use of metal templates for microcavity formation in alumina

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too. Then the actual of Archimedes density ρ can be calculated from the weight determinations as follows (Equation 2.3): (2.3) where is the density of water in kg/m 3 , which is temperature dependent as given here (Equation 2.4), (2.4) with T being the water temperature in o C. Dividing the measured density by the theoretical density gives the fractional density. One variant uses water impregnation instead of oil to fill the pores, which still involves two immersion events, but there is no oil trapped in the pores (German and Park, 1946). In Equation 2.3 and 2.4, T is water temperature, W1 is dry mass of the sample prior to testing, kg, W2 is wet mas of the sample after filling pores with fluid, kg, W3 is mass of the component immersed in water, kg, WW is mass of the suspension wire, kg, W is temperature-corrected density of water, kg/m 3 and ρ is component density, kg/m 3 . 20
CHAPTER 3 EXPERIMENTAL In this chapter, the materials used and the experimental procedure are explained. The thesis is releated to the study of diffusion of titanium wire, titantium plate, copper wire and stainless steel wire into alumina. 3.1. Materials In this thesis, first a variety of high-purity alumina powders made by different manufacturers (CT3000SG, ALCOA, 99,9%) (AKP50, Sumitomo, 99,9%) (CR6, Baikowski, 99,9%) (CR15, Baikowski, 99,9%) (CR30F, Baikowski, 99,9%) were used to prepare the base materials. The smallest sizes (125µm) of pure titanium (Timet, Turkey) and stainless steel wires (Elsan, Turkey) and titanium plate (Timet, Turkey) were used in order to produce micro-tunnels. Figure 3.1 shows photographs of some of the as-received samples. Below are given the properties of the starting powders (Table 3.1). 21
Page 1 and 2: USE OF METAL TEMPLATES FOR MICROCAV
Page 3 and 4: ACKNOWLEDGEMENTS I would like to ex
Page 5 and 6: ÖZET ALÜMİNA İÇİNDE MİKROBO
Page 7 and 8: 4.3.1. Alumina ....................
Page 9 and 10: Figure 3.4. Pressed samples: (a) be
Page 11 and 12: Figure 4.35. Phase equilibrium diag
Page 13 and 14: 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: y the technique of dilatometry (Rah
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 and 66: Wt (%) 50 45 40 35 30 25 20 15 10 5
Page 67 and 68: Wt (%) 70 60 50 40 30 20 10 0 Al (w
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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