Banda, JS & Messer, PF


Fractographic Identification of Defects in Pottery Test-pieces Fractured in a Ring Bursting Test, by J.S. Banda and P.F. Messer, Zambia Journal of Science and Technology, Vol.9, no.1, September 1991, Pg. 35-42.


Fractographic techniques were employed to identify fracture origins in pottery bodies containing equal proportions of china clay, ball clay, feldspar and quartz, using ring test-pieces. The test-pieces were formed by pressing ordinary and spray-dried powders and by a plastic pressing method and fired by soaking for 6 hours at a range of temperatures between 1088°C and 1306°C. Several defects have been identified. They include fissures, pores, large grains and aggregates. Their maximum dimensions ranged from 170 to 1300 mm, with the majority in the range 300-500mm. Flaws were easily identifies in bodies containing fine quartz with median sizes of 4 mm and 14 mm. In bodies containing coarse quartz only three-dimensional surface and internal flaws could be unambiguously identified.

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