On the reactive spark plasma sinterability of ZrB2–SiC–TiN composite
Journal of Alloys and Compounds(2022)
摘要
In the present research, the influence of TiN addition on the ZrB2–SiC composite was studied. Hereof, TiN-doped ZrB2–SiC composite was manufactured via the route of reactive spark plasma sintering under an applied load of 40 MPa at the peak temperature of 1850 °C for 360 s. Mechanical properties, microstructure evaluation, and sinterability were investigated and compared to the non-doped ZrB2–SiC. X-ray diffraction analysis, thermodynamic appraisal, energy dispersive spectroscopy, and scanning electron microscopy divulged the formation of in-situ h-BN, ZrO2, and ZrN as well as the (Zr,Ti)B2 solid solution in TiN-doped ZrB2–SiC. Comparing the relative density of 95% for the TiN-free sample with the relative density of 94.1% for the sample containing TiN, the addition of TiN increased porosity content owing to the formation of in-situ BN with layered structure. Flexural strength decreased from 460.2 MPa for TiN-free ZrB2–SiC to 435.9 MPa for TiN-doped ZrB2–SiC, due to matrix grain growth and relative density drop. In contrast, indentation fracture toughness and Vickers hardness increased to 6.1 MPa.m1/2 and 29.1 GPa, respectively, as the result of TiN addition.
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关键词
Reactive spark plasma sintering,Microstructure,Mechanical properties,UHTCs
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