Thermomechanical properties and microstructure of aluinina-zirconia | Zendy

B. L. Mitra | Zendy; N. C. Biswas | Zendy; Paratibha Aggarwal | Zendy

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Thermomechanical properties and microstructure of aluinina-zirconia

Author(s) -

B. L. Mitra,

N. C. Biswas,

Paratibha Aggarwal

Publication year - 1992

Publication title -

bulletin of materials science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.35

H-Index - 72

eISSN - 0973-7669

pISSN - 0250-4707

DOI - 10.1007/bf02927438

Subject(s) - materials science , microstructure , thermal shock , tetragonal crystal system , composite material , yttria stabilized zirconia , cubic zirconia , flexural strength , grain size , ceramic , crystallography , crystal structure , chemistry

Al2O3-ZrO2 composites were prepared in two compositional ranges, 15 wt% ZrO2 and 29wt% ZrO2 with or without yttria or magnesia stabilizers. While 1.5 wt% Y2O3 produced tetragonal ZrO2 and fine grain microstructure, the 4.5 wt% Y2O3 developed cubic and tetragonal ZrO2 with similar microstructure. Al2O3 with 29.5wt% ZrO2-1.5wt% Y2O3 composition had the highest strength (3,300 kg/cm2). The bending strength remained more or less the same after the first thermal shock, and then it decreased gradually, but retained some strength after 20 cycles of quench. The load vs displacement curve became nonlinear after thermal shock possibly because of formation of microcracks which could be seen by microstructural studies.

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