Journal Article10.1007/BF01161167
Relationships between processing, microstructure and properties of dense and reaction-bonded silicon nitride
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TL;DR: In this paper, the relationship between powder properties, process conditions, densification and microstructure, as well as the interdependence between microstructures and properties is discussed.
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Abstract: Some aspects of processing, microstructure and properties of the various types of silicon nitride are discussed. Special emphasis is placed on the relationships between powder properties, process conditions, densification and microstructure, as well as the interdependence between microstructure and properties. After summarizing the areas of crystal structure and thermodynamic properties, and processing of the different types of Si3N4, the state-of-the-art of dense and reaction-bonded silicon nitride is given. For both types the formation mechanisms and microstructure, relationships between powder properties, additives (in the case of dense Si3N4), process conditions, and densification and microstructure, as well as data and microstructural effects of various mechanical, thermal and thermo-mechanical properties, are outlined. Advanced processing techniques, such as sintering, gas-pressure sintering, post-sintering, and the different routes of hot-isostatic pressing (starting with powder compacts, reaction-bonded Si3N4 or pre-sintered Si3N4 and the resulting properties, are discussed.
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References
Densification during Sintering in the Presence of a Liquid Phase. I. Theory
TL;DR: In this paper, the driving force leading to densification during sintering in the presence of a liquid phase and the material transport phenomena have been analyzed and relationships for the densification rate during the rearrangement process, the solution-precipitation process, and the final coalescence process have been determined.
997
Reaction-bonded silicon nitride: its formation and properties
TL;DR: In this paper, a model of reaction-bonded silicon nitride is presented, with emphasis on kinetics and on phase composition and microstructure of the reaction product.
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