A hydrogen bell type annealing furnace is a specialized heating device that uses hydrogen or a hydrogen-nitrogen mixture as a protective atmosphere.
This furnace is designed to perform various heat treatments such as reducing, sintering, annealing, and surface treatment of materials like hard alloys, ceramic materials, magnetic materials, and rare refractory metals.
5 Key Points Explained
1. Types and Structure
The furnace comes in two main types: vertical and horizontal.
Both types use molybdenum wire as the heating element due to its high melting point (2630°C), ensuring durability and efficiency.
The furnace shell is made of metal to maintain air tightness, and molybdenum boats are commonly used for continuous production.
2. Functionality
The primary use of this furnace is for annealing, which involves heating a material to a specific temperature and then cooling it slowly to relieve internal stresses and improve ductility and toughness.
In a hydrogen atmosphere, the process is more efficient due to hydrogen's higher heat transfer coefficient compared to air or traditional hydrogen-nitrogen mixtures.
This makes the furnace particularly effective for treating cast and welded components, especially in steel parts.
3. Safety and Control
Operation of the hydrogen furnace requires strict attention to safety, particularly to prevent leaks that could lead to high-temperature hydrogen combustion.
The furnace features automatic and manual control systems, with a maximum temperature of 1600°C and precise temperature control within ±1°C.
The temperature uniformity can be adjusted between ±3°C to ±10°C depending on user requirements, ensuring the process meets specific heat treatment needs.
4. Applications
Beyond annealing, the hydrogen furnace is also used for sintering, metallization, brazing, and sealing of glass to metal parts.
It is versatile in its applications, supporting processes in ceramic sintering, powder metallurgy, and semiconductor alloying.
5. Microstructural Changes
During the annealing process in a hydrogen atmosphere, the material undergoes three key microstructural changes: recovery, recrystallization, and grain growth.
These changes help in improving the material's properties, making it more suitable for specific applications.
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