Chapter 23. Effect of Filler Size on the Strength of Porcelain Bodies

  1. William M. Carty
  1. William M. Carty and
  2. Brian M. Pinto

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294734.ch23

Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 23, Issue 2

Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 23, Issue 2

How to Cite

Carty, W. M. and Pinto, B. M. (2002) Effect of Filler Size on the Strength of Porcelain Bodies, in Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 23, Issue 2 (ed W. M. Carty), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294734.ch23

Author Information

  1. Whiteware Research Center; New York State College of Ceramics at Alfred University, Alfred, New York

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375778

Online ISBN: 9780470294734

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Keywords:

  • effect of filler size;
  • porcelain bodies;
  • quartz;
  • mechanical stress;
  • alumina porcelain

Summary

The objective of this study was to investigate the stress and strain levels present in quartz and alumina-bearing porcelains, and correlate these values to mechanical strength. Data indicated that residual strain increased as filler particle size increased, but only to a critical value, afier which strain decreased, indicating a relaxation caused by spontaneous microcracking of quartz grains. The maximum strain was observed for samples containing 87 pm quartz grains. Analysis of stresses and strains generated between quartz grains and the surrounding glass phase demonstrate that cracking must first occur in the weaker filler grains, not the glass phase, as is commonly reported. Mechanical strength was maximum in samples containing 26 pm quartz grains, decreasing rapidly upon increase of quartz size. Acoustic emission was used to attribute this trend to the generation of microcracks upon induced loading.