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Vacuum Heat Treatment Furnace

Vacuum Sintering Furnace

Vacuum Brazing Furnace

Vacuum Brazing and its Applications

For ceramic materials, everyone’s first impression is definitely its high melting point, high insulation performance and poor thermal stability. In the process of welding assemblies using ceramics and metals as connecting materials, these characteristics often add great difficulty to traditional welding methods. The resulting welded joints have poor performance and cannot meet process requirements. The application of vacuum brazing in the field of connecting ceramics and metal materials can effectively solve this problem. It can organically combine ceramics and metals to obtain composite components that have the advantages of both ceramics and metals.

Currently, commonly used connection methods include the following categories: mechanical connection method, electrostatic connection method, hot isostatic pressing method, vacuum brazing method and solid-state diffusion connection method. However, during the production and scientific research process, scientific researchers comprehensively considered the joint performance, use cost, implementation difficulty and other factors of these connection methods and found that vacuum brazing is more suitable for connecting ceramics and metals than other connection methods. Other connection methods are available. Its obvious limitations prevent it from being widely and efficiently used in manufacturing.

Therefore, vacuum brazing is currently the most commonly used and most actively researched connection method for connecting ceramics and metals.

Al2O3 ceramics and 304 stainless steel are two common materials in our lives. Al2O3 ceramics are used in electronic components and substrates, high-temperature electrical insulators and other fields due to their high hardness and strong wear resistance.

A materials research institute conducted experimental research on vacuum brazing of 304 stainless steel parts and metallized alumina ceramics. They first prepared a metallized ceramic surface, and applied molybdenum and manganese slurry on the ceramic surface to be metalized by screen printing and coating. Then, they performed metallization and infiltration at 1500°C, and repeated the second molybdenum coating. Manganese slurry, burning and infiltration, then electroplating nickel metal film, hydrogen sintering at 1200℃; then preparing the stainless steel brazing surface, that is, plating a layer of nickel on the surface to be welded.

Vacuum brazing process: AgCu28Ni1.5 alloy powder is used as the brazing material, the brazing temperature is 830°C, and the heat preservation is 15 minutes; the obtained brazed joint can meet the high temperature test of 500°C × 48h, and the sealing performance of the joint after the test meets the helium leakage rate <4×10^-4 Pa·m³/s.