Introduction to relevant knowledge of vacuum brazing furnace

2021-11

The heat-resistant materials of vacuum brazing furnaces are mainly used as heating elements, so what are the heat-resistant materials of vacuum brazing furnaces? In fact, with the continuous development of science and technology, the application of polymer based composite materials is becoming increasingly widespread, and different application fields have put forward higher requirements for different materials.
In industries such as vacuum brazing furnaces, the performance of materials is becoming increasingly high. In order to meet the requirements of these fields, researchers have developed many high-performance polymer materials, including heat-resistant materials for vacuum brazing furnaces. There are mainly several types of heat-resistant materials used in vacuum brazing furnaces. Among these heat-resistant materials, which one is better for vacuum brazing furnaces?
1. Thermosetting gum
Thermosetting resins include phenolic resin, polyimide, epoxy resin, silicone resin, etc. These materials are not thermoplastic, so they can be used for a long time at a higher temperature. Among the heat-resistant materials used in vacuum brazing furnaces, this material is the only one. Generally speaking, epoxy resin can be used at temperatures above 200 ℃, while other materials can be used for a long time at temperatures above 300 ℃, especially phenolic resin. It is a high-temperature and ablation resistant material widely used in space shuttles.
2. Special engineering plastics
This material has a high melting point, high thermal decomposition temperature, high strength and stiffness. However, because these materials are thermoplastic, the temperature used cannot exceed their melting point. Therefore, if used for a long time, the temperature cannot exceed 300 degrees Celsius.
3. Other materials
The United States has developed a resin called polyarylacetylene, which can be used for a long time between -100~500 ℃ without significant changes in performance. Its glass transition temperature is 316.3 ℃, initial thermal decomposition temperature is 503 ℃, thermal decomposition temperature is 663 ℃, and residual carbon rate is 84 at 900 ℃. It is a very good high-temperature resistant material.

What to do if there is air leakage in the vacuum brazing furnace?

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What to do if there is air leakage in the vacuum brazing furnace?

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