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Abstract
The residual porosity of high-density pure oxide ceramics is considered in relation to permeability. The available data indicate that, to obtain very low permeabilities, densities higher than that at which open porosity can be detected by the usual method of liquid immersion, should be achieved. It is demonstrated that no close relationship between either density or porosity and permeability exists and some of the complicating features are reviewed. It is shown that open porosity may be detected at densities almost up to theoretical, depending on the methods of fabrication and the powder characteristics. Some aspects of powder characteristics are illustrated and discussed and conditions that should aid the achievement of very low permeability are suggested.
Notes
* Manuscript received 1 July 1963. Contribution to a Symposium on “Residual Porosity in Powder Metallurgy” to be held in London on 21 and 22 October 1963.