Journal ArticleDOI
Fibre-matrix interphases and interfaces in ceramic matrix composites processed by CVI
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TLDR
In this paper, the fiber-matrix interfacial zone plays a key role in the mechanical behaviour of Si-C(O)/SiC inverse composites fabricated by chemical vapour infiltration (CVI) from ex-polycarbosilane Si-c(O) fibres precoated with pyrocarbon or boron nitride.Abstract:
The fibre-matrix (FM) interfacial zone plays a key role in the mechanical behaviour of Si-C(O)/SiC inverse composites fabricated by chemical vapour infiltration (CVI) from ex-polycarbosilane Si-C(O) fibres precoated with pyrocarbon or boron nitride. It consists not only of the C (or BN) main interphase, but also of very thin secondary interphases (i.e. carbon and silica) resulting from the decomposition of the metastable Si-C(O) fibres thought to occur during the fabrication of the fibres and/or the composites. The FM interfacial zone may play two complementary roles: (i) it provides low-energy microcrack propagation paths parallel to the fibre axis, and (ii) it may act as a compliant buffer for the relaxation of the residual thermal compression stresses on the interface. The FM bond strength is low or moderate when a quasi-continuous thin layer of anisotropic carbon is present between the fibre and the main interphase and when the fibre surface remains smooth. The mechanical behaviour in tension is non-b...read more
Citations
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Journal ArticleDOI
The physics and mechanics of fibre-reinforced brittle matrix composites
Anthony G. Evans,Frank W. Zok +1 more
TL;DR: In this paper, a review of the mechanical and structural performance of brittle matrix composites is presented, focusing on the stress/strain behaviour in tension and shear, the ultimate tensile strength and notch sensitivity, fatigue, stress corrosion and creep.
Journal ArticleDOI
The design of the fibre-matrix interfacial zone in ceramic matrix composites
TL;DR: In this article, four types of interphase are depicted involving weak interfaces, materials with a layered crystal structure (pyrocarbon, BN, micas and phyllosiloxides, or materials with the β-alumina/magnetoplumbite structures), multilayers such as (PyC-SiCn or (BN-SiCsn)n or, finally, porous materials.
Journal ArticleDOI
Single-Crystal SiC Nanowires with a Thin Carbon Coating for Stronger and Tougher Ceramic Composites
Wen Yang,Hiroshi Araki,Chengchun Tang,Somsri Thaveethavorn,Akira Kohyama,Hiroshi Suzuki,Tetsuji Noda +6 more
Journal ArticleDOI
Boron-bearing species in ceramic matrix composites for long-term aerospace applications
TL;DR: In this article, a self-healing multilayered matrix is designed and used in a model composite, which combines B-doped pyrocarbon mechanical fuse layers and B 4 C and SiC layers forming B 2 O 3 -based fluid healing phases when exposed to an oxidizing atmosphere.
Journal ArticleDOI
High-Temperature Oxidation of Boron Nitride: II, Boron Nitride Layers in Composites
TL;DR: In this paper, a model for recession of the BN fiber coating was developed based on the gas-phase diffusion of these species out of the annular region around the SiC fiber and concurrent sealing of this annular regions by oxidation.
References
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BookDOI
Boron and Refractory Borides
TL;DR: Theoretical interest in the properties of Boron and its properties can be found in this article, where the electronic structure of the Hexaborides and the Diborides is discussed.
Journal ArticleDOI
Theory of multiple fracture of fibrous composites
J. Aveston,Anthony Kelly +1 more
TL;DR: In this paper, the theoretical stress-strain behavior of a composite with a brittle matrix, in which the fiber-matrix bond remains intact after the matrix has cracked, is described.
Journal ArticleDOI
Overview no. 85 The mechanical behavior of ceramic matrix composites
TL;DR: In this article, the authors summarized the current understanding of relationships between microstructure and mechanical properties in ceramics reinforced with aligned fibers and focused on definition of the micromechanical properties of the interface that govern the composite toughness.
Journal ArticleDOI
Measurement of Interfacial Mechanical Properties in Fiber‐Reinforced Ceramic Composites
TL;DR: In this paper, a methode d'indentation dans laquelle un indenteur pyramidal est utilise for pousser les fibres and provoquer un glissement a l'interface fibre/matrice.
Journal Article
Fiber reinforced glasses and glass-ceramics for high performance applications
TL;DR: In this article, the development of fiber reinforced glass and glass-ceramic matrix composites is described and general concepts involved in composite fabrication and resultant composite properties are given for a broad range of fiber and matrix combinations.