Process and apparatus for removing combustible lubricants from s

Details Process and apparatus for removing combustible lubricants from s Process and apparatus for removing combustible lubricants from s

1983-01-11

1985-01-22

Padgett, Benjamin R.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Special medium during sintering

419 31, B22F 300

Patent

active

044951485

ABSTRACT:
Workpieces pressed from metallic particles, impregnated with an organic lubricant, are sintered in a muffle furnace after traversing a preheating chamber serving for the removal of the lubricant. A substantially oxygen-free protective gas, consisting at least in part of combustible constituents, is passed in counterflow to the workpieces through the preheating chamber in which it is mixed with a hot oxygen-rich gas, preferably air, admitted into the chamber at locations spaced apart in the transport direction of the workpieces to burn the combustible components of the protective gas along with the evaporating lubricant; the oxygen content decreases progressively from a relatively high value near the entrance end of the preheating chamber, where the workpieces are protected from oxidation by their low initial temperature, toward the exit end. The entering air may be brought to a high temperature by heat exchange with the hot gas mixture leaving the chamber at its entrance end.

REFERENCES:
patent: 3230596 (1966-01-01), Batigne et al.
patent: 3326676 (1967-06-01), Rubel et al.
patent: 3346417 (1967-10-01), Ehrlich
patent: 3971632 (1976-07-01), Menrad et al.
patent: 4104061 (1978-08-01), Roberts
patent: 4396434 (1983-08-01), Forster

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