The development of β′-SiAlON from silicone resins, mixed with oxide nanoparticles, has already been shown to be particularly complex due to the phase separation of the oxycarbide ceramic residue of the polymers and to the formation of oxygen rich intermediate phases. This paper focuses on the fabrication of SiAlON-SiC composites, in which the phase separation is exploited in yielding part of SiC together with a reactive mixture of silica and carbon, to be combined with a relatively low amount of alumina nanoparticles and additional carbon, from carbon black or phenolic resin. SiC particles were bound by a polymer derived β′-SiAlON phase after treatment at 1500°C (3 h) in nitrogen; although featuring a significant amount of residual porosity (>44%), the developed ceramic composites have remarkable mechanical properties (biaxial bending strength exceeding 70 MPa), especially when containing Y2O3 doping (3 wt-%).

SiAlON bonded SiC ceramics from silicone polymer and nanosized fillers

BERNARDO, ENRICO;PARCIANELLO, GIULIO;COLOMBO, PAOLO;
2013

Abstract

The development of β′-SiAlON from silicone resins, mixed with oxide nanoparticles, has already been shown to be particularly complex due to the phase separation of the oxycarbide ceramic residue of the polymers and to the formation of oxygen rich intermediate phases. This paper focuses on the fabrication of SiAlON-SiC composites, in which the phase separation is exploited in yielding part of SiC together with a reactive mixture of silica and carbon, to be combined with a relatively low amount of alumina nanoparticles and additional carbon, from carbon black or phenolic resin. SiC particles were bound by a polymer derived β′-SiAlON phase after treatment at 1500°C (3 h) in nitrogen; although featuring a significant amount of residual porosity (>44%), the developed ceramic composites have remarkable mechanical properties (biaxial bending strength exceeding 70 MPa), especially when containing Y2O3 doping (3 wt-%).
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2576641
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 7
  • ???jsp.display-item.citation.isi??? 5
  • OpenAlex ND
social impact