DESIGN, ASSEMBLY AND CHARACTERIZATION OF COMPOSITE ...

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Selective laser sintering (SLS) uses a high power CO2 or YAG laser to fuse small particles layer-by-layer into 3D object. 2 As illustrated in Figure 2.7, a thin layer of powdered material is spread across a build platform where the laser selectively fuses the powdered material by tracing a cross-section pattern of the part. The platform then descends by one layer thickness and a new layer of material is applied on top, and the next cross-section is sintered to bond to the previous. This process continues until the part is completed. Figure 2.7 Schematic of the selective laser sintering process (custompartnet.com). 16
Laser Engineered Net Shaping (LENS) 3 is a technology developed by Sandia National Laboratories. As illustrated in Figure 2.8, a high power laser travels through the center of a deposition head and is focused to a small spot by one or more lenses. Powdered material supplied coaxially to the focus is melted by the laser beam. The X-Y table is moved in raster fashion to fabricate each layer of the object. As each layer is completed, the deposition head moves up vertically by one layer thickness relative to the X-Y table to let the structure evolve. Figure 2.8 Schematic of the laser engineered net shaping (custompartnet.com). 17
Page 1 and 2: DESIGN, ASSEMBLY AND CHARACTERIZATI
Page 3 and 4: ACKNOWLEDGEMENTS First and foremost
Page 5 and 6: CHAPTER 5 BARIUM TITANATE NICKEL CO
Page 7 and 8: Table 6.1 Formulations of aqueous c
Page 9 and 10: Figure 2.12 Schematic illustrations
Page 11 and 12: Figure 2.35 Schematic of the SHS pr
Page 13 and 14: Figure 4.9 Sintered nickel lattices
Page 15 and 16: Figure 6.12 Optical image of the cr
Page 17 and 18: 1.1. Motivation CHAPTER 1 INTRODUCT
Page 19 and 20: and characterizing rheological prop
Page 21 and 22: 2.1. Materials System CHAPTER 2 BAC
Page 23 and 24: 2.2. Reentrant Structures and Ceram
Page 25 and 26: devices would provide self-sustaini
Page 27 and 28: a) b) Figure 2.4 Schematic illustra
Page 29 and 30: production of concept models, injec
Page 31: Fused Deposition Modeling (FDM) was
Page 35 and 36: Inkjet printing (IP) 27 is based on
Page 37 and 38: Table 2.1 Comparisons of various SF
Page 39 and 40: Figure 2.11 Processing steps involv
Page 41 and 42: 2.4.1 Colloidal Inks The printing i
Page 43 and 44: Robocasting has lacked a well-desig
Page 45 and 46: Table 2.2 Example polymers that dep
Page 47 and 48: 2.6. Sintering In robocasting, sint
Page 49 and 50: Figure 2.15 Sphere and plate model
Page 51 and 52: where
Page 53 and 54: 2.5.3 Solid State Sintering In this
Page 55 and 56: Figure 2.18 Illustration of neck gr
Page 57 and 58: 2.5.3.4 Final Stage During this sta
Page 59 and 60: Figure 2.23 Schematic diagram of th
Page 61 and 62: 2.5.4.2 Rearrangement With the form
Page 63 and 64: 2.5.4.6 Spreading of Sintering Aid
Page 65 and 66: Driven by reduction of free energy,
Page 67 and 68: 2.5.5 Sintering Atmosphere Sinterin
Page 69 and 70: 2.7. Composite Materials In this re
Page 71 and 72: Figure 2.29 Types of composite mate
Page 73 and 74: Table 2.6 Examples of composite mat
Page 75 and 76: Table 2.7 Examples of FGM applicati
Page 77 and 78: 2.7.3 Processing For the fabricatio
Page 79 and 80: prepared discrete layers of uniform
Page 81 and 82: Powder densification processes gene
Page 83 and 84:
The specific volume fraction beyond
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a) b) Figure 2.34 a) Volume fractio
Page 87 and 88:
When the powders are densified in s
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Various FGM coating processes are a
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of FGMs, such as partially reactive
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leading to a characteristic time τ
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3.1 Introduction CHAPTER 3 AQUEOUS
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occurs in a multi-step process: fir
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a) b) Figure 3.1 a) SEM image of as
Page 101 and 102:
3.2.3 Preparation of Carbon Black C
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3.2.5 Drying Shrinkage Characteriza
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the optimized surfactant concentrat
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The storage modulus of a colloidal
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For HA ink, yield stress
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In the case of the aqueous carbon b
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PPO units of Pluronic F-127 may ads
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a) b) Figure 3.6 A carbon black lat
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a) b) Figure 3.7 SEM images of a) c
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TGA plot is in agreement with previ
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a) b) Figure 3.9 Thermogravimetric
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3.3.8 Fabrication of Complex Cerami
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c) d) 109
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3.4 Conclusion A fugitive support m
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metal inks have been reported for R
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Midland, MI) 5% by weight stock sol
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4.2.5. Thermal Degradation of Binde
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4.3. Results and Discussion 4.3.1.
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4.3.2. Preparation of Nickel Ink Su
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260 °C for 8 hours, the residual c
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Table 4.1 Calculated residual carbo
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a) b) Figure 4.6 Sintered Ni struct
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temperature 138, 139 lead to 92-95%
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Figure 4.8 Scanning electron microg
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c) Figure 4.9 Sintered nickel latti
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5.1. Introduction CHAPTER 5 BARIUM
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materials within the overall struct
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40:60, 60:40, 80:20 are separately
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5.2.3. Rheological Characterization
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5.2.5. Co-sintering and Re-oxidatio
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mixing, BT and Ni phases appear uni
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The combined use of PAA and PAA-90K
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To quantify this difference in sint
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As the BT and Ni particles used in
Page 169 and 170:
The reducing atmosphere used in the
Page 171 and 172:
Figure 5.7 Vickers hardness number
Page 173 and 174:
5.3.6. Fabrication of BT-Ni composi
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modify the sintering kinetics of th
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a) b) Figure 5.10 Co-sintered compo
Page 179 and 180:
5.4. Conclusions Freeform fabricati
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Liquid phase sintering involves usi
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(pH=4.4, 31.5% by weight) (Adva Flo
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concentration of 7 mg/mL in the aqu
Page 187 and 188:
Table 6.1 Formulations of aqueous c
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thickness. Each layer of the struct
Page 191 and 192:
6.2.6. Hardness Test Microindentati
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micrographs for these two powders.
Page 195 and 196:
Second, the added LiAC∙2H2O is am
Page 197 and 198:
Figure 6.3 Oscillatory behavior for
Page 199 and 200:
a) b) Figure 6.4 Sintering strain c
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mass transport in LFBT network. 167
Page 203 and 204:
The above discussion is mainly focu
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Figure 6.8 shows the bowtie-shaped
Page 207 and 208:
Figure 6.10 A NPR composite of para
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etween BT and Ni phases. But Zn ele
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Figure 6.13 Scanning electron micro
Page 213 and 214:
Figure 6.15 shows the mapping of Ti
Page 215 and 216:
Figure 6.17 and Figure 6.18 show el
Page 217 and 218:
Figure 6.19 shows element mapping f
Page 219 and 220:
6.3.7. Piezoelectricity and Dielect
Page 221 and 222:
6.4. Conclusions Aqueous colloidal
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geometric features, including non-s
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3. Development of aqueous colloidal
Page 227 and 228:
7.2. Recommendations In the context
Page 229 and 230:
gelation behavior. κ-carrageenan i
Page 231 and 232:
REFERENCES 1. Larsson 9301647, 1993
Page 233 and 234:
29. Simchi, A.; Petzoldt, F.; Pohl,
Page 235 and 236:
61. Bouvard, D., Acta Metallurgica
Page 237 and 238:
92. Morissette, S. L.; Lewis, J. A.
Page 239 and 240:
120. Boehm, H. P., Some Aspects of
Page 241 and 242:
150. Atkinson, A., Growth of Nio an
Page 243 and 244:
APPENDICES A. Mathematical Modeling
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and
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conditions: Equation A.12 is solved
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and with
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a) b) Figure B.1 a) Freeze-dried st
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a) Figure C.1 Cr-Ni lattices of 5Cr
Page 255 and 256:
E. Binary Phase Diagram of ZnO-B2O3
Page 257 and 258:
References A.1. Du, Z., Sarofim, A.
Page 259:
Name: Jian Xu Date of Degree: May,
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