Tech Team · Kintek Solution

During the sintering process, various types of atmospheres are used to control the environment around the powdered metal.

This influences the properties of the final sintered product.

These atmospheres include reducing atmospheres, vacuum, hydrogen, and inert gases like nitrogen and argon.

Reducing Atmospheres

Reducing atmospheres are used to prevent the burning of the briquettes and to reduce surface oxides.

Common gases used in reducing atmospheres include gas or ammonia decomposition for iron and copper-based products.

These atmospheres help in maintaining the desired carbon content and removing any surface oxides.

This is crucial for the integrity and strength of the sintered parts.

Vacuum Sintering

Vacuum sintering involves removing all gases from the furnace environment.

This method is particularly useful for reactive or refractory metals like beryllium, titanium, zirconium, tantalum, and alloys containing TiC or stainless steels.

Vacuum sintering prevents oxidation and allows for precise control over the sintering environment.

This is essential for materials that are highly reactive with oxygen.

Hydrogen Atmosphere

Hydrogen is often used in sintering processes, especially for materials like cemented carbide and stainless steel.

It acts as a reducing agent, helping to maintain the desired chemical composition and to remove any oxides that might have formed on the surface of the metal powder.

Hydrogen atmospheres are also effective in maintaining the mechanical properties of the sintered parts.

Inert Gases (Nitrogen and Argon)

Inert gases like nitrogen and argon are used to create an inert environment, preventing any chemical reactions that could alter the composition of the sintered material.

They are particularly useful for sintering stainless steels and other materials that require a stable, oxygen-free environment.

Nitrogen and argon can also be mixed with hydrogen to create a more controlled atmosphere, depending on the specific requirements of the sintering process.

Each of these atmospheres serves a specific purpose and is chosen based on the material being sintered and the desired properties of the final product.

The choice of atmosphere is critical as it directly impacts the porosity, density, strength, and hardness of the sintered body.

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