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 μm 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 ∼106ωm with 10 to 40% Ni but decreases drastically at 50% Ni content.
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Breval, E., Deng, Z., Chiou, S. et al. Sol-gel prepared Ni-alumina composite materials. J Mater Sci 27, 1464–1468 (1992). https://doi.org/10.1007/BF00542904
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DOI: https://doi.org/10.1007/BF00542904