Improved powder metallurgy lubricant compositions and...

B - Operations – Transporting – 22 – F

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B22F 1/00 (2006.01) C08K 3/08 (2006.01) C10M 107/34 (2006.01)

Patent

CA 2474253

The present invention relates to improved metallurgical powder compositions that incorporate solid lubricants, methods for preparing and using the same, and methods of making compacted parts. Ejection properties, such as stripping pressure and sliding pressure, of compacted parts can be improved by using the solid lubricants. The solid lubricants contain polyalkylene- polyalkylene oxide block copolymer lubricants or a combination of polyalkylene-polyalkylene oxide block copolymer lubricants and at least one additional lubricant. The polyalkylene-polyalkylene oxide block copolymer lubricants include at least one block A of a linear or branched polyalkylene chain having from about 5 to about 500 carbon atoms, and at least one block B of an alkylene oxide chain having a formula -[O (CH2) r]m- , or -[(CH2)rO]m - . The polyalkylene block copolymer lubricants can have a formula represented as A-B or A-B-A.

La présente invention concerne des compositions de poudres métallurgiques améliorées qui comprennent des lubrifiants solides, des procédés de préparation et d'utilisation de ces compositions, ainsi que des procédés de production de pièces compactées. Les caractéristiques d'éjection, telles que la pression de démoulage et la pression de coulissement de pièces compactées, peuvent être améliorées grâce à l'utilisation de lubrifiants solides. Les lubrifiants solides contiennent des lubrifiants copolymères séquencés polyalkylène-oxyde de polyalkylène ou bien une combinaison de lubrifiants copolymères séquencés polyalkylène-oxyde de polyalkylène et au moins un lubrifiant additionnel. Les lubrifiants copolymères séquencés polyalkylène-oxyde de polyalkylène comprennent au moins une séquence A d'une chaîne polyalkylène linéaire ou ramifiée comportant d'environ 5 à environ 500 atomes de carbone, et au moins une séquence B d'une chaîne oxyde d'alkylène correspondant à la formule -[O(CH¿2?)¿r?]¿m?-, ou -[(CH¿2?)¿r?O]¿m?-. Les lubrifiants copolymères séquencés de polyalkylène peuvent correspondre à la formule A-B ou A-B-A.

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