An Oxidation Resistant Al2O3-TiO2 Sintered Silicon Nitride
Silicon nitride has been hot-pressed and pressureless sintered using densification aids based on the Al2O3-SiO2-TiO2 system. Hot-pressing can be achieved satisfactorily at 1700 °C with an Al2O3-TiO2 ratio of 1:1; sintering at 1850 °C requires liquid phase compositions richer in Al2O3 and giving a transient ternary liquid at temperatures in the region of 1500 °C. Dense materials prepared in this system show good resistance to oxidation at temperatures up to 1500 °C.
Unable to display preview. Download preview PDF.
- 1.Jack, K.H., The significance of structure and phase equilibria in the development of silicon nitride and sialon ceramics. In Science of Ceramics, ed. R Carlsson and S. Karlsson, Swedish Ceramic Society, 1981, 11, 125–42.Google Scholar
- 4.Billy, M. and Desmaison, J.G., High temperature oxidation of silicon-based ceramics, High Temperature Tech., 4, (3) 1986, 131–139.Google Scholar
- 5.Lamkin, M.A., and Riley, F.L., Oxygen diffusion in silicon dioxide and silicates: A Review, to be published.Google Scholar
- 6.Andrews, P. and Riley, F.L., The microstructure and composition of oxide films formed during high temperature oxidation of a sintered silicon nitride, J. Europ. Ceram. Soc., 5, 1989, 245–256.Google Scholar
- 8.DeVries, R.C., Roy, R and E.F. Osborn, The System TiO2-SiO2, Trans. Brit. Ceram. Soc., 53  1954, 524–540.Google Scholar
- 9.Agamawi, Y.N. and White, J., The system Al2O3-SiO2-TiO2, Trans. Brit. Ceram. Soc.,51 (1951-52, 293–325.Google Scholar
- 12.Li, W.Y. and Riley, F.L., J. Eur. Ceram. Soc.. to be published.Google Scholar
- 13.Patel, M., Riley, F.L., Castro, F., LeDoussal, H. and Cales, B., β’-sialon from a low-cost siliceous waste material, to be published.Google Scholar