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Tyranno SA3 fiber–ZrB2 composites. Part I: Microstructure and densification
Graphical abstract Display Omitted
Highlights Densification of ZrB2-composites with 3rd generation SiC short fibers. Microstructure analysis by transmission electron microscopy. Chemical stability of Tyranno SA3 fibers towards sintering aids and ZrB2. Comparison between Tyranno SA3 and Hi-Nicalon fibers.
Abstract ZrB2-ceramics containing 3rd generation SiC short fibers were hot pressed with different kinds of sintering agents in order to obtain an increase of fracture toughness. Several sintering temperatures were explored keeping fixed the amount of fiber to define the most suitable additive able to fully densify ZrB2 with minimal fiber deterioration. In Part I of this article, the microstructure of the composites was examined through scanning electron microscope, to study the distribution of the secondary phases, and transmission electron microscope, to analyse the microstructure at nanoscale level, with particular attention to the evolution of the fiber morphology and to the study of the interfaces with the matrix in high resolution mode. For the first time the chemical stability of Tyranno SA3 fibers towards different sintering additives and ZrB2 is presented. Comparison with Hi-Nicalon fiber is also discussed.
Tyranno SA3 fiber–ZrB2 composites. Part I: Microstructure and densification
Graphical abstract Display Omitted
Highlights Densification of ZrB2-composites with 3rd generation SiC short fibers. Microstructure analysis by transmission electron microscopy. Chemical stability of Tyranno SA3 fibers towards sintering aids and ZrB2. Comparison between Tyranno SA3 and Hi-Nicalon fibers.
Abstract ZrB2-ceramics containing 3rd generation SiC short fibers were hot pressed with different kinds of sintering agents in order to obtain an increase of fracture toughness. Several sintering temperatures were explored keeping fixed the amount of fiber to define the most suitable additive able to fully densify ZrB2 with minimal fiber deterioration. In Part I of this article, the microstructure of the composites was examined through scanning electron microscope, to study the distribution of the secondary phases, and transmission electron microscope, to analyse the microstructure at nanoscale level, with particular attention to the evolution of the fiber morphology and to the study of the interfaces with the matrix in high resolution mode. For the first time the chemical stability of Tyranno SA3 fibers towards different sintering additives and ZrB2 is presented. Comparison with Hi-Nicalon fiber is also discussed.
Tyranno SA3 fiber–ZrB2 composites. Part I: Microstructure and densification
Silvestroni, Laura (author) / Fabbriche, Daniele Dalle (author) / Sciti, Diletta (author)
2014-08-26
11 pages
Article (Journal)
Electronic Resource
English
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