Different c-BN/c-ZrO2 ratios are shown to affect the phase composition, microstructure, relative density, open porosity, linear shrinkage, physicomechanical properties, and linear correlation of the elastic modulus and toughness of mullite–TiC–c-BN–c-ZrO2 samples during spark-plasma sintering at pressing load 70 MPa and 1200 – 1600°C. The synthesized TiC and c-BN powders and c-ZrO2 spark-plasma sintered at 1400°C are characterized by extensive phase crystallization. Mullite and TiC develop profusely in sintered samples with different c-BN/c-ZrO2 ratios. Increasing the c-BN/c-ZrO2 ratio promotes ingrowth of more c-BN than c-ZrO2 at 1200 – 1600°C and causes a less uniformly and densely sintered crystalline microstructure with many pores to form at 1500°C. This sample has lower physicomechanical properties, a poorer linear correlation of elasticity modulus and toughness at 1200 – 1600°C, and lower crack resistance at 1500°C.
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Translated from Novye Ogneupory, No. 2, pp. 23 – 29, February, 2019.
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Hmelov, A.V. Mullite–TiC–c-BN–c-ZrO2 materials Produced by Spark-Plasma Sintering and Their Properties. Refract Ind Ceram 60, 86–91 (2019). https://doi.org/10.1007/s11148-019-00314-0
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DOI: https://doi.org/10.1007/s11148-019-00314-0