HRTEM study and mechanical properties of ZrB2–SiC composite: An insight into in-situ carbon formation over the SPS process
Source abstract
Abstract
In this research, we performed studies on the in-situ formation of carbon in the ZrB 2 –25 vol% SiC composite prepared by the spark plasma sintering (SPS) process at 1850 °C. The sintering behavior, microstructure, and mechanical properties of the resulted composite were also evaluated. The sample showed excellent sintering behavior, and a relative density of 99.77% could be obtained. X-ray diffractometry and microstructural results confirmed the in-situ formation of carbon during the SPS process. The source of carbon was found to be a reaction between SiC and its surface oxide. Moreover, the SiO 2 and B 2O 3 compounds could form a low melting point eutectic phase and trigger the liquid phase sintering mechanism. The resulted composite achieved the fracture toughness of 5.63 MPa.m 1/2 , the Vickers hardness of 18.93 GPa, the flexural strength of 741 MPa, and the elastic modulus of 481 GPa.
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