An electrophoretic deposition and sintering route was used to prepare YSZ/Al 2 O 3 composites with a compositional gradient. The YSZ content was continuously decreased from the YSZ‐rich surface to the Al 2 O 3 ‐rich surface, Microstructural and Vickers hardness (16–24 GPa) evidence tracked the compositional development, and the indentation fracture toughness was found to vary across the section (10–3 MPa·m 1/2 ).
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Sarkar et al. (1993) studied this question.
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