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THE MICROSTRUCTURAL EVOLUTION OF ZIRCONIA CERAMICS DURING SINTERING

Chen, Tiandan (2007) THE MICROSTRUCTURAL EVOLUTION OF ZIRCONIA CERAMICS DURING SINTERING. Master's Thesis, University of Pittsburgh. (Unpublished)

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Abstract

ZrO2-3mol%Y2O3 powders were pressed uniaxially using loads of 51 MPa and isothermal sintered at 1275OC. Measurements of the pore size, grain size and pore distribution indicated that contrary to the assumption of the phenomenological models of sintering, pore elimination was involved in densification and coarsening during the intermediate stage sintering. SEM imaging showed that many triple points did not contain pores. Thus the pore separation rather than the grain size should correlate with diffusion length. Pore boundary tessellation showed that the elimination of fine pores resulted in a heterogeneous microstructure in intermediate stage sintering containing regions of high solid volume fraction (>0.9). Higher pressing pressure (238 MPa) or higher sintering temperature (1315 OC) resulted in a higher densification rate and microstructural heterogeneity over a larger length scale.

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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Chen, Tiandantic9@pitt.eduTIC9
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairNettleship, Iannettles@pitt.eduNETTLES
Committee MemberLeonard, John Pjleonard@engr.pitt.edu
Committee MemberFulay, Pradeep Pfulay@engr.pitt.eduPPP
Date: 31 January 2007
Date Type: Completion
Defense Date: 31 August 2006
Approval Date: 31 January 2007
Submission Date: 24 October 2006
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Materials Science and Engineering
Degree: MSMSE - Master of Science in Materials Science and Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: ceramic; microstructural evolution; sintering; Zirconia
Other ID: http://etd.library.pitt.edu/ETD/available/etd-10242006-222004/, etd-10242006-222004
Date Deposited: 10 Nov 2011 20:03
Last Modified: 19 Dec 2016 14:37
URI: http://d-scholarship.pitt.edu/id/eprint/9509

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