Iron base sintered alloy having highly densified and...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 38/00 (2006.01) B22F 3/02 (2006.01) B22F 3/035 (2006.01) C22C 33/02 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2526886

An iron base sintered ally exhibiting high surface densification and high surface hardness, characterized in that it comprises a sintered alloy surface layer portion which has a thickness in the range of 1 µm to 2 mm from the surface thereof and contains K and/or Na in an average concentration of 0.0001 to 1 mass % or in that it comprises a sintered alloy surface layer portion which has an average P concentration being higher than that in the inner portion of the sintered alloy by 0.01 to 1 mass % and contains K and/or Na in an average concentration of 0.0001 to 1 mass %; and a method for the iron base sintered ally.

L'invention concerne un alliage fritté à base de fer, présentant une densité superficielle et une dureté superficielle élevées. Cet alliage est caractérisé en ce qu'il comprend une couche superficielle d'alliage fritté, qui présente une épaisseur comprise entre 1 µm et 2 mm, à partir de la surface, et qui contient du K et/ou Na dans une concentration moyenne de 0,0001 à 1 % en poids, ou est caractérisé en ce qu'il comprend une couche superficielle d'alliage fritté, qui présente une concentration moyenne de P supérieure à celle de la couche intérieure dudit alliage de 0,01 à 1 % en poids, et qui contient du K et/ou Na dans une concentration moyenne de 0,0001 à 1 % en poids. L'invention concerne également un procédé de production dudit alliage fritté à base de fer.

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