Abstract
ABSTRACTMicrostructures, mechanical properties, thermal shock resistance, as well as oxidation resistance of short carbon fiber (Cf) and nano ZrB2 enhanced SiC-BN ceramics were investigated systematically. Results showed that ZrB2 induced the structure developments of BN, graphite plates and SiC particles. Consequently, flexural strength reached 378.2 MPa and fracture toughness reached 5.80 MPa.m1/2. Mechanical properties of ZrB2 and Cf reinforced SiC-BN ceramics outperformed the properties of Cf and SiCf reinforced SiC-BN ceramics significantly. SiC-BN/ZrB2/Cf composites showed good thermal shock resistance below 1000oC, where a residual strength of 218 MPa can be obtained for the specimen tested at a temperature difference (ΔT) of 800oC. The enhancing mechanisms can be described as carbon fiber and BN/C plates ‘pull-out’, ‘crack bridging’, etc.
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