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Microstructure evolution during pressureless sintering of bulk oxide ceramics

Keywords: Alumina , Zirconia , Ceria , Strontium titanate , Constant-rate of heating , Rate-controlled sintering , Two-step sintering

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Abstract:

The author’s experience concerning the in uence of the choice of different pressureless heating schedules on the nal microstructure of oxide ceramic materials is summarized in the paper. Alumina, ceria, strontium titanate, as well as tetragonal (3 mol% Y2O3) and cubic (8 mol% Y2O3) zirconia were cold isostatically pressed or injection moulded and pressureless sintered with different heating schedules – namely with Constant-Rate of Heating with different dwell temperatures (CRH), with Rate-Controlled Sintering (RCS) and with Two-Step Sintering (TSS). It was examined whether some of these three sintering schedules, with the same nal density achieved, can lead to a decrease of the grain size of sintered ceramics. The results showed that only TSS (and only for selected materials) brought signi cant decrease of the grain size.

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