Model ceramic fibre-reinforced glass composites: residual thermal stresses

Yang, Xiuyi; Young, Robert J.

doi:10.1016/0010-4361(94)90174-0

Cited by 37 publications

(19 citation statements)

References 17 publications

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“…Raman spectroscopy was also used by Yang and Young [56] to study thermal residual strains in SiC and alumina fibers (with the addition of 20% (wt.%) partially stabilized tetragonal zirconia) embedded in soda-lime silica or Pyrex glass matrices (these materials are not real glass-ceramics but have similar microstructures). Fibers were sandwiched between two plates of glass and hot-pressed at different temperatures in an argon atmosphere.…”

Section: Residual Stress Measurements Using Raman and Fluorescence Spmentioning

confidence: 99%

Internal residual stresses in glass-ceramics: A review

Serbena

Zanotto

2012

Journal of Non-Crystalline Solids

140

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Section: Residual Stress Measurements Using Raman and Fluorescence Spmentioning

confidence: 99%

Internal residual stresses in glass-ceramics: A review

Serbena

Zanotto

2012

Journal of Non-Crystalline Solids

140

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“…If so, S should eventually be proportional to [50] and others [11,36,39,40,[51][52][53][54][55][56][57][58][59][60][61][62][63][64] ), as a function of E -1/2 .…”

Section: Young's Modulus and "Raman Microextensometry"mentioning

confidence: 99%

Non-destructive mechanical characterization of SiC fibers by Raman spectroscopy

Gouadec

Colomban

2001

Journal of the European Ceramic Society

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The paper provides a comprehensive study on Raman spectroscopy versatility as a fast and non destructive tool for the prediction of the mechanical properties of SiC fibers derived from a polymeric precursor (NLM™, Hi™, Hi-S™, SA™ and Sylramic™ grades) or produced by CVD (SCS-6™ fiber), including in situ analysis in CMCs or MMCs. We show how the results of very simple spectra fitting are correlated with Young's modulus, tensile strength and microhardness. The reason why such a correlation exists, the common dependency of Raman signal and mechanical behavior to the micro/nanostructure of ceramics, is discussed. Keywords :SiC-fibers / Raman spectroscopy / Mechanical properties / Microstructure / Carbon ∂ Author to whom correspondence should be addressed Fax : 33 (0) 1 49 78 13 18 e-mail : colomban@glvt-cnrs.fr IntroductionThe reinforcement of ceramic materials by long ceramic fibers leads to low density and refractory materials, of high damage tolerance, that should be appropriate for metal alloys substitution in advanced engines (turbines) and waste treatment energy plants [1] . Ceramic fibers can also be incorporated directly in metal matrices to increase their high temperature mechanical properties [1] .SiC fibers, which are among the most stable fibers, have always been produced by the 3D reticulation of a polymeric precursor. This synthesis route leads to a high matter homogeneity and very smooth surfaces, the lack of defects explaining tensile strengths σ r as high as 3 GPa. SiC fibers have been widely studied, especially their aging [2][3][4][5][6][7] which evidenced that densification is linked to compositional changes (for instance the loss of some residual hydrogen [8] ). A peculiarity of ceramics issued from polymeric precursors is no impurities are concentrated at the grains boundaries. Abnormal grain growth is very common in the lack of such usual diffusion regulators [9] and the know-how of SiC fibers manufacturers consists in postponing the onset of SiC crystallization and grain growth, since a high correlation is anticipated with mechanical degradation. A close relationship has been evidenced, for instance, between the micro-hardness and short-range ordering in sol-gel prepared nanocrystalline oxides [10] and some authors have already pointed out fibers overall mechanical ability is governed by their microstructure [5,7,11] .The purpose of this paper is to try correlating, to the best extent possible, the tensile strength (σ r ), the Young's modulus (E) and the micro-hardness (μH) of different SiC fibers, either to Raman spectra or to "Raman Extensometry" S coefficient (measuring the straininduced shifts of Raman bands). Unlike most experimental methods intended to measure directly σ r and E, Raman analysis does not require extracting fibers from the matrix, either by mechanical grinding/crushing [12] or by chemical attack [13] . Only the most resistant fibers are extracted in the former case while fibers surface might be altered in the latter. Besides, it will always be difficult to extract...

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“…This phenomenon controls the toughness and fracture behaviour of the composite. [49] Studied parameters included fibre volume fraction, [50] interfacial adhesion, [51] loading type [54] and interphase toughness. [12] It is clear that the stress concentration factor (SCF) non-linearly depends on the fibre volume fraction and on the loading (tensile or compressive).…”

Section: Organic Matrix Compositesmentioning

confidence: 99%

“…[42] The cross section analysis then gives a result close to the ªlongitudinalº one. [13] Model ªsingle fibreº NLM TM /Pyrex TM , [48,54,55] NLM TM /SiC, [56] SiC Tyranno TM /glassy matrix, [57] C/C, [58] C Graphil TM /mullite, NLM TM /mullite [13] or Hi-Nicalon TM /mullite, [53] Hi TM (BN/SiC)/celsian and SCS-6 Textron TM /Ti6242 [52] composites were studied.…”

Section: How To Overcome Some Limitations Of the Techniquementioning

confidence: 99%

Analysis of Strain and Stress in Ceramic, Polymer and Metal Matrix Composites by Raman Spectroscopy

Colomban¹

2002

Adv. Eng. Mater.

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Raman scattering is a unique tool providing information on the structure and short‐range order of matter. Stress‐induced Raman shifts can be used to determine the stress/strain in films, fibres, particulate composites and, more generally, in any phase a few microns or more in scale. Quantitative results follow from a wavenumber calibration as a function of tensile strains or pressures applied to reference fibres or crystals. Furthermore, if the material is coloured, (near) resonant Raman scattering occurs, which enhances the scattered light intensity and simplifies the spectra – especially for harmonics – but drastically reduces the analysed volume (in‐depth penetration ∼10–100 nm). This paper discusses the effective and potential advantages/drawbacks of Raman micro‐spectrometry technique. The procedures to improve the sensitivity, the legibility and the reliability will be addressed. Examples will be chosen among (aramid, C, SiC) fibre‐ reinforced ceramic (CMCs), polymer (PMCs) or metal matrix (MMCs) composites.

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Model ceramic fibre-reinforced glass composites: residual thermal stresses

Cited by 37 publications

References 17 publications

Internal residual stresses in glass-ceramics: A review

Internal residual stresses in glass-ceramics: A review

Non-destructive mechanical characterization of SiC fibers by Raman spectroscopy

Analysis of Strain and Stress in Ceramic, Polymer and Metal Matrix Composites by Raman Spectroscopy

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