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Hard brazing flux not prone to moisture absorption and preparation method
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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: 2020-02-04
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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[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
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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 hydrogenfluoride and boric acid, and the molar ratio of potassium hydrogenfluoride 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;
[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 PotassiumHydrogenFluoride 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;
[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 PotassiumHydrogenFluoride 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
The invention discloses a hard brazing flux not prone to moisture absorption. The hard brazing flux comprises the following raw materials including potassium fluoborate, borax and a K2[(OH) F4B3O3] complex in percentage by weight. A preparation method comprises the following steps that the borax containing crystal water is placed into a resistance furnace at the temperature of 420 DEG C-450 DEG Cto be dried to the constant weight, the contained crystal water is removed, and dehydrated borax is obtained; potassiumbifluoride and boric acid are weighed according to the molar ratio of 2: (3-5),placed into a stirrer to be stirred uniformly and placed into a container to react; a reaction product is placed into a vacuum drying box at the temperature of 100 DEG C-120 DEG C to be dried to the constant weight and then taken out, and the K2[(OH) F4B3O3] complex is obtained; the dehydrated borax and the K2[(OH) F4B3O3] complex are crushed and subjected to ball milling correspondingly and screened through a 100-mesh screen for standby application; and 25%-35% of the potassium fluoborate, 5%-10% of the borax and 55%-70% of the K2[(OH) F4B3O3] complex are weighed in percentage by weight and placed into a mixing box to be mixed uniformly, and the finished hard brazing flux is obtained. According to the hard brazing flux not prone to moisture absorption, the problems that a traditional brazing flux for hard brazing is prone to moisture absorption and large in smoke amount can be solved.
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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