Search Results

Metal matrix composite (MMC) engine components for high performance racing applications were produced using the PRIMEX™ pressureless metal infiltration process. Utilization of these composites resulted in significant weight reduction and performance benefits for each component. The metal matrix composites which were evaluated consisted of aluminum alloys reinforced with 45-65 volume percent of either aluminum oxide or silicon carbide particulates. The high volume fraction of reinforcing particles resulted in significant increases in yield strength, stiffness, and wear resistance, while a significant decrease in the coefficient of thermal expansion was achieved as compared with unreinforced aluminum alloys. The tested metal matrix composite components included valve spring retainers, fuel pump pushrods, and transmission brake valves.