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Desintering Process in the Gas-Pressure Sintering of Silicon Nitride
Ist Teil von
Journal of the American Ceramic Society, 1997-02, Vol.80 (2), p.329-335
Ort / Verlag
Westerville, Ohio: American Ceramics Society
Erscheinungsjahr
1997
Link zum Volltext
Quelle
Wiley Online Library (Online service)
Beschreibungen/Notizen
A unique desintering phenomenon has been observed in gas‐pressure sintering of silicon nitrides with additives of yttria and alumina. The desintering phenomenon occurred, simultaneous with weight increase, only when a boron nitride crucible was used in combination with the application of high nitrogen pressure (5 MPa). When the nitrogen pressure was low (0.5 MPa), or when the boron nitride crucible was replaced by a graphite crucible, this desintering phenomenon was not observed. These results could be rationalized by the chemical dissolution of nitrogen into the oxynitride melts and the resultant evolution of carbon monoxide. This indicates that the high nitrogen overpressure employed in gas‐pressure sintering of silicon nitride ceramics is not always beneficial.