Mechanical Properties and Stabilization Behavior of Ce-TZP Ceramics Prepared by Coating Process

Abstract

Abstract: The microstructure of Ce-TZP ceramics processed by a coating technique, compared to co-precipitated
powder-based Ce-TZP, was analysed using a combination of XRD, SEM, TEM, etc. The results showed that CeO₂-coated powder-based zirconia ceramics
exhibited higher fracture toughness than co-precipitated powder-based zirconia ceramics in spite of a little decreasing hardness. Besides, a
small amount of alumina addition can significantly improve the fracture toughness of CeO₂-coated powder-based zirconia ceramics. In contrast
with homogeneous grain size and stabilizer content distribution of co-precipitated powder-based Ce-TZP ceramics, SEM and EPMA analysis
revealed that coating process resulted in wider grain size and stabilizer content distribution in this Ce-TZP ceramics. The superior fracture
toughness of CeO₂-coated Ce-TZP ceramics was mainly attributed to a fraction of highly transformable tetragonal ZrO₂ grains with low ceria
content. The residual stress existing between anisotropic monoclinic and tetragonal grains, and the thin glass films containing alumina and silica
at grain boundary observed by TEM, were believed to benefit the preservation more tetragonal grains during sintering, contributing to the stress-induced
martensitic phase transformation.

Key words: Ce-TZP ceramics, coating, mechanical properties, phase transformation

CLC Number:

TQ174

FANG Ping-An,GU Hui,Vleugels Jef,Van der Biest Omer. Mechanical Properties and Stabilization Behavior of Ce-TZP Ceramics Prepared by Coating Process[J]. Journal of Inorganic Materials.

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Mechanical Properties and Stabilization Behavior of Ce-TZP Ceramics Prepared by Coating Process

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