Effects of Sc2O3 sintering aid for the densification and mechanical properties of SiC–ZrB2 composites
Source abstract
Abstract
Abstract This study examined the effects of a Sc 2 O 3 sintering aid on the density, microstructure and mechanical properties of SiC–5 vol% ZrB 2 composites prepared by hot-pressing. Microstructural studies showed that the addition of Sc 2 O 3 not only caused a decrease in the hot-pressing temperature from 1950 to 1750 °C by liquid phase sintering, but also resulted in the formation of crystalline Sc 4 Zr 3 O 12 at the grain boundaries via a reaction with ZrO 2 on the surface of the ZrB 2 powder. The addition of Sc 2 O 3 produced a fine-grained microstructure with a 43% (430→615 MPa) and 20% (3.6→4.3 MPa m 1/2 ) increase in flexural strength and fracture toughness, respectively, compared to the SiC–ZrB 2 composite without Sc 2 O 3 .
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Aluminum Alloys Composites Properties
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