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Konstitutionsuntersuchungen im System Nd-Si-Al-O-N

 
: Kaiser, A.; Richter, H.J.; Herrmann, M.; Hermel, W.

Petzow, G.; Tobolski, J.; Telle, R.:
Hochleistungskeramiken - Herstellung, Aufbau, Eigenschaften
Weinheim: VCH Verlagsgesellschaft, 1996
ISBN: 3-527-27138-4
S.627-635
Schwerpunktprogramm Keramische Hochleistungswerkstoffe der Deutschen Forschungsgemeinschaft (Abschlußkolloquium) <1995, Stuttgart>
Deutsch
Konferenzbeitrag
Fraunhofer IKTS ()
aluminium oxide; Aluminiumoxid; constitution; Konstitution; neodymium oxide; Neodymoxid; phase relationships; Phasenbeziehungen; Siliciumnitrid; silicon nitride; thermodynamic calculation; thermodynamische Berechnung

Abstract
In connection with the development of silicon nitride ceramics with Nd2O3/Al2O3 sintering additives the subsolidus phase relationships in parts of the the Si3N4-SiO2-AlN-Al2O3-NdN-Nd2O3 system have been studied. At subsolidus temperatures the Nd2O3-Al2O3-SiO2 system can be subdivided into 7 three- phase triangles. The measured solidus temperature is 1368 degrees C. In the Nd2O3-SiO2 system a phase with an defective apatite-type structure are formed. The experimental results show a solubility limit for alumina in the apatite structure of 5 mol-%. With increasing Al2O3 content a linear increase in the a and c lattice constants is observed. Besides the experimental studies thermodynamic calculations are performed using the computer program ThermoCalc.

: http://publica.fraunhofer.de/dokumente/PX-20797.html