Pressureless sintering of Si3N4
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An investigation of the pressureless sintering of Si3N4 powder with the addition of 5 wt % MgO revealed that shrinkage by a liquid phase mechanism and bulk decomposition are two countervailing processes. Within the temperature range studied, i.e. between 1500 and 1750° C, high densities can be achieved when sintering is performed either for long periods at low temperatures or short periods at higher temperatures. A model is presented showing that pore growth due to decomposition causes a decrease in the driving force for sintering and causes shrinkage to cease.
KeywordsPolymer Shrinkage Liquid Phase Pressureless Sinter Pore Growth
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- 1.S. Aito, S. Somiya and K. Kato, J. Jap. Soc. Powder Met. 13 (1966) 186.Google Scholar
- 2.V. K. Kazakov, Trans. Izvest. Akad. Nauk SSSR. Neorganisch Materialy 3 (1967) 1661.Google Scholar
- 3.G. R. Terwilliger, J. Amer. Ceram. Soc. 57 (1974) 48.Google Scholar
- 4.G. R. Terwilliger and F. F. Lange, ibid 57 (1974) 25.Google Scholar
- 5.P. Drew and M. H. Lewis, J. Mater. Sci. 9 (1974) 261.Google Scholar
- 6.R. D. Pehlke and J. F. Elliott, Trans. Met. Soc. AIME 215 (1959) 781.Google Scholar
- 7.E. A. Ryklis, A. S. Bolgar and V. V. Fesenko, Soc. Powder Met. (1969) 73.Google Scholar
- 8.H. D. Batha and E. D. Whitney, J. Amer. Ceram. Soc. (1973) 365.Google Scholar
- 9.W. D. Kingery, J. Appl. Phys. 30 (1959) 301.Google Scholar