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Cream-like silver brazing fluxes

A silver flux and paste technology, applied in the field of silver flux, can solve the problems of poor spreadability of silver solder, easy to agglomerate and harden, and poor activity.

Active Publication Date: 2008-06-04
上海斯米克焊材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the silver solder QJ01 (H 3 BO 3 -KBF 4 ) and QJ102 (B 2 o 3 -KF-KBF 4 ) The fluoride KBF4, KF and KBF4 in the composition lead to two problems in use: QJ101 (H3BO 3 -KBF 4 ) The activity of the paste is poor, so that the spreadability of the silver solder is not good, and QJ102 (B 2 o 3 -KF-KBF 4 ) into a paste, because it is easy to agglomerate and harden, it cannot be stored for a long time

Method used

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  • Cream-like silver brazing fluxes

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Embodiment Construction

[0018] Below, further illustrate the present invention in conjunction with specific embodiment:

[0019] A kind of pasty silver brazing flux, its formula is as follows (weight %):

[0020] KF 25~50%;

[0021] KHF2 15-30%;

[0022] The balance is: H 3 BO 3 .

[0023] The paste silver brazing flux is suitable for silver brazing of carbon steel, stainless steel, copper and copper alloys.

[0024] The paste silver flux needs to be configured during use, and the chemical reaction formula that reacts during configuration is:

[0025] KF+H 3 BO 3 →KBF(OH) 3 ;

[0026] KHF 2 +H 3 BO 3 →K 2 [(OH)F 4 B 3 o 3 ]+5H 2 O;

[0027] The reaction product: KBF(OH) 3 and K 2 [(OH)F 4 B 3 o 3 ] is the final composition of the paste silver solder.

[0028] In the preferred embodiment of the present invention, it consists of:

[0029] KF 32%

[0030] KHF 2 18%

[0031] h 3 BO 3 50%.

[0032] Measure the spreading area of ​​the above-mentioned silver brazing flux fo...

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Abstract

The invention relates to silver welding suitable for carbon-steel, stainless steel, copper and copper alloy. The paste-shaped silver flux has the composition of KF-KHF2-H3BO3 suitable for carbon-steel, stainless steel, copper and copper alloy. The composition (weight percentage) is 25% to 50% of K, 15% to 30% of KHF2, 15% to 30% of H3BO3 and the paste-shaped silver flux occupies residual quantity. The paste-shaped silver flux has the advantages of good activity and no agglomeration.

Description

technical field [0001] The invention relates to a silver brazing flux. Background technique [0002] Currently. In the silver brazing of carbon steel, stainless steel, copper and copper alloys, the most widely used silver brazing flux in my country is QJ101 (composition is 30% H 3 BO 3 -70%KBF 4 ) and QJ102 (composition is 35% B 2 o 3 -42%KF-23%KBF 4 ), the supply state is powder, but most users use it by adding water to make a paste. Due to the silver solder QJ01 (H 3 BO 3 -KBF 4 ) and QJ102 (B 2 o 3 -KF-KBF 4 ) The fluoride KBF4, KF and KBF4 in the composition lead to two problems in use: QJ101 (H3BO 3 -KBF 4 ) The activity of the paste is poor, so that the spreadability of the silver solder is not good, and QJ102 (B 2 o 3 -KF-KBF 4 ) into a paste, because it is easy to agglomerate and harden, it cannot be stored for a long time. Contents of the invention [0003] The present invention aims to solve the above-mentioned various problems of the existing s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362
Inventor 邓键
Owner 上海斯米克焊材有限公司
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