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Nanocrystalline; mullite; zirconia; aluminium; composites

Using nanocrystalline particles of mullite and zirconia respectively with diameters in the range 20–30 nm prepared by a sol-gel route, aluminium metal-matrix composites have been synthesized. A hot pressing technique has been used with temperatures varying from 450–610°C. The vickers hardness values for the composites are found to be substantially higher than that of pure aluminium. An order of magnitude increase in hardness is achieved when Al₅Mo phase is grown in the composite.

S K Pradhan¹ A Datta¹ A Chatterjee^{1 2} M De¹ D Chakravorty¹

1. Indian Association for the Cultivation of Science, Jadavpur, Calcutta - 700 032, India
2. Research and Consultancy Directorate, The Associated Cement Companies Ltd., Thane - 400 604, India

Published

November 1994