Sintering and Characteristics of Electroconductive Al2O3-Based Composites
Al2O3-based composites with the addition of 30 vol% of TiN, TiC, TiB2 have been produced by hot pressing and by gas-pressure sintering. Mechanical, electrical and thermal properties have been correlated to the microstructure and to the composition. Mechanical properties of the hot pressed samples reveal an increase in fracture toughness of 30–70% and in flexural strength of ~ 70%, in comparison with the Al2O3 matrix. Electroconductive (ρ~10−3 −10−5 Ω.cm), toughened and reinforced composites useful for manufacturing complex shapes by electrical discharge machining have been produced, with the addition of secondary phases in an amount greater than 20−30 vol%.
Unable to display preview. Download preview PDF.
- 1.Bellosi, A., Graziani, T., Guicciardi, S. and Tampieri, A., Characteristics of TiB2 Ceramics. Special Ceramics 9, London 18-20 Dec. 1990, in print on the Proceeding.Google Scholar
- 2.McMurtry, C.H., Boecker, W.D.G., Seshadri, S., Zanghi, J.S. and Garnier, J.E., Microstructure and Material Properties of SiC-TiB2 Particulate Composites. Am. Ceram. Soc. Bull., 1987, 60, 325.Google Scholar
- 3.Bellosi, A., Guicciardi, S. and Tampieri, A., Development and characterization of electroconductive Si3N4-TiN composites. In print on J. Europ. Ceram. Soc..Google Scholar
- 6.Tampieri, A., Biasini, V. and Bellosi, A., Oxidation of monolithic TiB2 and of Al2O3-TiB2 Composites. European Ceramic Society Second Conference, Augsburg, Sep. 11-14, 1991.Google Scholar