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Subsolidus Phase Relationships of the β–Sialon Solid Solution in the Oxygen-Rich Part of the Nd–Si–Al–O–N System

  • Arno Kaiser EMAIL logo , Rainer Telle , Matthias Herrmann , Hans Jürgen Richter and Waldemar Hermel
Published/Copyright: January 13, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 92 Issue 10

Abstract

The subsolidus phase relationships in the Nd2O3-Al2O3–SiO2 system and in the Si6–zAlzOzN8–z (0 ≤ z ≤ 4)–“Al2O3 : AlN”-Al2O3-Nd2O3-SiO2-range of the Nd–Si–Al–O–N system have been determined. 50 three- and four-phase equilibria were established in this phase region. The phase equlibria define the regions of stable coexistence between β-sialon Si6–zAlzOzN8–z (0 ≤ z ≤ 4) and oxide or oxynitride compounds, which are potential grain boundary phases for silicon nitride ceramics. α-Si3N4 coexists with N-melilite (Nd2Si3–xAlx N4–x (0 ≤ x ≤ 1)), N-α-wollastonite NdSi2ON, a nitrogen-rich (Al, N)-apatite solid solution and Nd2Si2O7. Between 0 ≤ z ≤ 0.8 ß-sialon (Si6–zAlzOzN8–z) is compatible with N-melilite (Nd2Si3–xAlxN4–x (x = 1)), an (Al,N)-apatite of intermediate composition and Nd2Si2O7. The equilibrium phases between z = 0.8 to z = 4 are NdAlO3 and the U-phase (Nd3Si3–xAl3+x O12+xN2–x) as well as NdAl11+ x O18Nx (x = 1) and corundum at the Al-rich terminal composition (z = 4).

Abstract

Die Subsolidus Phasengleichgewichte im Nd2O3–Al2O3–SiO2 System und im Si6–zAlzOzN8–z (0 ≤ z ≤ 4)– “Al2O3: AlN”–Al2O3-Nd2O3-SiO2-Bereich des Systems Nd–Si–Al–O–N wurden bestimmt. Insgesamt konnten innerhalb dieses Zusammensetzungsbereiches 50 Drei- und Vierphasenpolyeder festgelegt werden. Über die Phasengleichgewichte sind die Bereiche stabiler Koexistenz zwischen β-SiAlON Si6–zAlzOzN8–z (0 ≤ z ≤ 4) und oxidischen und oxinitridischen Phasen festgelegt, die somit als potentielle Korngrenzenphasen für Siliciumnitrid-Keramiken in Betracht kommen. β-Si3N4 koexistiert mit N-Melilith (Nd2Si3–xAlxN4–x (0 ≤ x < 1)), N-α-Wollasto-nit NdSi2ON, einem stickstoffreichen (A1,N)-Apatit-Mischkristall und Nd2Si2O7. Zwischen 0 ≤ z ≤ 0.8 ist ß-SiAlON (Si6–zAlzOzN8–z) kompatibel mit N-Melilit (Nd2Si3–xAlxN4–x (x = 1)), einem (Al, N)-Apatit intermediärer Zusammensetzung und NdM2Si2O7. Gleichgewichts phasen zwischen z = 0.8 und z = 4 sind NdAlO3 und die U-Phase (Nd3Si3– xAl3+xO12+x) sowie an der Al-reichen Löslichkeitsgrenze (z = 4) NdAl11+xO18Nx mit (x = 1) und Korund.

Keywords: Nd-Si-Al-O-N system; Subsolidus phase relationships; Silicon nitride; β-sialon
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Received: 2001-05-14
Published Online: 2022-01-13

© 2001 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Dieter Neuschütz 65 Years
  4. Aufsätze/Articles
  5. Combinatorial Methods for Advanced Materials Research & Development
  6. Chemische Gasphasenabscheidung von SiC und SiC + Si auf Kohlenstoffsubstraten und ihre chemische Oberflächenmodifizierung
  7. Fabrication and Characterization of Hydrogen Absorption LaNi5 Alloy Films Sputtered on Nickel Substrate
  8. On the Importance of Gas Phase Chemistry in Two CVD Systems: Deposition of Silicon and Diamond
  9. Thermodynamic Prediction of Metastable Coating Structures in PVD Processes
  10. Setting Kinetic Controls for Complex Equilibrium Calculations
  11. Modeling of the Thermochemical Properties of Multicomponent Oxide Melts
  12. Subsolidus Phase Relationships of the β–Sialon Solid Solution in the Oxygen-Rich Part of the Nd–Si–Al–O–N System
  13. Investigation of Microstructure and Chemical Stability in Composites of NiAl Reinforced by Alumina-Silica Fibers
  14. Gesicherte Interpretationen der FTIR-Reflexionsspektren von SiC–CVD-Schichten durch Spektrensimulation
  15. Characterization of Cohesion, Adhesion and Creep-Properties of Dynamically Loaded Coatings through the Impact Tester
  16. Peculiarities of Diffusion Controlled Phase Formation in the Al–Co System
  17. Mitteilungen/Notifications
  18. Personen
  19. Bücher/Books
  20. Tagungen
https://doi.org/10.3139/ijmr-2001-0212
Keywords for this article
Nd-Si-Al-O-N system; Subsolidus phase relationships; Silicon nitride; β-sialon

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Dieter Neuschütz 65 Years
  4. Aufsätze/Articles
  5. Combinatorial Methods for Advanced Materials Research & Development
  6. Chemische Gasphasenabscheidung von SiC und SiC + Si auf Kohlenstoffsubstraten und ihre chemische Oberflächenmodifizierung
  7. Fabrication and Characterization of Hydrogen Absorption LaNi5 Alloy Films Sputtered on Nickel Substrate
  8. On the Importance of Gas Phase Chemistry in Two CVD Systems: Deposition of Silicon and Diamond
  9. Thermodynamic Prediction of Metastable Coating Structures in PVD Processes
  10. Setting Kinetic Controls for Complex Equilibrium Calculations
  11. Modeling of the Thermochemical Properties of Multicomponent Oxide Melts
  12. Subsolidus Phase Relationships of the β–Sialon Solid Solution in the Oxygen-Rich Part of the Nd–Si–Al–O–N System
  13. Investigation of Microstructure and Chemical Stability in Composites of NiAl Reinforced by Alumina-Silica Fibers
  14. Gesicherte Interpretationen der FTIR-Reflexionsspektren von SiC–CVD-Schichten durch Spektrensimulation
  15. Characterization of Cohesion, Adhesion and Creep-Properties of Dynamically Loaded Coatings through the Impact Tester
  16. Peculiarities of Diffusion Controlled Phase Formation in the Al–Co System
  17. Mitteilungen/Notifications
  18. Personen
  19. Bücher/Books
  20. Tagungen
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