Abstract A process for impregnating a mass of carbon particles with metal, preferably an aluminum alloy, to form a solid billet suitable for machining therefrom articles having advantageous durability and lubricity characteristics, particularly as apex seals for Wankel engines. A mass of carbon particles is heated to a temperature at or above the melting point of the metal in a closed crucible of permeable refractory material such as porous carbon, and the molten metal is poured over the porous crucible into a second crucible wherein the porous crucible becomes enveloped by the molten metal but the molten metal does not penetrate the porous crucible. The atmosphere surrounding the molten metal and porous crucible is then pressurized to force the molten metal through the porous crucible and thus cause controlled impregnation of the mass of particles.
AN ALUMINUM CARBON COMPOSITE SEAL MATERIAL COMPRISING BETWEEN 35 AND 45 PERCENT CARBON BY WEIGHT WITH THE BALANCE CARBIDE REACTION PRODUCTS AND AN ALIMINUM-SILICON ALLOY IN TURN COMPRISINF 14 TO 19 PERCENT SILICON 2 TO 5 PERCENT COPPER OR NICKEL 0 TO 1 PERCENT MAGNESIUM TITANIUM OR IRON BALANCE ALUMINUM SAID SEAL MATERIAL HAVING THE FOLLOWING PHYSICAL CHARACTERISTICS,
Claim 2
Dependent Claim
58 words
AN ALUMINUM CARBON COMPOSITE SEAL MATERIAL COMPRISING BETWEEN 35 AND 45 PERCENT CARBON BY WEIGHT WITH THE BALANCE CARBIDE REACTION PRODUCTS AND AN ALIMINUM-SILICON ALLOY IN TURN COMPRISINF 14 TO 19 PERCENT SILICON 2 TO 5 PERCENT COPPER OR NICKEL 0 TO 1 PERCENT MAGNESIUM TITANIUM OR IRON BALANCE ALUMINUM SAID SEAL MATERIAL HAVING THE FOLLOWING PHYSICAL CHARACTERISTICS,