Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Patent
1993-07-02
1995-10-24
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
419 10, 419 12, 419 13, 419 14, 419 19, 419 23, 419 33, 419 38, 419 44, 419 57, B22F 100, B22F 316
Patent
active
054607752
ABSTRACT:
The invention provides aluminum sintered alloys with high dimensional accuracy and high density which are superior in mechanical and physical characteristics as well as wear resistance, and a method of producing such alloys not by plastic working but by atmospheric sintering with high economy. Rapidly solidified aluminum alloy powder resulting from solidifying aluminum alloy molten metal containing 0.4 to 4.0% by weight of Mg at a solidification rate of 10.sup.2 .degree. C./sec or more is press molded in the cold, after annealing in the temperature range of 250 to 450.degree. C. if necessary, and then the molded product is sintered by generating nitrogen compounds on the powder surface at atmospheric pressure with a nitrogen partial pressure of 0.8 atm or more and a steam partial pressure of 0.01 atm or less in which a reducing gas component has been added as a nitrogen-combining acceleration gas component by 0.01 atm or more. Thus, a nitrogen-combined aluminum sintered alloy containing 0.4 to 4.0% by weight and 0.2 to 4.0% by weight of nitrogen is obtained.
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Hayashi Tetsuya
Takeda Yoshinobu
Jenkins Daniel J.
Sumitomo Electric Industries Ltd.
Walsh Donald P.
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