23.
    发明专利
    未知

    公开(公告)号:BRPI0519535A2

    公开(公告)日:2009-02-17

    申请号:BRPI0519535

    申请日:2005-12-16

    Abstract: Fine-grained (average grain size 1nm to 1,000nm) metallic coatings optionally containing solid particulates dispersed therein are disclosed. The fine-grained metallic materials are significantly harder and stronger than conventional coatings of the same chemical composition due to Hall-Petch strengthening and have low linear coefficients of thermal expansion (CTEs). The invention provides means for matching the CTE of the fine-grained metallic coating to the one of the substrate by adjusting the composition of the alloy and/or by varying the chemistry and volume fraction of particulates embedded in the coating. The fine-grained metallic coatings are particularly suited for strong and lightweight articles, precision molds, sporting goods, automotive parts and components exposed to thermal cycling. The low CTEs and the ability to match the CTEs of the fine-grained metallic coatings with the CTEs of the substrate minimize dimensional changes during thermal cycling and prevent premature failure.

    RECUBRIMIENTOS METALICOS DE GRANO FINO QUE TIENEN EL COEFICIENTE DE EXPANSION TERMICA IGUAL A AQUEL DEL SUSTRATO.

    公开(公告)号:MXPA06011664A

    公开(公告)日:2007-01-23

    申请号:MXPA06011664

    申请日:2005-12-16

    Abstract: Se describen los recubrimientos metalicos de grano fino (tamano de grano promedio de 1 nm hasta 1,000 nm) que contienen opcionalmente particulados solidos dispersados en estos. Los materiales metalicos de grano fino son significativamente mas duros y mas fuertes que los recubrimientos convencionales de la misma composicion quimica, debido al reforzamiento de may-Petch, y tienen bajos coeficientes lineales de expansion termica (CTEs). La invencion proporciona los medios para igualar el CTE del recubrimiento metalico de grano fino a uno del sustrato, a aquel del sustrato, mediante el ajuste de la composicion de la aleacion y/o, mediante la variacion de la quimica y la fraccion volumetrica de los particulados incrustados en el recubrimiento. Los recubrimientos metalicos de grano fino son particularmente adecuados para articulos fuertes y de peso ligero, moldes de precision, articulos deportivos, partes automovilisticas y componentes expuestos al ciclo termico. Los bajos CTEs y la habilidad para igualar los CTEs de los recubrimientos metalicos de grano fino con los CTEs del sustrato, reducen al minimo los cambios dimensionales durante el ciclo termico y previenen la falla prematura.

    27.
    发明专利
    未知

    公开(公告)号:ES2108965T5

    公开(公告)日:2003-09-16

    申请号:ES94900026

    申请日:1993-11-26

    Abstract: A process for producing nanocrystalline materials, and in particular nanocrystalline nickel having an average grain size of less than about 11 nanometers is described. The nanocrystalline material is electrodeposited onto the cathode in an aqueous acidic electrolytic cell by application of a pulsed D.C. current. The cell electrolyte also contains a stress reliever, such as saccharin, which helps to control the grain size. The novel product of the invention find utility as wear resistant coatings, hydrogen storage materials, magnetic materials and as catalysts for hydrogen evolution.

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