Grain Growth in Very Porous Al 2 O 3 Compacts
Authors:
- 1 March 1972
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 55 (3) , 142-146
Abstract
Extensive grain growth was observed by scanning electron microscopy in very porous Al 2 O 3 compacts, even at densities <40% of theoretical. After ∼7% shrinkage at 1700°C, the grain size increased from ∼0.3 to 0.51 μm in a compact having a relative green density of 0.31. During grain growth in highly porous compacts, the grains appear initially to be chainlike, then to be oblong, and finally to be equiaxed. The proposed mechanism of initial grain growth involves the filling of necks between adjacent grains followed by the movement of the grain boundary through the smaller grain. Although grain growth in very porous compacts is quite different from coalescence and ordinary grain growth, the kinetics are similar.Keywords
This publication has 10 references indexed in Scilit:
- Kinetics of Initial Sintering with Grain GrowthJournal of the American Ceramic Society, 1970
- Characterization of Freeze‐Dried Al 2 O 3 and Fe 2 O 3Journal of the American Ceramic Society, 1970
- Pore‐Grain Boundary Interactions and Grain GrowthJournal of the American Ceramic Society, 1969
- Theory of Grain Growth in Porous CompactsJournal of Applied Physics, 1966
- Grain Growth in Porous CompactsJournal of the American Ceramic Society, 1965
- Morphological Changes of a Surface of Revolution due to Capillarity-Induced Surface DiffusionJournal of Applied Physics, 1965
- Modification of Sintering Kinetics by Solute Segregation in Al 2 O 3Journal of the American Ceramic Society, 1965
- On the theory of normal and abnormal grain growthActa Metallurgica, 1965
- Sintering Crystalline Solids. II. Experimental Test of Diffusion Models in Powder CompactsJournal of Applied Physics, 1961
- Measurement of Particle Sizes in Opaque BodiesJOM, 1953