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Powder Metallurgy and Metal Ceramics

, Volume 53, Issue 9–10, pp 574–582 | Cite as

The Mechanical Properties of Sialon–Boron Nitride Composite Ceramics

  • I. P. Neshpor
  • T. V. Mosina
  • O. N. Grigoriev
  • A. D. Panasyuk
  • A. V. Koroteev
  • N. D. Bega
  • L. M. Melakh
  • I. Zalite
  • A. D. Kostenko
  • N. V. Boshitskaya
Article

The production of sialon and sialon–boron nitride composites using oxidized (up to ~15 wt.% O) Si3N4–18 wt.% AlN composite powders resulting from plasma chemical synthesis is studied. Hot pressing of these powders to nonporous state at 1620–1775°C is accompanied by the formation of composites consisting mainly of a mixture of β-sialon (z = 1.5–2) and o′-sialon. Boron nitride additions in an amount of up to 15 wt.% lead to the formation of composites that contain BN lamellar grains in the matrix of single-phase β-sialon (z = 1.5–2). The mechanical and tribological characteristics of the composites with micron and submicron grains are examined. It is observed that the dependence of scratch hardness on contact strength is almost linear for the sialon ceramics and sialon–boron nitride composites. The material is removed during machining through intensive brittle fracture. The introduction of boron nitride into sialon ceramics in an amount of more than 5% is accompanied by approximately a tenfold increase in the material removal in machining, making possible turning operations.

Keywords

plasma chemical synthesis of powder composite boron nitride sialon hardness contact strength wear machinability 

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • I. P. Neshpor
    • 1
  • T. V. Mosina
    • 1
  • O. N. Grigoriev
    • 1
  • A. D. Panasyuk
    • 1
  • A. V. Koroteev
    • 1
  • N. D. Bega
    • 1
  • L. M. Melakh
    • 1
  • I. Zalite
    • 1
  • A. D. Kostenko
    • 1
  • N. V. Boshitskaya
    • 1
  1. 1.Frantsevich Institute for Problems of Materials ScienceNational Academy of Sciences of UkraineKievUkraine

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