Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Heat and pressure simultaneously to effect sintering
Patent
1982-09-01
1984-05-15
Hunt, Brooks H.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Heat and pressure simultaneously to effect sintering
419 54, 419 55, B22F 314, B22F 316
Patent
active
044487479
ABSTRACT:
A high density sintering method for powder molded products by applying preliminary sintering to powder molded products previously molded into a predetermined shape and then applying hot isostatic press process to the sintered products thereby producing high density sintered product which includes the steps of loading the powder molded products into a movable heating furnace equipped with at least one heating means and having a heat insulating structure, introducing the heating furnace into an atmosphere chamber, applying preliminary sintering to the powder molded products in the heating furnace by the heating means while conditioning the inside of the atmosphere chamber to a vacuum or predetermined gas atmosphere, subsequently removing the heating furnace while maintaining the inside thereof at a high temperature from the atmosphere chamber and directly introducing the furnace into a high pressure vessel, thereafter, applying the hot isostatic press process to the sintered products in the furnace while charging a gas as a pressure medium under pressure into the high pressure vessel and elevating the temperature in the heating furnace by the heating means, thereby producing high density sintered products, and then removing the heating furnace together with the high density sintered products loaded therein out of the high pressure vessel after completion of the hot isostatic press process.
REFERENCES:
patent: 3622313 (1971-11-01), Havel
patent: 3772009 (1973-11-01), Isaksson
patent: 3893852 (1975-07-01), Bergman et al.
patent: 4032337 (1977-06-01), Boyer
patent: 4359336 (1982-11-01), Bowles
Fujikawa Takao
Miyanaga Junichi
Moritoki Masato
Hunt Brooks H.
Kabushiki Kaisha Kobe Seiko Sho
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