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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 easy agglomeration and hardening, poor activity, and inability to store for a long time.

Active Publication Date: 2011-01-19
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 si...

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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 Patents(China)
IPC IPC(8): B23K35/362
Inventor 邓键
Owner 上海斯米克焊材有限公司