Developments in Ceramic Materials Research

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42 Z. C. Li, Z. J. Pei and C. Treadwell roughness decreases as the air pressure increases, as shown in Figure 10. The coolant delivery mode does not have significant effects on the cutting force [Li et al., 2005]. Pressure Continuous mode Pressure Intermittent mode Ti me Ti me (a) (b) Figure 7. Two coolant delivery modes (after [Li et al., 2005]). Pressure AO DDP mode Ti me Figure 8. Coolant delivery mode when using AODDP (after [Li et al., 2005]). Surface roughness (μm) 0.5 0.4 0.3 0.2 0.1 0 Continuous mode Intermittent mode Figure 9. Comparison of surface roughness between different coolant delivery modes (after [Li et al., 2005]).
Recent Advances in Rotary Ultrasonic Machining of Ceramics 43 Surface roughness (μm) 0.6 0.5 0.4 0.3 0.2 20 40 60 80 Air pressure (psi) Figure 10. Effect of air pressure (in the intermittent coolant delivery mode) on surface roughness (after [Li et al., 2005]). 4. RUM OF SILICON CARBIDE Silicon carbide has superior properties such as high strength at elevated temperatures, resistance to chemical degradation, wear resistance, low density, high stiffness, low coefficient of thermal expansion, and superior creep resistance. The combination of these properties makes them attractive in many engineering applications but difficult to machine into desired geometry and surface quality [Datta et al., 2004; Yin et al., 2004]. Up to 2001, no attempt has been reported to machine silicon carbide by RUM. 4.1. Effects of Process Parameters on Cutting Force The spindle speed has a significant effect on the cutting force when RUM of silicon carbide. The cutting force increases as the spindle speed decreases, as shown in Figure 11(a). The feedrate also has a significant effect on the cutting force. The cutting force increases as the feedrate increases, as shown in Figure 11(b). The ultrasonic vibration power and grit size do not affect the cutting force significantly. Figure 12 shows the interactions effects of process parameters on cutting force in RUM of silicon carbide. The interaction effect between spindle speed and feedrate is significant. As shown in Figure 12(a), at the high level of feedrate, the change of spindle speed causes a larger change in cutting force than at the low level of feedrate. The interaction effect between ultrasonic vibration power and feedrate is significant. As shown in Figure 12(b), at the high level of feedrate, the cutting force increases with the change of vibration power from low level to high level, whereas, at the low level of feedrate, the cutting force decreases with the change of vibration power from low level to high level. The interaction effect between ultrasonic vibration power and grit size are significant. As shown in Figure 12(c), at low level of grit size, the cutting force increases with change of
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DEVELOPMENTS IN CERAMIC MATERIALS R
Page 6 and 7: Copyright © 2007 by Nova Science P
Page 9 and 10: PREFACE Ceramics are refractory, in
Page 11 and 12: Preface ix crystals is discussed. A
Page 13: Preface xi spectra and the directio
Page 16 and 17: 2 Leslie G. Cecil comprehensive dat
Page 18 and 19: 4 Leslie G. Cecil Ringle et al. (19
Page 20 and 21: 6 Leslie G. Cecil The main architec
Page 22 and 23: 8 Leslie G. Cecil can study “the
Page 24 and 25: 10 Leslie G. Cecil Middleton et al.
Page 26 and 27: 12 Leslie G. Cecil The laser ablate
Page 28 and 29: 14 Leslie G. Cecil There are two ge
Page 30 and 31: 16 Leslie G. Cecil distinct recipes
Page 32 and 33: 18 Leslie G. Cecil second group (Fi
Page 34 and 35: 20 Leslie G. Cecil The Vitzil-Orang
Page 36 and 37: 22 Leslie G. Cecil Table 3. Mahalan
Page 38 and 39: 24 Leslie G. Cecil Ixlú and Ch’i
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Page 48 and 49: 34 Leslie G. Cecil Schele, L., Grub
Page 50 and 51: 36 Z. C. Li, Z. J. Pei and C. Tread
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92 T. T. Basiev, V. A. Demidenko, K
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94 T. T. Basiev, V. A. Demidenko, K
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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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The Use of Ceramic Pots in Old Wors
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3.2. Wall-in Positions The Use of C
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IACC ( τ ) = t2 ∫ The Use of Cer
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where σ res is the scattering cros
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D50 0.8 0.7 0.6 0.5 0.4 0.3 The Use
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Definition (D50) 1 0.95 0.9 0.85 0.
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Modeling of Thermal Transport in Ce
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q x = Modeling of Thermal Transport
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212 R. Ramesh, H. Kara, Ron Stevens
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220 ε S 33 R. Ramesh, H. Kara, Ron
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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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