NDLI: Effects of amount and type of cation species on the phase formation of single and codoped α-SiAlONs

Content Provider	Springer Nature Link
Author	Kugler, Kurt Ravlich, Ivan Jones, Mark I.
Copyright Year	2011
Abstract	The phase formation of single phase α-SiAlON ceramics based on α-Si$_{3}$N$_{4}$ was investigated using different rare earth (RE) or metallic cations to stabilise the α-phase. The effects of sintering temperature, size and type of stabilising cation and the addition of extra liquid forming additives on the phase transformation of α-Si$_{3}$N$_{4}$ to α-SiAlON were considered. The influence of the chosen parameters on properties such as density and hardness is furthermore discussed for Ca-codoped silicon aluminium oxynitride (SiAlON) ceramics (50% RE cations combined with 50% calcium cations). For smaller and larger RE systems different intermediate phases occur and the dissolution of sintering additives takes place at different temperatures, resulting in different amounts of SiAlON at a given sintering temperature. For smaller cations, the SiAlON formation is favoured below 1,750 °C compared to larger cations. The addition of extra liquid to the starting composition supports the SiAlON formation above the eutectic temperature. Contrary to the RE systems the calcium-doped samples did not show an intermediate phase during sintering. The cation solubility for sintering additives is higher and therefore the amount of SiAlON created below 1,750 °C increased. The final amount of SiAlON at 1,850 °C was about the same for all systems. Mechanical properties are also influenced by the composition of the starting powder. In general, increasing temperature leads to higher density and hardness.
Starting Page	1205
Ending Page	1216
Page Count	12
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	47
Issue Number	3
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2011-06-15
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Continuum Mechanics and Mechanics of Materials Mechanics Crystallography Characterization and Evaluation of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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