Aluminum alloy honeycomb panels have the characteristics of low density, high stiffness, and good stability, and have been widely used in aerospace, aircraft, trains, ships, construction, and other fields. Organic colloidal bonding is widely used in traditional aluminum alloy honeycomb structures, but its performance is limited by the adhesive. However, aluminum alloy honeycomb panel brazing can form metallurgical bonds at the joints, with joint performance superior to adhesive joints. Nevertheless, the weldability of aluminum alloys is much poorer than that of steel, copper, and copper alloys because the surface of aluminum and its alloys easily forms a very dense oxide film. One of the functions of aluminum flux is to remove the dense oxide film on the surface of aluminum alloys. For aluminum alloy brazing, the recognized non-corrosive flux is alf3-csf binary flux. However, the active temperature of the existing alf3-csf binary flux is 480 ~ 500, while the melting point of zn98al flux is 380 ~ 415, meaning that the active temperature of the flux is higher than its melting temperature, and thus the flux has not yet activated, resulting in a low compatibility between them and leading to poor flux activity. Additionally, the high content of csf in alf3-csf binary flux, which is a precious metal salt with high cost, results in high costs for aluminum alloy honeycomb panel brazing and limits its application promotion. In light of these issues, there is an urgent need to develop a low melting point, low cost flux that has a high compatibility with zinc-aluminum brazing.Aluminum brazing agent.

To overcome the shortcomings of existing technology, technicians have provided an aluminum brazing material for aluminum alloy honeycomb panels and its preparation method. It is implemented through the following technical scheme: an aluminum brazing agent for brazing aluminum alloy honeycomb panels is made from 83.5-89.5% by mass of a binary flux matrix and 16.5-10.5% by mass of active substances. The active substances also contain snf2 and khf2 with a mass percentage of 5-8%, and snf2 with a mass percentage of 2.5-11.5%.

The preparation method for this aluminum brazing agent for aluminum alloy honeycomb panels includes the following steps: first, weigh kbe2f5 and kalf4 binary flux matrix in proportion, mix evenly, heat to 470-510 degrees Celsius, maintain for half an hour to form molten brazing liquid; secondly, weigh the active substances according to the above ratio and pour them into the molten solder liquid from the previous step while maintaining a temperature of 480-500 and stirring thoroughly; then let it sit for 10-15 minutes before naturally cooling to form solder glass; finally, crush, grind, and sieve the obtained solder glass into a powder with a mesh size of 100-200 to obtain the product.Aluminum brazing agentCompared with existing technology, this aluminum brazing agent has the following beneficial effects: 1. The melting point of this aluminum brazing agent is 435-450 degrees Celsius with a brazing temperature of 450-480 degrees Celsius, which is about 30-50 degrees lower than that of existing alf3-csf aluminum brazing agents; it can be applied to low-temperature brazing of aluminum alloy honeycomb panels; 2. This aluminum brazing agent does not contain precious metal salt csf, resulting in lower costs; 3. By adding khf2 and snf2 as active components in the solder matrix, it reduces solder viscosity and improves solder activity; 4. The active temperature of this aluminum brazing agent matches well with the melting temperature of zn-al solder; zn98al solder has a larger spread area on 3003 aluminum alloy than existing aluminum solders, improving the brazing performance of aluminum alloy honeycomb panels.

This gives it better market development potential.Aluminum brazing agent具有更好的市场发展潜力。