A kind of aluminum brazing flux for aluminum alloy honeycomb plate brazing and preparation method thereof

A honeycomb panel and aluminum alloy technology, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of poor brazing performance of aluminum alloy honeycomb panels and the reduction of flux activity temperature, so as to improve flux activity and reduce Flux viscosity, low cost effect

Active Publication Date: 2022-02-01
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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Problems solved by technology

[0007] In order to solve the problems of low matching degree, poor flux activity, and deterioration of the brazing performance of aluminum alloy honeycomb panels caused by the active temperature of the Zn-Al flux used for aluminum alloy brazing higher than the melting temperature of the solder, the present invention provides a A kind of aluminum flux for aluminum alloy honeycomb plate brazing and preparation method thereof, this aluminum flux adopts KBe 2 f 5 -KAIF 4 Binary flux matrix to replace Zn-Al flux and add KHF to it 2 As an active material, the active temperature of the flux is reduced, so that it can be matched with the solder, and the activity is improved during brazing, which solves the problem of poor brazing performance of aluminum alloy honeycomb panels.

Method used

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  • A kind of aluminum brazing flux for aluminum alloy honeycomb plate brazing and preparation method thereof

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Embodiment 1

[0028] An aluminum flux for aluminum alloy honeycomb plate brazing, made of 83.5% by mass percentage of binary flux matrix and 16.5% by mass of active material, said binary flux matrix is ​​KBe 2 f 5 -KAIF 4 , and the molar ratio of the two is KBe 2 f 5 :KAlF 4 =50:50; the active substance is KHF 2 .

[0029] The preparation method of aluminum flux for aluminum alloy honeycomb plate brazing comprises the following steps:

[0030] 1) Weigh KBe according to the above ratio 2 f 5 and KAlF 4 Binary flux matrix, mixed evenly and placed in a platinum crucible, then placed the platinum crucible in a muffle furnace to raise the temperature to 480°C and keep it warm for 30 minutes to form a molten flux liquid;

[0031] 2) Weigh the active material according to the above ratio and pour it into the molten flux solution in step 1), keep the temperature at 480°C and stir it thoroughly, then stand still for 10 minutes, and then cool naturally to form a flux glass body;

[0032]3) ...

Embodiment 2

[0035] An aluminum flux for aluminum alloy honeycomb plate brazing, made of 89.5% by mass percentage of binary flux matrix and 10.5% by mass of active material, said binary flux matrix is ​​KBe 2 f 5 -KAIF 4 , and the molar ratio of the two is KBe 2 f 5 :KAlF 4 =70:30; the active substance is KHF 2 .

[0036] The preparation method of the aluminum flux for aluminum alloy honeycomb plate brazing comprises the following steps:

[0037] 1) Weigh KBe according to the above ratio 2 f 5 and KAlF 4 Binary flux matrix, mixed evenly and placed in a platinum crucible, then put the platinum crucible in a muffle furnace to raise the temperature to 500°C and keep it warm for 30 minutes to form a molten flux liquid;

[0038] 2) Weigh the active material according to the above ratio and pour it into the molten flux solution in step 1), keep the temperature at 500°C and stir it fully, then stand still for 15 minutes, and then cool naturally to form a flux glass body;

[0039] 3) Cru...

Embodiment 3

[0042] An aluminum flux for aluminum alloy honeycomb plate brazing, made of 86.5% by mass percentage of binary flux matrix and 13.5% by mass of active material, said binary flux matrix is ​​KBe 2 f 5 -KAIF 4 , and the molar ratio of the two is KBe 2 f 5 :KAlF 4 =60:40; the active substance is KHF 2 .

[0043] The preparation method of the aluminum flux for aluminum alloy honeycomb plate brazing comprises the following steps:

[0044] 1) Weigh KBe according to the above ratio 2 f 5 and KAlF 4 Binary flux matrix, mixed evenly and placed in a platinum crucible, then placed the platinum crucible in a muffle furnace to raise the temperature to 490°C and keep it warm for 30 minutes to form a molten flux liquid;

[0045] 2) Weigh the active material according to the above ratio and pour it into the molten flux solution in step 1), keep the temperature at 490°C and stir it fully, then stand still for 13 minutes, and then cool naturally to form a flux glass body;

[0046] 3) ...

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Abstract

An aluminum flux for aluminum alloy honeycomb plate brazing and a preparation method thereof, which is made of a binary system flux matrix with a mass percentage of 83.5-89.5% and an active material with a mass percentage of 16.5-10.5%, the binary system Flux matrix is ​​KBe 2 f 5 -KAlF 4 , the active substance is KHF 2 or KHF 2 with SnF 2 the mix of. The brazing flux of the present invention does not contain noble metal salt CsF, the cost is low, its melting point is 435-450°C, and the brazing temperature is 450-480°C, which is lower than the existing AlF 3 ‑CsF aluminum flux has a melting point of about 30-50 °C, which can be applied to low-temperature brazing of aluminum alloy honeycomb panels, and the activation temperature matches the melting temperature of Zn‑Al solder to a high degree, realizing the application of Zn98Al solder in 3003 aluminum alloy The spreading on the surface, its spreading area is higher than that of the existing aluminum brazing flux, which improves the brazing performance of the aluminum alloy honeycomb panel.

Description

technical field [0001] The invention relates to a flux used for brazing aluminum alloys, in particular to an aluminum flux used for brazing aluminum alloy honeycomb plates and a preparation method thereof. Background technique [0002] Aluminum alloy honeycomb panels have the characteristics of low density, high rigidity and good stability, and have been widely used in aerospace, aircraft, trains, ships, construction and other fields. Traditional aluminum alloy honeycomb structures are generally bonded with organic colloids, and their performance is limited by the adhesive. The brazing of aluminum alloy honeycomb panels can form a metallurgical bond at the joint, and the performance of the joint is better than that of the adhesive joint. However, the brazability of aluminum alloys is much worse than that of steel, copper and copper alloys, because an extremely dense oxide film is easily formed on the surface of aluminum and its alloys. [0003] One of the functions of alum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/288B23K35/40
Inventor 张雷钟素娟秦建纠永涛沈元勋张亮王博黄森
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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