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Plasma-Spark Sintering of Oxide–Non-Oxide Components with the Addition of a TiC–ZrC Solid Solution and Various Metal Powder Mixtures

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Refractories and Industrial Ceramics Aims and scope

The effects of powder mixtures of W–Mo and Zr–Ti combined with sintered solid solution TiC–ZrC during spark plasma sintering of compositions at a pressing load of 60 MPa in the range 1200 – 1600°C on the phase composition, microstructure, grain sizes of crystalline phases, relative density, linear shrinkage, physical-mechanical properties, and linear correlation of elasticity modulus and fracture toughness of mullite–β-Si3N4–c-BN samples are shown in the present work. Synthesized powders of β-Si3N4 and c-BN are characterized by extensive crystallization of β-Si3N4 and c-BN. Solid solution TiC–ZrC sintered by a spark-plasma method at 1800°C shows roughly equal crystallization of (Zr,Ti)C and (Ti, Zr)C and a nonuniform and incompletely sintered crystalline microstructure. Samples with W–Mo and Zr–Ti mixtures sintered in the range 1200 – 1600°C show extensive mullitization; active crystallization of β-Si3N4, (Ti,Zr)C, solid solutions Mo, Wand W, Mo, and β-Zr,Ti; and lower crystallization of c-BN, (Zr,Ti)C, and β-Ti,Zr. The W–Mo mixture in the range 1400 – 1600°C favors the formation of a more uniformly and densely sintered microstructure of the ceramic phase; roughly round-shaped particles of solid solutions Mo, W and W, Mo in the metallic phase; more reinforced boundary areas of ceramic-metallic and metallic phases; and polydisperse grain compositions of crystalline phases. As a result, the composition with the W–Mo mixture sinters more uniformly and gradually in the range 1200 – 1600°C with the corresponding sample showing greater values of physical-mechanical properties, higher cracking resistance, and a greater linear correlation of the elasticity modulus and fracture toughness.

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  1. Institute of Silicate Materials, Riga Technical University, 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. 10, pp. 27 – 38, October, 2020.

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Hmelov, A.V. Plasma-Spark Sintering of Oxide–Non-Oxide Components with the Addition of a TiC–ZrC Solid Solution and Various Metal Powder Mixtures. Refract Ind Ceram 61, 568–579 (2021). https://doi.org/10.1007/s11148-021-00522-7

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  • DOI: https://doi.org/10.1007/s11148-021-00522-7

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