Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Patent
1989-09-06
1990-04-17
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
419 37, 419 54, 419 55, 419 57, 419 60, B22F 100
Patent
active
049178598
ABSTRACT:
The present invention provides a dewaxing process for metal powder compact which comprises the steps of embeding in alumina powder an injection-molded metal powder compact consisting of metal powder and an organic binder including low melting point substances; heating the embeded compact to a temperature of 200.degree. C. in a chemically inert atmosphere in a dewaxing furnace, thereby removing the low melting point substances from the compact without deformation of the compact; placing the compact in a closed sintering vessel so as to keep the surrounding temperature constant and disposing the vessel in a vacuum furnace; evacuating the vacuum furnace; and removing the organic binder by heating to a temperature of 550.degree. to 650.degree. C. at a heating rate of 300.degree. to 600.degree. C./hr while supplying an inert gas into the vacuum furnace. According to the dewaxing process, the organic binder can be removed at low cost and in a reduced processing time without causing problems, like blistering and cracking.
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Lechert Jr. Stephen J.
Mitsubishi Steel Mfg. Co. Ltd.
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