Sol-gel prepared Ni-alumina composite materials |
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Authors: | E Breval Z Deng S Chiou C G Pantano |
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Affiliation: | (1) Materials Research Laboratory, The Pennsylvania State University, PA16802 University Park, USA;(2) Department of Materials Science and Engineering, The Pennsylvania State University, PA16802 University Park, USA;(3) Department of Engineering Science and Mechanics, The Pennsylvania State University, PA16802 University Park, USA |
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Abstract: | The sol-gel method has been utilized for the preparation of dense, homogeneous ceramic-metal composites with up to 50% Ni in Al2O2. Examination by SEM and TEM shows that the materials consist of micrometre-size Al2O3 with metallic Ni in isolated regions from 50 m down to nanometre size. The density ranges from 97% (10% Ni) to 74% (50% Ni) of the theoretical number. The hardness decreases from 18 GPa for pure alumina to 10 GPa for alumina containing 50% Ni. The fracture toughness increases significantly from K
1c=3–4 MPa m1/2 to K
1c= 8.5 MPa m1/2. The elastic and shear moduli decrease from E= 400 GPa and G= 160 GPa for pure alumina to E= 320 GPa and G= 135 GPa when containing 50% Ni. The electrical resistivity is 106 m with 10 to 40% Ni but decreases drastically at 50% Ni content. |
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