Mechanical properties and microstructures of co-precipitation derived tetragonal Y2O3-ZrO2-Al2O3 composites

Y-TZP-Al2O3 specimens (2.5 mol pct Y2O3-ZrO2 and 5 to 30 wt pct Al2O3) were prepared from coprecipitated powders and their mechanical properties were studied. The addition of alumina to Y-TZP improves the attainable density of the materials after sintering at 1500 C and reduces the degradation of th...

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Bibliographic Details
Published in:Journal of materials science 1988-05, Vol.23 (5), p.1805-1812
Main Authors: RAJENDRAN, S, SWAIN, M. V, ROSSELL, H. J
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Technical ceramics
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Summary:Y-TZP-Al2O3 specimens (2.5 mol pct Y2O3-ZrO2 and 5 to 30 wt pct Al2O3) were prepared from coprecipitated powders and their mechanical properties were studied. The addition of alumina to Y-TZP improves the attainable density of the materials after sintering at 1500 C and reduces the degradation of their densities due to porosity formation when the materials are sintered above 1500 C. Near-theoretical density could be achieved for most of the samples after HIPing at 1500 C for 0.5 h at 200 MPa pressure. The fracture strength of the HIPed specimens was in the range 2.0 to 2.4 GPa and the stress intensity factor was in the range 3.5 to 6.0 MPa sq rt m. The mechanical strength of the materials was not degraded seriously after autoclaving in water at 175 C for 24 h. The surface layer of transformed monoclinic zirconia was less than 70 microns thick even after autoclaving at 175 C for 5 days. (Author)
ISSN:0022-2461
1573-4803
DOI:10.1007/BF01115724