Controlling Grain Growth
A thermodynamic view is taken to explain how inclusions and lattice strains (developed when adjacent grains have slightly different lattice parameters) can be used to control grain growth in advanced ceramics. Experimental data are presented for the cases where A12O3 inclusions are used to inhibit normal grain growth in cubic ZrO2, ZrO2 inclusions inhibit abnormal grain growth of A12O3 and, compositional differences between adjacent grains, developed during slow partitioning, dramatically inhibit grain growth for compositions fabricated in the two-phase region of the ZrO2-Y2O3 system.
KeywordsAnisotropy Zirconium Shrinkage Pyrolysis Yttrium
Unable to display preview. Download preview PDF.
- 1.B. Kellett and F.F. Lange, “Relation Between Grain Growth and Pore Closure: Experimental Observations,” to be published.Google Scholar
- 2.S.K. Kurtz and F.M.A. Carpay, “Microstructure and Normal Grain Growth in Metals and Ceramics: Part I, Theory,” J. Appl. Phys. 5l , 5725 (1980).Google Scholar
- 3.T.K. Gupta, “Possible Correlations Between Density and Grain Size During Sintering,” J. Am. Ceram. Soc. 55 , 176 (1972).Google Scholar
- 4.C. Zener, kindly quoted by C.S. Smith, Trans. Met. Soc. AIME 175, 15 (1949).Google Scholar
- 6.F.F. Lange and M.M. Hirlinger, “Grain Growth Phenomena in Two-Phase Ceramics: AI2O3 Inclusions in Zr02,” AFOSR Final Report, Contract No. F49620-81-C-0036, April 1985.Google Scholar
- 8.F.F. Lange and M.M. Hirlinger, “Phase Distribution Studies Using Energy Dispersive X-Ray Spectral Analysis,” J. Mat. Sci. Let.4 1437–41 (1985).Google Scholar
- 9.F.F. Lange, D.B. Marshall and J.R. Porter (to be published).Google Scholar
- 11.R. Ruh, K.S. Mazdiyasni, P.G. Valentine and H.O. Bielstein, “Phase Relatons in the System ZrO2-Y2O3 at Low Y2O3 Contents,” J. Am. Ceram. Soc. 67, C-190 (1984).Google Scholar