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Vacuum Heat Treatment Furnace

Vacuum Sintering Furnace

Vacuum Brazing Furnace

Advanced functional materials vacuum brazing applications

Advanced functional materials such as multiphase ceramics, fiber-reinforced ceramic matrix composites, and thermoelectric materials have properties such as high temperature resistance, thermal shock resistance, corrosion resistance, dielectric properties, and energy conversion properties. Therefore, they are widely used in the application of aerospace components. focus on. Among them, SiO2-BN, ZrC-SiC (ZS ceramics), ZrB2-SiC-C (ZSC ceramics), C/C composite materials, C/SiC composite materials, SiCf/SiC composite materials, SiO2f/SiO2 composite materials, Bi2Te3, Materials such as skutterudite (CoSb3) are the most typical, and their application areas include the production and manufacturing of important structural components such as engine thrust chamber nozzles, aircraft thermal protection layers, missile radomes, and thermoelectric conversion devices. However, the above-mentioned materials are often brittle and hard, which makes processing difficult. In order to save manufacturing costs, facilitate component assembly and large-scale device assembly, it is often necessary to achieve reliable connection with metal materials. Different from structural materials, in the connection of advanced functional materials, in addition to ensuring that the joint can meet the mechanical properties and service environment requirements, it is also necessary to keep the functionality of the base material or joint as unaffected as possible. Therefore, the base material will be damaged. The destructive fusion welding method cannot be used, and under the high-temperature service environment and the requirements for lightweight components, it is difficult to achieve reliable connections through adhesive bonding and mechanical connections. Although some scholars have used solid-phase connection methods such as diffusion welding to achieve connection, the joint strength is low and cannot meet the use requirements. Moreover, this method requires high pre-welding treatment of the connection surface, the joint assembly is complex, and the welding efficiency is low, making it difficult to implement in actual production. Promote use in China.

Applications of vacuum brazing

Vacuum brazing is a metallurgical bond formed by the interface reaction between the molten brazing filler metal and the base metal, thereby achieving effective connection of the joints. It has the advantages of flexible assembly and small impact on component size after welding, and is widely used in the connection of dissimilar materials.

However, the physical and chemical properties of the functional materials themselves are quite different from the metal materials that need to be connected. During the vacuum brazing process, there are often problems such as poor interface bonding strength, poor brazing seam structural properties, and high joint residual stress, resulting in low joint mechanical properties. It hinders 71% of the function of functional materials or entire components. Therefore, a large number of studies have been carried out from the perspectives of material composition design, interface structure control, base metal surface and joint structure optimization, etc., to realize the vacuum brazing connection of advanced functional materials and metals. Researching widely.