Abstract
Sol-gel techniques have been used to make mm-size pieces of Ni-alumina gels for abrasive use. The microstructure was studied extensively by electron microscopy methods and by electron and x-ray diffraction. The hardness, stiffness, and toughness were measured by indentation methods. Seeding of the gel with small additions of nm-size α-Al 2O 3 grains resulted in enhanced α-Al 2O 3 crystallization, a denser structure and better mechanical properties. The best Ni-alumina gel specimens had hardnesses and stiffnesses comparable to successful abrasive products and even better fracture toughnesses.
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