Determination of residual stresses in SiC monofilament reinforced metal-matrix composites using Raman spectroscopy

Ward, Yanling; Young, Robert J.; Shatwell, R.A.

doi:10.1016/s1359-835x(02)00157-4

Cited by 26 publications

(9 citation statements)

References 18 publications

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“…[38] Thus, we put forward biaxial stress approximation with σ z =0. In backscattering geometry (incident and scattering light along z axis), considering axis-symmetrical character of the fiber cross sections, we suggest σ x =σ y , τ xy =τ xz =τ yz =0.…”

Section: Crystalline Siliconmentioning

confidence: 99%

“…Raman spectroscopy has been applied successfully to characterize SiC crystal polytypes, polymer fibers, polymeric precursor SiC fiber, CVD SiC fiber, as well as residual stress in ceramic matrix composites and TMCs . Previous studies on thermal residual stresses of CVD SiC fiber in a matrix used the deformation of carbon coating as calibration, which can only obtain average stress in axial direction of the fibers. The complicated microstructure of CVD SiC fibers contributes to excellent performance, while it also leads to complicated thermal residual stresses inside the fibers.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and thermal residual stress analysis of SiC fiber through Raman spectroscopy

Zhang

Yang

Jin

et al. 2013

J Raman Spectroscopy

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SiC fiber-reinforced metal matrix composite is an interesting material for aerospace industry because of its excellent properties. However, these properties are greatly influenced by fiber microstructure and thermal residual stresses introduced by the preparation of the composites. Due to complicated preparation technology, microstructure and thermal stress along SiC fiber radius varies, which makes characterization difficult. Raman spectroscopy is a non-destructive technique which provides information, at micrometer scale, on the phase composition and the crystalline state (structure and texture) of materials. Line scanning was used to assess microstructure along SiC fiber radius embedded in Ti64. The SiC coating is subdivided into three concentric parts across the fiber diameter, according to the differences in intensity and width of SiC transverse optical phonon (TO) band. Part 2 is considered to be a buffer zone connecting Part 1 and Part 3 with different deposition conditions, respectively. Amorphous Si is detected throughout fiber radius, while crystalline Si is only detected in the outer part. Thermal residual stress along fiber radius in the composite was calculated by using SiC TO band shifts with a bare fiber as reference. A cylindrical model was also used to compare with the stress data obtained from Raman shift.

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Section: Crystalline Siliconmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and thermal residual stress analysis of SiC fiber through Raman spectroscopy

Zhang

Yang

Jin

et al. 2013

J Raman Spectroscopy

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“…1). In SiC fibre, it is reported that SiC nano-crystals with the grain sizes of 1 to 3 nm are embedded in a continuum of SiO x C y (x + y = 4) amorphous phase [9] and thus would be less robust against chemical contamination as compared to SiC monofilament fibres [10].…”

Section: Methodsmentioning

confidence: 99%

Microstructure and oxidation behaviour of SiC fibre-reinforced Si3N4-AlN-Al2O3-Y2O3 matrix composites

Shin¹,

Hong²,

Yoo³

et al. 2004

Composite Interfaces

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A series of SiC fibre-reinforced Si 3 N 4 -AlN-Al 2 O 3 -Y 2 O 3 matrix composites with different matrix compositions are fabricated by slurry infiltration followed by hot pressing at 1600 • C for 30 min. The diffusion of yttrium and aluminium into fibres is apparent during the high temperature processing. All the as-processed composites show fracture with fibre pull-out. After heat treatment in air at 1000 • C for 60 min, composites with minimal Y 2 O 3 and Al 2 O 3 in the matrix composition demonstrate the fracture behaviour with most extensive fibre pull-out. Composites with the highest aluminium and yttrium oxide content form an yttrium-aluminium-garnet phase and an aluminosilicate glassy phase. The latter phase provides an oxygen diffusion path, resulting in the removal of the carbon-rich interphase by oxidation. This results in catastrophic fracture without fibre pull-out after heat treatment of the composite in air.

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“…After milling 40 h graphite, quartz and silicon have been completely amorphous and Fe3Si appeared which resulted from the formation of iron and silicon during the process of collision of grinding balls. It can be seen from Figure 5 that the silicon crystal and silicon carbide crystals were synthesized when the sample after milling 20h was treated under the condition of 2.5GPa, 873K and 2.5GPa,1273K [2][3][4][5][6],respectively (the keeping time of HPHT is 30mins). But the crystallization is not completed which due to the shorter time is kept under the condition of high temperature and high pressure.…”

Section: A the Amorphous And Characterization Of Samples Under High-mentioning

confidence: 99%

Study on the Structure Transition of Graphite and Quartz Doped with Silicon under High Temperature and High Pressure

Wang¹,

Liu²,

Jing³

et al. 2015

Proceedings of the 2nd International Conference on Civil, Materials and Environmental Sciences

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Abstract-A new laboratory method has been suggested for synthesizing coesite in the Earth's crust by considering the similar characteristics of local collisions and shearing strength between the earth's plates and the high-energy mechanical ball milling (MBM),combining the high static pressure and high temperature technique，and using the mixtures of α-quartz and graphite as the initial materials, in which Silicon is mixed by the best quality ratio. The lowest pressure and temperature condition for synthesizing coesite is 3.8GPa and 873K.Keywords-α-quartz-graphite ； Coesite; High temperature and high pressure. I INTRODUCTIONQuartz is a very common natural mineral and can form a number of different variants of the structure under different temperature and pressure conditions. According to the quartz variant the surrounding environment pressure and temperature can be qualitatively estimated in the Geology. Coesite is the UHP variant of the quartz and a kind of effective minerals indicating the pressure. In the nature, graphite and quartz are sometimes born in natural minerals and another kind of UHP variant of the graphite -diamond is the minerals indicating higher pressure. Among the rocks on the earth surface diamond has been found in the form of associated with the coesite or inclusions. To explain the existence of coesite on the earth surface and at the same time to confirm whether or not accompanied by the diamond produced in the process of their formation and the existence of the mutual influence, we used high-energy mechanical ball milling combining the high static pressure and high temperature method to simulate the formation mechanism of coesite and diamond in the Earth's surface by considering the similarity of local collisions and shear stress between the earth plate collision and the high-energy mechanical ball milling (MBM).We concluded that the longer the milling time, the smaller the sample size, the better the effect of amorphous and the easier the synthesis of coesite and diamond. However, the amorphous of graphite is one of the difficulties in the work. Graphite and α-quartz mixed powder can be close to completely amorphous after milling 120h. According to the literature [1] reported that graphite amorphous time can be greatly shortened by adding silicon in graphite and α-quartz mixtures, the time of the best quality is the ratio of Si: C: SiO 2 = 65:14:21. So in order to improve the amorphous graphite, Silicon is joined into the α-quartz powder mixed with graphite. While the silicon content in the earth ranks second and the 65% of the silicon in such mixtures enables the ratio of silicon and carbon to be closer to the real situation in the Earth's interior and to simulate changes of the structure of the material in the Earth realistically. This can provide experimental basis for the research on the mineralization condition of coesite in the Earth surface and Ultra High-pressure (UHP) metamorphism and artificial simulation of the symbiotic of diamond and coesite under higher pressure. II EXPERIMEN...

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Determination of residual stresses in SiC monofilament reinforced metal-matrix composites using Raman spectroscopy

Cited by 26 publications

References 18 publications

Microstructure and thermal residual stress analysis of SiC fiber through Raman spectroscopy

Microstructure and thermal residual stress analysis of SiC fiber through Raman spectroscopy

Microstructure and oxidation behaviour of SiC fibre-reinforced Si3N4-AlN-Al2O3-Y2O3 matrix composites

Study on the Structure Transition of Graphite and Quartz Doped with Silicon under High Temperature and High Pressure

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