What gases can be used in an atmosphere muffle furnace?

There are various types of gases that can be introduced into the atmosphere muffle furnace, depending on the design of the equipment and experimental requirements. Generally speaking, the gases that can be introduced into an atmosphere muffle furnace include but are not limited to the following:

Inert gas:
Nitrogen (N ₂): Nitrogen has good purity and stability, and is often used as a protective atmosphere to prevent metal oxidation and corrosion at high temperatures.
Argon (Ar): Argon is also a commonly used inert gas that can be used for high-temperature treatments such as heat treatment, melting, and quenching to prevent material oxidation.
Helium (He): Although helium is relatively valuable, due to its minimal chemical reactions, it can be used for laboratory level research to avoid oxidation reactions.
Reductive gas:
Hydrogen (H ₂): Hydrogen is a highly reactive gas that is typically not used alone. But in specific situations, such as during annealing, adding an appropriate amount of hydrogen can reduce material oxidation and decarburization, and improve product quality.
Ammonia decomposition gas: Ammonia decomposition gas contains hydrogen and nitrogen, and also has certain reducibility, which can be used in certain specific heat treatment processes.
Other gases:
Oxygen (O ₂): In some special cases, the atmosphere muffle furnace may also require oxygen to be introduced to meet specific experimental or process requirements.
It should be noted that there may be differences in gas inlet for different models and specifications of atmosphere muffle furnaces. Therefore, when selecting and using an atmosphere muffle furnace, the types and conditions of gases that can be introduced should be determined based on specific experimental or process requirements, as well as the technical parameters and operating instructions of the equipment.

In addition, the following points should be noted when introducing gas:
Ensure that the gas pipeline is leak free and the gas purity meets the requirements.
Accurately control the flow rate and pressure of gas according to experimental or process requirements.
During the heating process, pay close attention to changes in the atmosphere and adjust the gas flow rate and composition in a timely manner.

By reasonable gas injection and control, the atmosphere muffle furnace can provide an ideal heat treatment environment for various materials and processes, meeting the needs of scientific research and production.