use of metal templates for microcavity formation in alumina

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Figure 4.35 shows the phase equilibrium diagram of CuO- Al2O3 system. There are several preliminary observations to be made on this diagram. At low temperatures, no Cu2O is formed, only CuO, which does not react with Al2O3. At around 800°C, Cu(AlO2)2= CuAl2O4 begins to be formed in this reported narrow 800-900°C. CuAlO2 is reported to be stable for all temperatures between 900°C and 1260°C, and also in equilibrium with CuO or Al2O3 when unbalanced. At 1350 o C, copper has been almost completely liquid phase. Figure 4.35. Phase equilibrium diagram of CuO - Al2O3 system (Source: Misra et al.,1963). Figure 4.36 shows EDS analysis of the sample CR30F-Cu. According to EDS results of the sample, Al and O are stable while we cannot see much Cu. Copper is considered to be in liquid phase at 1350 o C. It is possible to melt out during heating and only a minor fraction remained in alumina which was sufficient enough to impart some color in the otherwise white alumina ceramic. 54
Wt (%) 70 60 50 40 30 20 10 0 Al (wt%) O (wt%) Cu (wt%) 0 20 40 60 80 100 120 140 Distance (µm) Figure 4.36. EDS line analysis of the sample CR30F-Cu. Because copper is in the liquid phase at 1350 o C, the experiment is repeated at 1000 o C. Copper diffusion into alumina at 1000 o C is shown in Figure 4.37. Copper wire diffused from exactly the centre of itself into alumina. Figure 4.37. SEM micrographs of alumina CR30F that contained copper wire. 55
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USE OF METAL TEMPLATES FOR MICROCAV
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ACKNOWLEDGEMENTS I would like to ex
Page 5 and 6:
ÖZET ALÜMİNA İÇİNDE MİKROBO
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4.3.1. Alumina ....................
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Figure 3.4. Pressed samples: (a) be
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Figure 4.35. Phase equilibrium diag
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CHAPTER 1 INTRODUCTION Porous oxide
Page 15 and 16: 2.1. Porous Materials CHAPTER 2 LIT
Page 17 and 18: Alumina ceramic is one of the most
Page 19 and 20: 2.3. Properties and Applications of
Page 21 and 22: Selection of stainless steels based
Page 23 and 24: Some physical properties of copper
Page 25 and 26: of some of the oxygen from the air
Page 27 and 28: not occupied by the flow of Cu from
Page 29 and 30: During the 4 hours soaking time at
Page 31 and 32: y the technique of dilatometry (Rah
Page 33 and 34: CHAPTER 3 EXPERIMENTAL In this chap
Page 35 and 36: Table 3.1. Properties of alumina po
Page 37 and 38: 3.2.1. Co-Pressing with Single-acti
Page 39 and 40: 3.3. Density Measurements The final
Page 41 and 42: Figures 4.3 and 4.4 show relative d
Page 43 and 44: Densification Rate (1/ o C) 0,005 0
Page 45 and 46: Densification Rate (1/ o C) 0,009 0
Page 47 and 48: (a) (b) (c) (d) (e) Figure 4.8. SEM
Page 49 and 50: Figure 4.10. EDS analysis of the Ti
Page 51 and 52: 4.3.3. Ti Diffusion into Alumina In
Page 53 and 54: Titanium advanced through alumina a
Page 55 and 56: Wt (%) Wt (%) 100 80 60 40 20 0 100
Page 57 and 58: Figure 4.22. EDS line analysis of t
Page 59 and 60: Densification Rate (1/ o C) 0,0069
Page 61 and 62: Figure 4.27, 28 and 29 belong to ED
Page 63 and 64: 4.3.5. Stainless Steel Diffusion in
Page 65: Wt (%) 50 45 40 35 30 25 20 15 10 5
Page 69 and 70: 4.3.7. Results of Sintering of Alum
Page 71 and 72: Wt (%) 40 35 30 25 20 15 10 5 0 Al
Page 73 and 74: CHAPTER 5 CONCLUSIONS Densification
Page 75 and 76: REFERENCES Alcoa, Inc., 2010, Alumi
Page 77 and 78: Isobe, T., Tomital, T., Kameshima,
Page 79: Yalamaç, E., 2010, Sintering, Co-S
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