Patents Represented by Attorney Johnson Ervin F.

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  • Metal matrix composite piston head and method of fabrication
    Patent number: 4706550
    Abstract: An aluminum torpedo piston is provided with a piston head fabricated from a etal matrix composite material composed of aluminum and silicon carbide fibers that are integrally joined by an inertial welding technique. A 23% weight of silicon carbide fibers to powdered aluminum was selected. Resistance to intense heating which would otherwise cause melting and erosion of the piston is avoided to permit longer, high speed runs.
    Type: Grant
    Filed: January 9, 1986
    Date of Patent: November 17, 1987
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: David M. Bullat