Developments in Ceramic Materials Research

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188 M. A. Sheik accurately model porosity volume fractions and characteristic defect lengths, discussed in section 3.3 and given in Tables 1 and 2. Figure 14. Porosity sub-models along with their respective FE meshes. Figure 15. Flow chart for thermal transport modelling of DLR-XT CMC Material.
Modeling of Thermal Transport in Ceramics Matrix Composites 189 The thermal properties determined using one model is included in subsequent models. It is in this way that the synergy between different classes of porosity is assessed. Figure 15 shows the flow chart for thermal transport modelling of this DLR-XT CMC material using sub-models shown in Figure 14 and incorporating porosity type D, shown in Figure 9. 3.4.1. Thermal Properties Thermal conductivity is one of the driving forces in designing materials for thermal applications. In a material, heat flow is proportional to the temperature gradient with the constant of proportionality being the thermal conductivity. Its general form is q = − k i ij d T d x j where qi is the heat flux and kij is the thermal conductivity. This is a second-order tensor and in most cases a symmetric one. Another important parameter for controlling thermal transport is thermal diffusivity α . It is defined as the ratio of a material’s capacity to conduct heat versus its capacity to store it. It is related to thermal conductivity k , specific heat C p and density ρ as: k = α ρ C (10) p Relevant thermal properties of CMC constituents, shown in Table 3, along with air for the pores or cracks are employed for the thermal transport models. Table 3. Standard thermal property values of constituent materials Material k (W m -1 K -1 ) ρ (kg m -3 ) C p (x10 -6 )(J kg -1 K -1 ) Carbon Fibre Transverse 4 1928 921 Carbon Fibre Longitudinal 40 1928 921 Carbon Matrix 10 1800 717 SiC Matrix 70 3200 1422 Air 0.001 1 1 Finite-element methods for determining the thermal transport properties of solids are based on the two thermal analyses; Steady State and Transient. The steady state thermal (9)
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DEVELOPMENTS IN CERAMIC MATERIALS R
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Copyright © 2007 by Nova Science P
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PREFACE Ceramics are refractory, in
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Preface ix crystals is discussed. A
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Preface xi spectra and the directio
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2 Leslie G. Cecil comprehensive dat
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4 Leslie G. Cecil Ringle et al. (19
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6 Leslie G. Cecil The main architec
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8 Leslie G. Cecil can study “the
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10 Leslie G. Cecil Middleton et al.
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12 Leslie G. Cecil The laser ablate
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14 Leslie G. Cecil There are two ge
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16 Leslie G. Cecil distinct recipes
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18 Leslie G. Cecil second group (Fi
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20 Leslie G. Cecil The Vitzil-Orang
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22 Leslie G. Cecil Table 3. Mahalan
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24 Leslie G. Cecil Ixlú and Ch’i
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26 Leslie G. Cecil structures (D. R
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28 Leslie G. Cecil paste and Macanc
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30 Leslie G. Cecil Bieber, A. M. Jr
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32 Leslie G. Cecil Kepecs, S. M., a
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34 Leslie G. Cecil Schele, L., Grub
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36 Z. C. Li, Z. J. Pei and C. Tread
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54 T. T. Basiev, V. A. Demidenko, K
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62 I, % 100 80 60 40 20 0 T. T. Bas
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68 Fluorescence, a.u. 1 T. T. Basie
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70 Fluorescence, a.u. 1 0.1 0.01 0.
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78 k, cm -1 20 18 16 14 12 10 8 6 4
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82 Photon counts 300 250 200 150 10
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84 Fluorescence, a.u. I transfer ,
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86 ln(I transfer (t)) -4.2 -4.4 -4.
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88 Fluorescence, a.u. I transfer ,
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In: Developments in Ceramic Materia
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Synthesis, Spectroscopic and Magnet
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a c Synthesis, Spectroscopic and Ma
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Transmission Transmission Transmiss
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Sm (J/Kmol) Sm (J/Kmol) 15 10 5 Syn
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Intensity (a.u.) Intensity (a.u.) 8
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238 R. Ramesh, H. Kara, Ron Stevens
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240 R. Ramesh, H. Kara, Ron Stevens
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242 Development of Display Technolo
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244 Li Chen technology moved to the
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246 Li Chen The continuing evolutio
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248 Li Chen the back contact cathod
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250 Li Chen Figure 3. Vertical side
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252 Li Chen Figure 6. Molybdenum mi
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254 Li Chen Figure 8(a). I-V curve
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256 Li Chen Figure 9. Life time tes
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258 Figure 11(a). Plasma generated
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260 Li Chen [13] C.A. Spindt, K.R.
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262 S. Ardizzone, C. L. Bianchi, G.
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A absorption spectra, 66, 67, 77, 7
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correlation function, 156 corrosion
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group membership, 13, 20, 21, 22, 2
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microstructure(s), x, xi, 73, 74, 2
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efraction index, 61 refractive inde
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time, vii, ix, 1, 3, 7, 8, 11, 26,
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Developments in Ceramic Materials Research

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