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The Structure and Properties of Si6–z Al z O z N8–z Sialons Hot-Pressed from Powders with Activating Oxide Additions

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Powder Metallurgy and Metal Ceramics Aims and scope

The densification and phase formation during hot pressing of three compositions of β′-sialon powders produced from natural raw materials (kaolin) by carbothermal reduction in nitrogen atmosphere are studied. It is determined that the onset temperature of shrinkage decreases with increase in z index. The influence of Y2O3, La2O3, and Sc2O3 additions that activate sintering is examined. Eutectic Sc2O3–A12O3, La2O3–Al2O3, and Y2O3–A12O3 additions activate densification at the initial stage of sintering. It is established that the sialon material with Y2O3–A12O3 addition has the best properties; its strength, fracture toughness, and hardness are close to those of the materials produced by reaction hot pressing from Si3N4, A1N, A12O3, and Y2O3 preliminary synthesized components.

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Authors and Affiliations

  1. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev, Ukraine

    I. P. Neshpor, A. D. Panasyuk, O. V. Pshenichnaya & V. A. Lavrenko

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  1. I. P. Neshpor
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  2. A. D. Panasyuk
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  3. O. V. Pshenichnaya
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  4. V. A. Lavrenko
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Correspondence to I. P. Neshpor.

Additional information

Translated from Poroshkovaya Metallurgiya, Vol. 53, Nos. 7–8 (498), pp. 101–111, 2014.

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Neshpor, I.P., Panasyuk, A.D., Pshenichnaya, O.V. et al. The Structure and Properties of Si6–z Al z O z N8–z Sialons Hot-Pressed from Powders with Activating Oxide Additions. Powder Metall Met Ceram 53, 449–457 (2014). https://doi.org/10.1007/s11106-014-9637-8

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  • DOI: https://doi.org/10.1007/s11106-014-9637-8

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