Densification of sintered lead zirconate titanate by hot isostatic pressing |
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Authors: | K. G. Ewsuk G. L. Messing |
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Affiliation: | (1) Department of Materials Science and Engineering, The Pennsylvania State University, 16802 University Park, Pennsylvania, USA |
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Abstract: | The effects of hot isostatic pressing (HIPing) on sintered lead zirconate titanate are presented. Densities up to 98% were obtained by HIPing for 1 h at 1300°C with argon gas pressures of either 20.7 or 138 MPa. The microstructural changes observed after HIPing, and the rapid initial kinetics for densification and pore shrinkage, indicate that prssure-enhanced grain rearrangement and solution-precipitation processes are primarily responsible for densification. The persistance of large voids after HIPing suggests that it may be impossible to completely eliminate gross processing-related defects in lead zirconate titanate by HIPing. |
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