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Abstract

Article produced in a mould for a plastics moulding tool having a mould surface defining the contours of the article, with the article comprising a body formed from a composition comprising a sinterable material having a sintering temperature which material, before sintering, is shapable into a desired shape and which during sintering forms a porous body having pores, the sinterable material being at least partially sintered in the mould, and also comprising a matrix having a lower melting point than the sintering temperature of the sinterable material, with the matrix comprising a matrix metal which is infiltrated in the porous body to substantially fill the pores. The article also comprises at least one metal tube having an outside surface and being disposed in the body to provide one or more cooling passages in the body, with the metal tube comprising a metal having a melting point which is higher than the sintering temperature of the sinterable material, with a portion of the external surface of the tube being partially removed by being dissolved in the matrix metal prior to soldification of the matrix metal to bond the matrix and the tube together. The sinterable material is dissolvable in the matrix metal in its molten state and this limits dissolution of the metal of the tube in the matrix so that the metal of the tube is only partially removed in an amount which is insignificant to effect operation of the tube. Also provided is a method for producing the article, in which the mould is filled with powder or grains of the sinterable material and the tube is embedded in this. Cooling passages may also be provided in the material of the mold in which the article is produced.

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First Claim