What gas can a vacuum atmosphere furnace pass through?

A vacuum atmosphere furnace can introduce various gases to meet the needs of different material processing and experiments. Specifically, the gases commonly used in vacuum atmosphere furnaces include but are not limited to the following:
Nitrogen (N ₂): Nitrogen is an inert gas commonly used in vacuum atmosphere furnaces to protect the sintering process and prevent oxidation reactions of materials at high temperatures. It is suitable for sintering various materials, especially those sensitive to oxygen.
Argon (Ar): Argon is also an inert gas with excellent stability. In vacuum atmosphere furnaces, argon gas is also commonly used to protect the sintering process and prevent material oxidation. In addition, argon gas can also be used to improve the wettability of materials and promote material transport during the sintering process.
Oxygen (O ₂): In certain specific situations, oxygen can also be introduced into a vacuum atmosphere furnace. For example, when sintering transparent ferroelectric ceramics, an oxygen atmosphere helps to achieve better sintering results. However, it should be noted that oxygen is an active gas, and its concentration and flow rate need to be strictly controlled during use to avoid adverse effects on the material.
Hydrogen (H ₂): Hydrogen is mainly used for reducing sintering in vacuum atmosphere furnaces. It can react with oxides in materials to form metals or alloys. For example, when sintering transparent alumina ceramics, a hydrogen atmosphere helps to remove oxygen elements from the material and improve its purity. However, it should be noted that hydrogen gas is flammable and explosive, and special care should be taken when using it, and corresponding safety measures should be taken.
Other inert gases: In addition to nitrogen and argon, vacuum atmosphere furnaces can also introduce other inert gases, such as neon (Ne), helium (He), etc. These gases also have excellent stability and can be used to protect the sintering process or improve the performance of materials.
Mixed gas: In some cases, in order to achieve better sintering results or meet specific process requirements, a vacuum atmosphere furnace can also introduce mixed gas. The types and proportions of mixed gases need to be determined based on specific experimental or production needs.
It should be noted that when selecting the gas to be introduced into the vacuum atmosphere furnace, factors such as material properties, sintering process requirements, and gas characteristics need to be fully considered. At the same time, it is necessary to strictly control parameters such as gas flow rate, concentration, and purity during use to ensure the stability and safety of the sintering process.
In addition, the furnace structure and atmosphere control system of a vacuum atmosphere furnace are also important factors affecting gas selection and usage efficiency. The furnace body needs to have good sealing and high-temperature resistance to ensure stable vacuum and atmosphere environment can be maintained during the sintering process. The atmosphere control system needs to have precise control capabilities and safety protection functions to ensure accurate gas supply and smooth sintering process.