How much vacuum can you achieve? What is atm"&"osphere protection?

Having worked with graphitization furnaces for so many years, almost every customer who consults me asks: How much vacuum can your furnace achieve? The question itself isn't wrong, but truly knowledgeable users are more concer"&"ned with how to use it in ultra-high temperature processes.

Vacuum Capacity

Our graphitization furnace can achieve an ultimate vacuum of 1×10?² Pa (approximately 10?? Torr), sufficient to meet the degassing"&", impurity removal, and cryogenic processing requirements of most materials. The vacuum pump unit includes a combination of rotary vane pumps, Roots pumps, and diffusion pumps or molecular pumps.

Why Switch to Micro-Posi"&"tive Pressure at High Temperatures?

This is crucial! Graphite materials undergo sublimation at high temperatures (directly changing from a solid to a gaseous state). The higher the temperature and the higher the vacuum, the faster the sublimation"&" rate.

How does the micro-positive pressure protection work?

During the high-temperature stage, high-purity argon gas is introduced to maintain the furnace pressure at approximately 1000 Pa in a micro-positive pressure state. This pressure is "&"sufficient to effectively inhibit graphite sublimation while isolating oxygen to prevent oxidation.

The most practical approach

Use vacuum during the low-temperature stage and switch to micro-positive pressure during the high-temperature stage. Maintain vacuum until the temperature reaches approximately 1500℃ to remove volatile substances. Then turn off the vacuum pump"&", introduce high-purity argon gas, switch to micro-positive pressure protection mode, and continue heating to the target temperature. Our control system supports automatic switching during the process, with one-button start-up, requiring no manual interve"&"ntion.