Oxidation behaviour of an aluminium nitride-hafnium diboride ceramic composite

Davide Mattia, Martine Desmaison-Brut, Svetlana Dimovski, Yury Gogotsi, Jean Desmaison

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

An aluminum nitride-hafnium diboride electroconductive particulate composite was produced via hot isostatic pressing without sintering aids. Oxidn. kinetics studies were performed up to 1350 DegC under a flow of pure oxygen using a microbalance. The reaction products were analyzed using SEM and XRD techniques. This composite had a high oxidn. resistance up to 1200 DegC. The kinetic curves had an asymptotic or paralinear shape. The formation of a protective oxide scale contg. hafnia (HfO2) and aluminum borate (Al18B4O33) phases embedded in a glassy phase was obsd. The evapn. of B2O3 was limited by the formation of refractory aluminum borate. Above 1200 DegC, morphol. observations showed the formation of a Maltese cross structure assocd. with the cracking of the oxide scale along the edges resulting in sigmoidal oxidn. kinetics and in a high oxidn. rate of the ceramic composite.
Original languageEnglish
Pages (from-to)1789-1796
Number of pages8
JournalJournal of the European Ceramic Society
Volume25
Issue number10
Publication statusPublished - 2005

Keywords

  • oxidn. behavior of electroconductive aluminum nitride-hafnium diboride ceramic composites)
  • oxidn aluminum nitride hafnium diboride ceramic composite
  • Ceramic composites
  • Oxidation kinetics (oxidn. behavior of electroconductive aluminum nitride-hafnium diboride ceramic composites)
  • Electric conductors
  • Oxidation (resistance
  • Scale (oxide

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