Metal porous preform and manufacturing process for metal composite member using the same

Abstract

Provided are a Fe-based metal porous preform capable of ensuring sufficient adhesiveness between a molten metal and a base material thereof even when a casting process having a time lag from completion of pouring of the molten metal till pressure impregnation is applied; and a manufacturing process for a metal composite member using such a preform. The Fe-based metal porous preform is a metal porous preform adopted in a casting process having a prescribed time lag from completion of pouring of a molten metal till impregnation of the molten metal when the metal porous preform set inside a mold is impregnated with the molten metal, and characterized by that the metal porous preform is made from an iron-based metal as a base, including chromium in the range of 10 to 40 wt % as a content.

What is claimed is:  
     
         1 . A metal porous preform adopted in a casting process having a prescribed time lag from completion of pouring of a molten metal till impregnation of the molten metal when the metal porous preform set inside a mold is impregnated with the molten metal, wherein the metal porous preform is made from iron or an iron-based metal as a base material, including chromium.  
     
     
         2 . The metal porous preform according to    claim 1   , wherein a chromium content is in the range of 10 to 40 wt %.  
     
     
         3 . A manufacturing process for a metal composite member including a casting process having a prescribed time lag from completion of pouring of a molten metal till impregnation of the molten metal when a metal porous preform set inside a mold is impregnated with the molten metal, comprising the steps of: 
 forming the metal porous preform, made from iron or an iron-based metal as a base material, and including chromium;    setting the metal porous preform inside a mold at a prescribed position; and    thereafter, pouring the molten metal into the mold to impregnate the metal porous preform with the molten metal under pressure,    whereby a composite section is formed in which a casting material and the preform are included.    
     
     
         4 . The manufacturing process for a metal composite member according to    claim 3   , wherein pores in the preform are filled with the molten metal by pressurizing the molten metal in the mold with a gas pressure after pouring of the molten metal is completed and a sprue of the mold is closed, in the casting process.  
     
     
         5 . The manufacturing process for a metal composite member according to    claim 3   , wherein the metal porous preform is manufactured by means of a sintering process.  
     
     
         6 . The manufacturing process for a metal composite member according to    claim 3   , wherein addition of chromium is performed by means of a chromizing treatment.