Optimized double press-double sinter powder metallurgy method

Details Optimized double press-double sinter powder metallurgy method Optimized double press-double sinter powder metallurgy method

1990-05-16

1992-01-14

Hunt, Brooks H.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75231, 75246, 419 11, 419 14, 419 38, 419 39, 419 53, 419 54, 419 55, 419 57, 419 58, B22F 100, B22F 300

Patent

active

050807129

ABSTRACT:
Methods for preparing sintered components from iron-containing and alloy steel powder are provided. The methods includes compacting a powder mixture in a die set at a pressure of at least about 25 tsi to produce a green compact which is then presintered at a temperature of about 1100.degree.-1600.degree. F. (593.degree.-870.degree. C.) for at least about 5 minutes to produce a presintered preform. The presintered preform is then compacted at a pressure of at least about 25 tsi to produce a double-pressed presintered preform, which is, in turn, sintered at a temperature of at least about 1000.degree. C. for at least about 5 minutes to produce a sintered component having improved transverse rupture strength and a higher density.

REFERENCES:
patent: 3704115 (1972-11-01), Wastenson et al.
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patent: 3901661 (1975-08-01), Kondo et al.
patent: 4042385 (1977-08-01), Miyake et al.
patent: 4253874 (1981-03-01), Cundill
patent: 4266974 (1981-05-01), Nitta et al.
"Handbook of Powder Metallurgy": I. A. White, Stainless Steel Powders--Manufacturing Techniques and Applications, pp. 90-115, New Types of Metal Powders, Gordon and Breach, New York (1964).
Metals Handbook, 9th Edition, vol. 7, "Powder Metallurgy", American Society for Metals, (1984), pp. 4, 25-39, 100-104, 683, 351-359 and 360-368.
Metals Handbook, 8th Edition, vol. 4, "Forming", American Society of Metals, (1969), pp. 454-459.
Hausner, Henry H., Handbook of Powder Metallurgy, "Effect of Double Pressing & Sintering of the Properties of 304L Stainless Steel Powders", (by White, 1960), 1973, p. 299.

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