Abstract
Ti3SiC2 and three different kinds of Ti3SiC2 matrix composites (Ti3SiC2/SiC, Ti3SiC2/Al2O3 and Ti3SiC2/MgAl2O4) were fabricated by reactive hot pressing method. The oxidation resistance of four kinds of materials at 1373 K-1773 K was investigated by X-ray diffraction (XRD)andscanning electron microscope (SEM). The results showed that the main oxidation products of Ti3SiC2 were rutile and cristobalite. The oxidation layers were composed of two layers, the outer was consisted of TiO2, and the inner was a two-phase mixture of TiO2 and SiO2. A large number of pores existed in oxide layers which leading to a poor oxidation resistance. For Ti3SiC2 matrix composites, rutile grains in oxidation layers were refined due to the introduction of the second phase. The volume expansion caused by reactions between Al2O3 (or MgAl2O4) and TiO2 could close pores and improve the densification of oxide layers, which further improve the oxidation resistance of Ti3SiC2/Al2O3 and Ti3SiC2/MgAl2O4. As for the oxidation of Ti3SiC2/SiC, the SiO2 content in oxidation layers was increased from the oxidation of SiC. The dense SiO2 layer acted as a protective film which could prevent the inward diffusion of oxygen. Moreover, liquid phase under high temperature could also fill the pores in oxidation layers. Thus, Ti3SiC2/SiC composite had the best oxidation resistance among three Ti3SiC2 matrix composites.
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