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X-ray images of defect formation in porcelain ceramics during drying

Citation

Potter, AR and Austin, JC and Ormerod, RM and Haycock, PW and Heywood, BR and George, SD, X-ray images of defect formation in porcelain ceramics during drying, NDT and E International, 36, (2) pp. 77-83. ISSN 0963-8695 (2003) [Refereed Article]

DOI: doi:10.1016/S0963-8695(02)00088-9

Abstract

The drying phase during the manufacture of ceramic pieces is often the point of failure owing to the formation of cracks. In this study, non-destructive microfocus X-ray imaging has been employed to study the onset of cracking in porcelain and correlate it with the moisture content. Samples of moist porcelain paste were extruded through dies of 30 and 50mm diameter. Sections of the extrudate were placed into an X-ray transparent oven and imaged while drying at constant temperature and low humidity. The time to the onset of cracking was found to be a function of temperature. The mode of failure was consistent across the temperature range 40-120C.

The higher the drying temperature, the shorter the time to failure and the higher the moisture loss at failure. For a particular paste consistency and sample geometry there was found to be a critical moisture content below which cracking began to occur. This moisture threshold was observed to be weakly temperature dependent; it appears to be more sensitive to sample geometry and paste consistency. A safe drying curve has been constructed which provides a boundary for the process parameters which prevent cracking. The implication is that during the drying of a ceramic piece, different sections may have different safe parameter boundaries and the process must be designed to keep all sections within the safe region.

Item Details

Item Type:Refereed Article
Keywords:defect detection, radiographic images, X-ray imaging
Research Division:Chemical Sciences
Research Group:Physical Chemistry (incl. Structural)
Research Field:Structural Chemistry and Spectroscopy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Heywood, BR (Professor Brigid Heywood)
ID Code:104466
Year Published:2003
Web of Science® Times Cited:7
Deposited By:Research Division
Deposited On:2015-11-12
Last Modified:2015-11-12
Downloads:0

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