Metal composite material and process for producing metal composite material

A process for producing a metal composite material, comprising the steps of:

• a mixing step of mixing together porous aluminum borate particles, a silica sol containing negatively charged silica particles and an alumina sol containing positively charged alumina particles in water to obtain an aqueous mixture slurry,
• a dewatering step of removing water from the aqueous mixture slurry to form a preliminary mixture body,
• a sintering step of sintering the preliminary mixture body at a predetermined temperature to form a preform,
• a melt impregnation step of impregnating the preform with a molten metal by pressure casting, and
• a grinding step of grinding an outer surface of the impregnated preform after the metal has been bound thereto.

A process for producing a metal composite material, comprising the steps of:

• a mixing step of mixing together porous aluminum borate particles, a cationic electrolyte solution containing a positively charged electrolyte and a silica sol containing negatively charged silica particles having a particle diameter in the range of 40 to 200 nm in water to obtain an aqueous mixture liquid,
• a dewatering step of removing water from the aqueous mixture liquid to form a preliminary mixture body,
• a sintering step of sintering the preliminary mixture body at a predetermined temperature to form a preform,
• a melt impregnation step of impregnating the preform with a molten metal by pressure casting, and
• a grinding step of grinding an outer surface of the impregnated preform after the metal has been bound thereto.