A Thermodynamic Model of an Amorphous Grain Boundary Phase in Liquid-Phase Sintered β-SiAlON Ceramic
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Jerzy A. Golczewski
,
Hans J. Seifert
Abstract
Thermodynamic modeling has been developed to explain the apparent stability of an intergranular amorphous phase in the liquid-phase sintered ceramic. The basic postulate has been to consider such a grain boundary phase as a separate phase of the system. An analytic form of the Gibbs energy functions recently derived for amorphous silicates has been taken to describe this boundary phase. A derived equilibrium condition conforming with the construction of parallel tangents to Gibbs energy functions has been used to estimate the compositions of the bulk and of the boundary phase. The microstructure of liquid-phase sintered β-SiAlON ceramic has been ascertained in this way. This model supports the existence of amorphous boundary phases as thermodynamically stable and provides a relation between their amount and the composition of the sinter additives in agreement with the experimental evidence.
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The financial support of the Deutsche Forschung Gemeinschaft is kindly acknowledged. The authors are also indebted to Prof. E. Rudnyi for very helpful discussion and comments.
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© 2001 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Editorial
- “No wise man ever wish to be younger”
- Aufsätze/Articles
- Entropy, Transformations and Sustainability of Industrial Life Cycles
- Positron Annihilation in Stable and Supercooled Metallic Melts
- Local Characterization of the Diffusion Process during Discontinuous Precipitation: A Review
- The Dependence of Abnormal Grain Growth on Initial Grain Size in 316 L Stainless Steel
- Diffusion-Controlled Grain Growth in Liquid-Phase Sintering of W–Cu Nanocomposites
- Evaluation of Densification Mechanisms of Liquid-Phase Sintering
- Phase Transformation of a Dual Phase Al–Fe Alloy Prepared by Mechanical Alloying
- Discrete Element Simulation of Ceramic Powder Processing
- Strain Relaxation and Internal Friction in the Range of the Glass Transition
- A Thermodynamic Model of an Amorphous Grain Boundary Phase in Liquid-Phase Sintered β-SiAlON Ceramic
- Epitaxial Growth of Metals on (100) SrTiO3: The Influence of Lattice Mismatch and Reactivity
- Microstructure and Modifications of Cu/Al2O3 Interfaces
- Structural Transformations Induced by Swift Heavy Ions in Polysiloxanes and Polycarbosilanes
- Metastable Al–Nd–Ni and Stable Al–La–Ni Phase Equilibria
- Phase Equilibria of the Al–Nd and Al–Nd–Ni Systems
- System Pr –Pd–O: Phase Diagram and Thermodynamic Properties of Ternary Oxides Using Solid-State Cells with Special Features
- Calculation of Phase Equilibria in Candidate Solder Alloys
- Thermodynamic Assessment of the Zr–O Binary System
- Delaminating Layered Oxide Composites with Wavy Interfaces
- Contemporary Materials Issues for Advanced EB-PVD Thermal Barrier Coating Systems
- Monte Carlo Simulations of Strength Distributions of Brittle Materials – Type of Distribution, Specimen and Sample Size
- On the Optimization of the Microstructure in Powder Metallurgical Ag–SnO2–In2O3 Contact Materials
- Some New Aspects of Microstructural Design of β-Si3N4 Ceramics
- Ni-Based SOFC Anodes: Microstructure and Electrochemistry
- Effect of Copper Line Geometry and Process Parameters on Interconnect Microstructure and Degradation Processes
- Thermal Stability of Nanoscale Co/Cu Multilayers
- Methods for Characterising the Precipitation of Nanometer-Sized Secondary Hardening Carbides and Related Effects in Tool Steels
- Prediction of Local Strain and Hardness in Sheet Forming
- Novel in situ-Infiltrated Al2O3-Metal Composites
- Influence of Microstructure and Impurities on Thermal Conductivity of Aluminium Nitride Ceramics
- Notifications/Mitteilungen
- Personelles/Personal
- Bücher/Books
- Tagungen/Conferences
Articles in the same Issue
- Frontmatter
- Editorial
- “No wise man ever wish to be younger”
- Aufsätze/Articles
- Entropy, Transformations and Sustainability of Industrial Life Cycles
- Positron Annihilation in Stable and Supercooled Metallic Melts
- Local Characterization of the Diffusion Process during Discontinuous Precipitation: A Review
- The Dependence of Abnormal Grain Growth on Initial Grain Size in 316 L Stainless Steel
- Diffusion-Controlled Grain Growth in Liquid-Phase Sintering of W–Cu Nanocomposites
- Evaluation of Densification Mechanisms of Liquid-Phase Sintering
- Phase Transformation of a Dual Phase Al–Fe Alloy Prepared by Mechanical Alloying
- Discrete Element Simulation of Ceramic Powder Processing
- Strain Relaxation and Internal Friction in the Range of the Glass Transition
- A Thermodynamic Model of an Amorphous Grain Boundary Phase in Liquid-Phase Sintered β-SiAlON Ceramic
- Epitaxial Growth of Metals on (100) SrTiO3: The Influence of Lattice Mismatch and Reactivity
- Microstructure and Modifications of Cu/Al2O3 Interfaces
- Structural Transformations Induced by Swift Heavy Ions in Polysiloxanes and Polycarbosilanes
- Metastable Al–Nd–Ni and Stable Al–La–Ni Phase Equilibria
- Phase Equilibria of the Al–Nd and Al–Nd–Ni Systems
- System Pr –Pd–O: Phase Diagram and Thermodynamic Properties of Ternary Oxides Using Solid-State Cells with Special Features
- Calculation of Phase Equilibria in Candidate Solder Alloys
- Thermodynamic Assessment of the Zr–O Binary System
- Delaminating Layered Oxide Composites with Wavy Interfaces
- Contemporary Materials Issues for Advanced EB-PVD Thermal Barrier Coating Systems
- Monte Carlo Simulations of Strength Distributions of Brittle Materials – Type of Distribution, Specimen and Sample Size
- On the Optimization of the Microstructure in Powder Metallurgical Ag–SnO2–In2O3 Contact Materials
- Some New Aspects of Microstructural Design of β-Si3N4 Ceramics
- Ni-Based SOFC Anodes: Microstructure and Electrochemistry
- Effect of Copper Line Geometry and Process Parameters on Interconnect Microstructure and Degradation Processes
- Thermal Stability of Nanoscale Co/Cu Multilayers
- Methods for Characterising the Precipitation of Nanometer-Sized Secondary Hardening Carbides and Related Effects in Tool Steels
- Prediction of Local Strain and Hardness in Sheet Forming
- Novel in situ-Infiltrated Al2O3-Metal Composites
- Influence of Microstructure and Impurities on Thermal Conductivity of Aluminium Nitride Ceramics
- Notifications/Mitteilungen
- Personelles/Personal
- Bücher/Books
- Tagungen/Conferences
