SiAlON ceramics from preceramic polymers and nano-sized fillers

Application in ceramic joining

E. Bernardo, G. Parcianello, P. Colombo, J. H. Adair, A. T. Barnes, J. R. Hellmann, B. H. Jones, J. Kruise, J. J. Swab

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Commercial polysiloxanes filled with alumina nano-particles have been employed for the preparation of β-SiAlON-based ceramics in the temperature range 1450-1550. °C in nitrogen atmosphere. The formation of β-SiAlON was found to be preceded by the formation of intermediate alumino-silicate phases. The SiAlON yield was affected by the occurrence of phase separation in the oxycarbide ceramic residue (SiOC) derived from the silicones and by the partial vaporization of silica, by reduction into gaseous SiO, leading to products with an oxide contamination, consisting of corundum. Filled silicones finally found a promising application in the ceramic joining, sandwiched between two pre-existing α-β (Yb-)SiAlON pieces and treated at high temperature (1550. °C): with a proper formulation, a significant inter-diffusion was observed between the joining layer and the SiAlON parts, causing the evolution of a homogeneous joint region, matching the microstructure and the mechanical properties of the parent ceramics. The pre-oxidation of the SiAlON, generally aiding the wetting of the joining media prior to thermal treatment, showed no significant benefit on the microstructure. On the contrary, the addition of a small load during the thermal treatment allowed the formation of strong joints, not exhibiting any significant difference in mechanical properties with the parent material.

Original languageEnglish (US)
Pages (from-to)1329-1335
Number of pages7
JournalJournal of the European Ceramic Society
Volume32
Issue number7
DOIs
StatePublished - Jun 1 2012

Fingerprint

Joining
Silicones
Fillers
Polymers
Aluminum Oxide
Heat treatment
Siloxanes
Silicates
Mechanical properties
Microstructure
Corundum
Vaporization
Silicon Dioxide
Phase separation
Oxides
Wetting
Contamination
Nitrogen
Alumina
Silica

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Bernardo, E. ; Parcianello, G. ; Colombo, P. ; Adair, J. H. ; Barnes, A. T. ; Hellmann, J. R. ; Jones, B. H. ; Kruise, J. ; Swab, J. J. / SiAlON ceramics from preceramic polymers and nano-sized fillers : Application in ceramic joining. In: Journal of the European Ceramic Society. 2012 ; Vol. 32, No. 7. pp. 1329-1335.
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SiAlON ceramics from preceramic polymers and nano-sized fillers : Application in ceramic joining. / Bernardo, E.; Parcianello, G.; Colombo, P.; Adair, J. H.; Barnes, A. T.; Hellmann, J. R.; Jones, B. H.; Kruise, J.; Swab, J. J.

In: Journal of the European Ceramic Society, Vol. 32, No. 7, 01.06.2012, p. 1329-1335.

Research output: Contribution to journalArticle

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T1 - SiAlON ceramics from preceramic polymers and nano-sized fillers

T2 - Application in ceramic joining

AU - Bernardo, E.

AU - Parcianello, G.

AU - Colombo, P.

AU - Adair, J. H.

AU - Barnes, A. T.

AU - Hellmann, J. R.

AU - Jones, B. H.

AU - Kruise, J.

AU - Swab, J. J.

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AB - Commercial polysiloxanes filled with alumina nano-particles have been employed for the preparation of β-SiAlON-based ceramics in the temperature range 1450-1550. °C in nitrogen atmosphere. The formation of β-SiAlON was found to be preceded by the formation of intermediate alumino-silicate phases. The SiAlON yield was affected by the occurrence of phase separation in the oxycarbide ceramic residue (SiOC) derived from the silicones and by the partial vaporization of silica, by reduction into gaseous SiO, leading to products with an oxide contamination, consisting of corundum. Filled silicones finally found a promising application in the ceramic joining, sandwiched between two pre-existing α-β (Yb-)SiAlON pieces and treated at high temperature (1550. °C): with a proper formulation, a significant inter-diffusion was observed between the joining layer and the SiAlON parts, causing the evolution of a homogeneous joint region, matching the microstructure and the mechanical properties of the parent ceramics. The pre-oxidation of the SiAlON, generally aiding the wetting of the joining media prior to thermal treatment, showed no significant benefit on the microstructure. On the contrary, the addition of a small load during the thermal treatment allowed the formation of strong joints, not exhibiting any significant difference in mechanical properties with the parent material.

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