Article ID Journal Published Year Pages File Type
1477421 Journal of the European Ceramic Society 2008 6 Pages PDF
Abstract

Unidirectional carbon fiber reinforced calcium stabilized zirconia composites (uni-Cf/ZrO2) were prepared by slurry infiltration and hot-pressing method. The room temperature mechanical properties were investigated and the fracture features of composites were observed. A flexural strength of 588.0 MPa and fracture toughness of 15.4 MPa·m1/2 parallel to the fiber direction for the composite hot-pressed at 1500 °C was attributed to the fiber pull-out. With increasing hot-pressing temperature from 1500 °C to 1650 °C, the relative density was augmented, but the mechanical properties of composites degraded gradually. Especially at 1650 °C, the flexural strength and fracture toughness decreased significantly to 173.2 MPa and 5.0 MPa·m1/2, respectively. Thermodynamic calculation and XRD, TEM investigations showed that carbon fibers reacted with ZrO2 to form ZrC phase at 1650 °C, and then formed chemical bonding and led to a strong interface between fiber and matrix, which resulted in the decrease of mechanical properties of the composite hot-pressed at higher temperatures. Moreover, the mechanical properties of carbon fibers degraded by the above reaction had also an adverse effect on the mechanical properties of the composite.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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