Ultrahigh temperature ceramics (UHTCs) based on ZrB2 and HfB2 systems: powder synthesis, densification and mechanical properties

Guo-Jun Zhang, Wei-Ming Guo, De Wei Ni, Yan-Mei Kan

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

Phase pure ZrB2 and HfB2 powders were synthesized by boro/carbothermal reduction (BCTR) of ZrO2 and borothermal reduction of HfO2, respectively. Combining the thermodynamic calculations and XRD results, the reaction process of BCTR of synthesized ZrB2 powder was shown. The ZrB2 powder synthesized at 1650 degrees C showed a better sinterability, due to its smaller particle size and lower oxygen content. Most of the HfB2 particles obtained at 1600 degrees C presented nearly column-like morphology with 1-1.5 mu m size. Using the synthesized HfB2 powder and commercial alpha-SiC, hot-pressed HfB2-20 vol.% SiC composite has high flexural strength of 993 +/- 90 MPa and fracture toughness of 6.29 +/- 0.65 MPa.m(1/2), which were significantly higher than the reported values in literature.
Original languageEnglish
Article number012041
Book seriesJournal of Physics: Conference Series (Online)
Volume176
Number of pages12
ISSN1742-6588
DOIs
Publication statusPublished - 2009
Externally publishedYes
Event16th International Symposium on Boron, Borides and Related Materials - Matsue, Shimane, Japan
Duration: 7 Sep 200812 Sep 2008
Conference number: 16

Conference

Conference16th International Symposium on Boron, Borides and Related Materials
Number16
CountryJapan
CityMatsue, Shimane
Period07/09/200812/09/2008

Keywords

  • PHYSICS,
  • DIBORIDE-BASED CERAMICS
  • ZIRCONIUM DIBORIDE
  • PRESSURELESS DENSIFICATION
  • SILICON-NITRIDE
  • BORON-CARBIDE
  • COMPOSITES
  • HAFNIUM
  • OXIDATION
  • MICROSTRUCTURE
  • ADDITIONS

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