Preparation and Properties of Solidified TiC-TiB2 with Hypoeutectic, Eutectic and Hypereutectic Microstructures

Xue Gang Huang; Long Zhang; Zhong Min Zhao; Chun Yin

doi:10.4028/www.scientific.net/AMR.233-235.999

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Kinetics of Camphene Esterification to Isobornyl Acetate
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Preparation and Properties of Solidified TiC-TiB₂ with Hypoeutectic, Eutectic and Hypereutectic Microstructures
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Efficient Production of n-3 Polyunsaturated Fatty Acid-Enriched Feed Oil from Soapstock
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Preparation and Properties of Solidified TiC-TiB₂ with Hypoeutectic, Eutectic and Hypereutectic Microstructures

Abstract:

By using combustion synthesis under high gravity, TiC-TiB₂ fine-grained composite ceramics with hypoeutectic, eutectic and hypereutectic microstructures were prepared through rapid solidification. XRD, FESEM and EDS results show that with increasing TiB₂ content, TiC-TiB₂ composite ceramics transform the microstructures consisting of fine TiB₂ platelets from ones composed of fine TiC spherical grains, whereas when TiB₂ content reaches 50mol%, the ceramics develop the eutectic microstructures that small aspect-ratio TiB₂ platelets were embedded in TiC matrix. Mechanical properties show that relative density, Vickers hardness and flexural strength of TiC-50mol%TiB₂all reach the maximum values (respectively as 98.6 % ,18.4 GPa, 840 MPa) due to eutectic reaction during solidification, meanwhile TiC-50mol%TiB₂ has the maximum fracture toughness of 11.5 MPa∙m^0.5 due to the cooperative action of crack deflection, crack-bridging and pull-out toughening by fine TiB₂ platelets.