Microstructure and Mechanical Properties of Alumina-copper Composites
Alumina-copper composites were prepared by spontaneous infiltration of a molten copper-oxygen alloy into porous alumina preforms. Alumina preforms were prepared by partial sintering of powder compacts. A copper-7.0 atomic percent oxygen alloy was infiltrated into the preforms by heating to 1350°C under an inert atmosphere. The oxygen content of the copper phase in the composites was subsequently adjusted by heat treatment in controlled partial pressures of oxygen with target oxygen contents in the copper of 0.1, 1.7, 3.5, and 7.0 atomic percent. The strength and toughness of alumina-copper composites were measured as a function of the oxygen content in the copper to determine the effect of interfacial adhesion on mechanical properties. Strength and toughness did not vary significantly with oxygen content. Average strength was between 400 and 500 MPa and toughness was between 9 and 11 MPa·m1/2.
S. Menon and W. Fahrenholtz, "Microstructure and Mechanical Properties of Alumina-copper Composites," Ceramic Transactions, John Wiley & Sons, Sep 2003.
Materials Science and Engineering
Keywords and Phrases
Alumina; Alumina-Copper Composites; Metallic Matrix Composites; Copper; Microstructure
Book - Chapter
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