Metal and/or ceramic/graphite-containing aluminum composite material and method for producing metal and/or ceramic/graphite-containing aluminum composite material

A method for producing a metal and/or ceramic/graphite-containing aluminum composite, the method comprising:

• a molding step of forming a molded body by adding a silica-based inorganic binder within a range of 0.5 to 5 parts by volume in terms of SiO2 to 100 parts by volume of a mixed powder of raw materials prepared in such a way that the total of 40 to 80% by volume of a graphite powder comprising a natural graphite powder or a synthetic graphite powder each having a crystal structure that is not amorphous, 6 to 45% by volume in total of a metal powder and/or a ceramic powder, and 13 to 50% by volume of voids in the molded body after molding is 100% by volume, forming a molded material with the resulting material, and solidifying the molded material by heating at a temperature of 100° C. to 1,100° C. to prepare the molded body having voids to be used for composite formation;
• and
• a composite forming step of impregnating the voids of the molded body with a molten aluminum metal or a molten aluminum alloy at a pressure of 20 to 200 MPa or injecting a molten aluminum metal or a molten aluminum alloy into the voids of the molded body at a pressure of 20 to 200 MPa, thereby forming a composite, wherein
• a composite having a flexural strength of 90 MPa or higher, a thermal conductivity of 240 W/m·K or higher in either the XY direction or the Z direction, a coefficient of thermal expansion of 6.0 ppm/K or lower in ether of the XY direction or the Z direction is produced.