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Development of Oxide-Free Oxide Materials under Spark-Plasma Sintering Conditions of a Mixture of Oxide-Free Components and Various Metal Powder Additives

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The effects of Wand Mo power additives during spark-plasma sintering of compositions at compression force 60 MPa at 1200 – 1600°C on the phase composition, microstructure, crystalline-phase grain size, relative density, linear shrinkage, physicomechanical properties, and the linear correlation of the elasticity modulus and fracture toughness of mullite–ZrB2–β-SiC–TaC samples were studied. The synthesized ZrB2, β-SiC, and TaC powders were characterized by extensive crystallization of ZrB2, β-SiC, and TaCcub, respectively. Sintered samples withWand Mo powder additives showed extensive mullite formation and more active crystallization of β-SiC, (Zr, Ta)B, C, β-WC, and β-WB than (Ta, Zr)C, B, β-MoC, β-MoB, and MoB2 at 1200 – 1600°C. The microstructure of the sample with the Mo additive at 1500°C was more uniformly and densely sintered and crystalline; contained fewer pores and weakly sintered areas; and was more reinforced at the boundaries of oxide-free oxide and oxide-free crystalline phases. This sample had characteristically smaller grain sizes of the crystalline phases at 1400 – 1600°C and showed uniform growth of the relative density, linear shrinkage, and physicomechanical properties; higher crack resistance (with propagation of microcracks along a meandering path), and a better linear correlation of the elasticity modulus and fracture toughness at 1200 – 1600°C.

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Authors and Affiliations

  1. Riga Technical University, Institute of Silicate Materials, Riga, Latvia

    A. V. Hmelov

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  1. A. V. Hmelov
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Correspondence to A. V. Hmelov.

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Translated from Novye Ogneupory, No. 2, pp. 17 – 25, February, 2020.

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Hmelov, A.V. Development of Oxide-Free Oxide Materials under Spark-Plasma Sintering Conditions of a Mixture of Oxide-Free Components and Various Metal Powder Additives. Refract Ind Ceram 61, 73–81 (2020). https://doi.org/10.1007/s11148-020-00433-z

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  • DOI: https://doi.org/10.1007/s11148-020-00433-z

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