Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing since 1989

-----

Why in PVD need vacuum pressure?

Why in PVD process required the low atmospheric pressure (i.e., vacuum air chamber)?

Alan
student - Kuala Lumpur, Malaysia
2006

Hi,

In certain PVD process, one does not want the interfering effects of certain gases like oxygen and hydrogen. in some processes in fact after obtaining vacuum, a steady stream of inert gas like, argon, helium is let in. This inert gas will not only flush out the residual gas but also aids in pushing the reactants (if in vapour form) towards each other. Secondly, low pressure may be a thermodynamic requirement of the reaction.

Sonali Kokane
- Mumbai, Maharashtra, India
2006

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: