Vapor pressure.(TECH NOTES)(proper usage of vacuum furnaces)(Report)

Advanced Materials & Processes,  July, 2007  by Jones, William R.

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The Tech Note in the March 2007 issue was based on information from the ASM Handbook Volume 4 Heat Treating, in the Vacuum Furnaces section. However, since that book was published, several improvements in operating a vacuum furnace in partial pressure have been made. Specifically, backfill and the operating pressure level needed to prevent or minimize evaporation of the substrate have changed.

[GRAPHIC OMITTED] Static backfill: In the industry, backfill means filling the vacuum furnace back to some specific pressure with an inert gas, usually near atmospheric pressure or above. ...

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