Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder shape or size characteristics
Patent
1981-11-05
1985-01-01
Padgett, Benjamin R.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder shape or size characteristics
428567, 428548, 419 27, B22F 326, B22F 700
Patent
active
044915586
ABSTRACT:
A precision molded article, such as a die cavity, is made by combining iron powder granules and optional manganese granules with a heat fugutive organic binder, molding the granule-binder mixture into a green molded preform, thermally degrading and removing essentially all the binder to form a skeletal preform, and infiltrating the preform with an infiltrant which has a lower melting point than the iron powder granules and which optionally contains manganese, with the proviso that either the above decribed manganese granules are employed or manganese-containing infiltrant is employed, thereby forming a molded article having a skeleton of ferroalloy granules having a martensitic or perlitic core and an outer layer of austenitic manganese steel, the skeleton being surrounded by infiltrant.
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Avery, "Austenitic Manganese Steel", ASM Metals Handbook, 8th Edition, vol. 1, p. 6 (1977).
Kornmann et al., "Manganese Diffusion Coating of Steels," Metals Technology, p. 218, (Apr. 1977).
Salak, "Sintered Manganese Steels, Parts I and II," Powder Metallurgy International, 12, 1 and 2 (1980).
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Brookes Anne
Cleveland David R.
Minnesota Mining and Manufacturing Company
Padgett Benjamin R.
Sell Donald M.
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