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Powder Metallurgy and Metal Ceramics

, Volume 55, Issue 3–4, pp 185–194 | Cite as

Sintering of Zirconium Diboride and Phase Transformations in the Presence of Cr3C2

  • O. N. Grigoriev
  • V. B. Vinokurov
  • L. I. Klimenko
  • N. D. Bega
  • N. I. Danilenko
Article

The kinetics of sintering and phase interactions in the diffusion contact zones of Cr3C2 and ZrB2 are investigated. It is found that using Cr3C2 as a sintering activator for ZrB2 sintering reduces the hot pressing temperature from 2200°C to 1500–1750°C, depending on the Cr3C2 content. The phase formation accompanied with the formation of new high-temperature refractory compounds, such as zirconium carboborides, chromium borides and carboborides, and zirconium-chromium carboborides, rapidly develops at the Cr3C2 and ZrB2 interface within the diffusion zone. An intense diffusion of chromium and carbon into zirconium diboride accompanied with the formation of nonporous states in zirconium diboride (to a depth of 50–100 μm at 1360°C) near diffusion contact zone is observed. It is established that the contact interaction during sintering in the diffusion zone results in the formation of the vanishing eutectic liquid phase, which is consumed to forming new high-refractory compounds (phases based on zirconium carbide and chromium borides).

Keywords

hot pressing in vacuum compacting kinetics X-ray phase analysis contact interaction diffusion zone structure and phase formation X-ray diffraction analysis vanishing eutectic phase chemical microinhomogeneity chromium carbide zirconium diboride chromium boride zirconiumchromium carboboride 

References

  1. 1.
    A. Belossi, S. Guicciardi, V. Medri, et al., “Processing and properties of ultra-refractory composites based on Zr- and Hf-borides: state of the art and perspectives,” in: Boron Rich Solids: Sensors, Ultra High Temperature Ceramics, Thermoelectrics, Armor, N. Orlovskaya and M. Lugovy (eds.), Springer Netherlands, Dordrecht (2011), pp. 147–160.Google Scholar
  2. 2.
    N. D. Bega, V. B. Vinokurov, O. N. Grigoriev, et al., Study of Compaction Kinetics for ZrB 2 –Cr 3 C 2 -Based Materials during Hot Pressing; III International Samsonov Conference (May 2012, Kiev, Ukraine), Kiev (2012), p. 120.Google Scholar
  3. 3.
    3. V. G. Kayuk and V. A. Maslyuk, “Structure formation in alloys of the Cr3C2–TiN system and the properties of materials based on them,” Powder Metall. Met. Ceram., 43, Nos. 1–2, 39–43 (2004).CrossRefGoogle Scholar
  4. 4.
    A. K. Shurin and V. E. Panarin, “State diagrams and the structure of alloys in Cr–ZrB2 and Cr–HfB2 quasibinary systems,” Dokl. AN USSR, Series A, No. 1, 87–90 (1975).Google Scholar
  5. 5.
    O. N. Grigoriev, V. A. Galanov, V. A. Kotenko, et al., “Mechanical properties of ZrB2–SiC(ZrSi2) ceramics,” J. Europ. Ceram. Soc., 30, 2173–2181 (2010).CrossRefGoogle Scholar
  6. 6.
    V. M. Zalkin, Eutectics and Contact Melting Effect [in Russian], Metallurgiya, Moscow (1987), p. 152.Google Scholar

Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • O. N. Grigoriev
    • 1
  • V. B. Vinokurov
    • 1
  • L. I. Klimenko
    • 1
  • N. D. Bega
    • 1
  • N. I. Danilenko
    • 1
  1. 1.Frantsevich Institute for Problems of Materials ScienceNational Academy of Sciences of UkraineKievUkraine

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