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CFC, Graphite, or Moly, which is the best choice for vacuum ovens?
The answer is complex in that it depends on a number of things as follows: The materials being placed in or on the basket or fixture. The material the hearth is made of and the hearth design. The operating temperature of the process. Load weight of the materials to be placed in the basket or on theRead more
The answer is complex in that it depends on a number of things as follows:
Graphite is easy to work with and relatively inexpensive.
Molybdenum is difficult to work with and is expensive
CFC is strong but expensive and not as easy as graphite to repair
See lessWhat is the purpose of the oil diffusion pump in a vacuum system?
The purpose of the oil diffusion pump is to provide a lower pressure (higher vacuum) in the system being evacuated.
The purpose of the oil diffusion pump is to provide a lower pressure (higher vacuum) in the system being evacuated.
See lessDo all diffusion pumps have heaters?
I believe all true diffusion pumps have heaters.
I believe all true diffusion pumps have heaters.
See lessWhat are the causes of diffusion pump backstreaming?
High cross-over pressures when transitioning from mechanical pumps to diffusion. Contaminated diffusion pump oil. Poor performance of the holding pump causing high pressures in the diffusion pump. Leaks in the diffusion pump and/or holding pump and associated piping. Poor performance of the backingRead more
High cross-over pressures when transitioning from mechanical pumps to diffusion.
Contaminated diffusion pump oil.
Poor performance of the holding pump causing high pressures in the diffusion pump.
Leaks in the diffusion pump and/or holding pump and associated piping.
Poor performance of the backing pumps causing high pressures
Improper sequencing of the valving
See lessWhat is an acceptable vacuum furnace leak rate?
Typical acceptable vacuum furnace leak rate varies with the application of the furnace or the operations to be performed and/or the materials to be heated. A typical size new furnace would be less than 10 microns per hour for a mechanically pumped furnace. A diffusion pumped pumped furnace mightRead more
Typical acceptable vacuum furnace leak rate varies with the application of the furnace or the operations to be performed and/or the materials to be heated. A typical size new furnace would be less than 10 microns per hour for a mechanically pumped furnace. A diffusion pumped pumped furnace might be less than 5 microns per hour. These rates are for clean, dry and out-gassed conditions.
See less