Hertzian Indentation Damage Behavior of Highly Porous Silicon Nitrides


Article Preview

Highly porous Si3N4 ceramics in service are usually subjected to continuous impact of solid particles which may give rise to localized damage and consequently to strength degradation. Hertzian indentation and three-point bending tests were conducted to investigate the contact damage behavior of highly porous Si3N4 ceramics in this paper. The Hertzian indentation damage morphologies were examined by using a bonded-interface technique. As a result of intragranular microfracture under Hertzian indentation, a distributed subsurface damage region is developed beneath the indenter. It was shown that, with increasing indentation load, the damage region extends progressively and a quasi-plastic stress-strain response exhibits. Failure sources were observed to be Hertzian indentation sites in three-point bending tests, leading to a gradual strength degradation.



Materials Science Forum (Volumes 544-545)

Edited by:

Hyungsun Kim, Junichi Hojo and Soo Wohn Lee




H. Zeng et al., "Hertzian Indentation Damage Behavior of Highly Porous Silicon Nitrides", Materials Science Forum, Vols. 544-545, pp. 339-342, 2007

Online since:

May 2007




[1] She, J. H., Yang, J. F., Beppu, Y. S. H. S., Ohji, T. T. K., Hertzian contact damage in a high porous silicon nitride ceramic. J. Eu. Ceram. Soc., 2003, 23, 1193-1197.

DOI: 10.1016/s0955-2219(02)00301-1

[2] Makino, H., Kamiya, N. and Wada, S., Effects of grain size of hot-pressed silicon nitride on contact damage morphology and residual strength. J. Am. Ceram. Soc., 1991, 74, 2001-(2004).

DOI: 10.1111/j.1151-2916.1991.tb07822.x

[3] Xu, H. H. K., Wei, L., Padture, N. P., Lawn, B. R. and Yeckley, R. L., Effect of microstructural coarsening on Hertzian contact damage in silicon nitride. J. Mater. Sci., 1995, 30, 869-878.

DOI: 10.1007/bf01178419

[4] Lawn, B. R., Indentation of ceramics with spheres: a century after hertz. J. Am. Ceram. Soc., 1998, 81, 1977-(1994).

[5] Lee, S. K. and Lawn, B. R., Contact fatigue in silicon nitride. J. Am. Ceram. Soc., 1999, 82, 1281-1288.

[6] Fischer-Cripps, A. C. and Lawn, B. R., Stress analysis of contact deformation in quasi-plastic ceramics. J. Am. Ceram. Soc., 1996, 79, 2609-2618.

DOI: 10.1111/j.1151-2916.1996.tb09023.x

[7] Lee, S. K., Wuttiphan, S. and Lawn, B. R., Role of microstructure in Hertzian contact damage in silicon nitride: I. Mechanical characterization. J. Am. Ceram. Soc., 1997, 80, 2367-2381.

DOI: 10.1111/j.1151-2916.1997.tb03129.x

Fetching data from Crossref.
This may take some time to load.