation, good stability, and low cost, and can solve the problem of traditional brazing brazing. The problem that the agent is easy to absorb moisture and generate a lot of smoke

Method used

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  • A kind of brazing flux that is not easy to absorb moisture and preparation method thereof

Examples

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Effect test

Embodiment 1

[0018] A hard brazing flux not easy to absorb moisture, comprising the following raw materials by weight percentage: potassium fluoroborate: 25%, borax: 10%, K 2 [(OH)F 4 B 3 o 3 ] complex: 65%, the K 2 [(OH)F 4 B 3 o 3 ] complex is prepared by potassium hydrogen fluoride and boric acid, and the molar ratio of potassium hydrogen fluoride and boric acid is 2:4.

[0019] A kind of preparation method of hard brazing flux not easy to absorb moisture, comprises the following steps:

[0020] a. Put the borax containing crystal water into a resistance furnace at 430° C. and dry to constant weight, remove the contained crystal water, and obtain dehydrated borax;

[0021] B, take by weighing potassium hydrogen fluoride and boric acid in a molar ratio of 2:4, put it into a stirrer and stir evenly, and place it in a container for reaction. The reaction process is as follows:

[0022] 2KHF 2 +3H 3 BO 3 = K 2 [(OH)F 4 B 3 o 3 ]+5H 2 O;

[0023] c. Put the reaction product ...

Embodiment 2

[0027] A hard brazing flux not easy to absorb moisture, comprising the following raw materials by weight percentage: Potassium fluoroborate: 35%, borax: 5%, K 2 [(OH)F 4 B 3 o 3 ] complex: 60%, the K 2 [(OH)F 4 B 3 o 3 ] complex is prepared by potassium hydrogen fluoride and boric acid, and the molar ratio of potassium hydrogen fluoride and boric acid is 2:5.

[0028] A kind of preparation method of hard brazing flux not easy to absorb moisture, comprises the following steps:

[0029] a. Put the borax containing crystal water into a resistance furnace at 440° C. and dry to constant weight, remove the contained crystal water, and obtain dehydrated borax;

[0030] B, take by weighing Potassium Hydrogen Fluoride and boric acid in a molar ratio of 2:5, put it into a stirrer and stir evenly, place it in a container for reaction, and the reaction process is as follows:

[0031] 2KHF 2 +3H 3 BO 3 = K 2 [(OH)F 4 B 3 o 3 ]+5H 2 O;

[0032] c. Put the reaction product i...

Embodiment 3

[0036] A hard brazing flux not easy to absorb moisture, comprising the following raw materials by weight percentage: potassium fluoroborate: 35%, borax: 10%, K 2 [(OH)F 4 B 3 o 3 ] complex: 55%, the K 2 [(OH)F 4 B 3 o 3 ] complex is prepared by potassium hydrogen fluoride and boric acid, and the molar ratio of potassium hydrogen fluoride and boric acid is 2:3.

[0037] A kind of preparation method of hard brazing flux not easy to absorb moisture, comprises the following steps:

[0038] a. Put the borax containing crystal water into a 420°C resistance furnace and dry to constant weight, remove the contained crystal water, and obtain dehydrated borax;

[0039] B, take by weighing Potassium Hydrogen Fluoride and boric acid in a ratio of 2:3 by molar ratio, put it into a stirrer and stir evenly, place it in a container for reaction, and the reaction process is as follows:

[0040] 2KHF 2 +3H 3 BO 3 = K 2 [(OH)F 4 B 3 o 3 ]+5H 2 O;

[0041] c. Put the reaction produc...

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Abstract

A hard brazing flux not easy to absorb moisture, comprising the following raw materials by weight percentage: Potassium fluoroborate, borax, K 2 [(OH)F 4 B 3 o 3 ] complex; the preparation method comprises the following steps: putting the borax containing crystal water into a resistance furnace at 420-450 DEG C and drying to constant weight, removing the contained crystal water to obtain dehydrated borax; the molar ratio is 2:3 Weigh potassium hydrogen fluoride and boric acid at a ratio of ~5, put them in a stirrer and stir evenly, and put them in a container for reaction; put the reaction product in a vacuum drying oven at 100~120°C and dry it to constant weight before taking it out , get K 2 [(OH)F 4 B 3 o 3 ] complex; will dehydrated borax, K 2 [(OH)F 4 B 3 o 3 ] complexes were crushed, ball milled, and sieved through a 100-mesh sieve for later use; by weight percentage, 25-35% of potassium fluoroborate, 5-10% of borax, and 55-70% of K 2 [(OH)F 4 B 3 o 3 ] complex, put it into the mixing box and mix evenly to get the finished brazing flux; the present invention can solve the problem that traditional brazing flux is easy to absorb moisture and generate a lot of smoke.

Description

technical field [0001] The invention relates to the technical field of brazing materials, in particular to a brazing flux which is not easy to absorb moisture and a preparation method thereof. Background technique [0002] Brazing refers to the brazing process in which the brazing temperature is greater than 400°C, and the main components of the flux used in brazing are borax, boric acid and their mixtures. The main components of the existing brazing flux are borax, boric acid, fluoride, fluoroborate, chloride, etc., and the brazing flux powder is easy to absorb moisture and agglomerate during storage, which makes subsequent use difficult. The moisture absorption of each component is different, resulting in the separation of phases during storage, and the actual components change, which further leads to the deterioration of the welding effect. The existing flux of the type FB102 is the most widely used silver brazing flux, which contains a large amount of potassium fluoride...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/36B23K35/40
CPCB23K35/3606B23K35/40
Inventor 张冠星龙伟民钟素娟董宏伟薛行雁黄俊兰刘晓芳常云峰
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD