Characterization and control of the fiber-matrix interface in ceramic ...

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I I MATRIX MATRIX Figure 7.1. Schematic of indentation method for measurement of fiber-matrix frictional stress. Source: D. B. Marshall, “An Indentation Method for Measuring Matrix-Fiber Frictional Stresses in Ceramic Components,” Comm. her. Ceram. Snc. C259-60 (December 1984),
47 F - 2nRtr , where r is the frictional stress, t is the thickness of the sample parallel to the direction of the fibers, and R is the fiber radius. This relationship holds for thin specimens in which the thickness of the sample is less than the sliding distance of the fiber. The fiber will thus simply be pushed out of the opposite surface when a load is applied, The analysis becomes much more complex if the thickness of the specimen is larger than the sliding distance; however, it can be approximated that the given relationship can be applied to thicker specimens if the thickness of the specimen is much greater than the sliding distance. The frictional stress can then be calculated from the displacement of the Fiber u, resulting from the load imposed by the diamond indentor. The frictional stress is where Ef is the Young's modulus of the fiber and u is the fiber displacement. The value of u can be determined from the indent impression dimensions a and b and the indentor angle 295 as shown in Figure 7.1, u - (b - a) cot $ . The force F supported by the fiber can be obtained from calculating the hardness impressions on the fiber ,
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ORNL/TM-11039 Metals and Ceramics D
Page 6 and 7:
Page 9.3 Composite Fabrication . .
Page 9:
LIST OF TABLES Table Page 5,l. Prop
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Figure 8.3. 9.1.. 9.2. 9.3. 9.4. 9.
Page 14 and 15: Figure 10.18. 10.19. 10.20. 10. 21.
Page 17 and 18: ACKNOWLEDGMENTS The author wishes t
Page 19 and 20: CWCTERIZATION AND CONTROL OF THE FI
Page 21: 1. INTRODUCTION During the last sev
Page 24 and 25: The development of low-density, hig
Page 27 and 28: 3. FABRICATION TECHNIQUES 3.1 Intro
Page 29 and 30: 11 isostatic pressing (HIP), can be
Page 31: 13 utilizing the comparatively low-
Page 34 and 35: 16 ORN L- DWG 85- 4 i 4 18RS HEAT1
Page 37 and 38: 5. COMPOSITE DESIGN 5.1 Introductio
Page 39 and 40: 21 5,2 Mechanical Considerations Th
Page 41 and 42: 23 GRNL-DWG 88-74 26 Figure 5.1. Th
Page 43 and 44: 25 Equation (6) shows that the stre
Page 45 and 46: 27 of reinforcement. There are two
Page 47 and 48: 29 in strength. Conversely, the fib
Page 49 and 50: -I_- Table 5.2. Thermally induced a
Page 51 and 52: 33 1.2 ID 0.8 ;.r 1 e fi v 0.6 a4 Q
Page 53: 35 will affect the interface and, t
Page 56 and 57: 38 fiber-matrix bonding; thus, a fu
Page 58 and 59: 40 In the analysis of the mechanica
Page 60 and 61: 42 1.2 I .o .6 - E f aa '3 0.6 cn 3
Page 62 and 63: 44 will result in the matrix being
Page 66 and 67: 48 F = 2a2H, where H is the hardnes
Page 68 and 69: 50 OWL-PHOTO 6866-86 i d c I 20pm F
Page 70 and 71: 52 where Af is the surface area of
Page 72 and 73: 54 Figure 7.4. Tensile and shear st
Page 74 and 75: 56 I I I / -c rc -c / . Om / / I /
Page 76 and 77: 58 ORNL-OWG 87-i 8234 F Figure 7.7.
Page 78 and 79: coating and the distribution of she
Page 80 and 81: 62 O m PHOTO 6676-87 i SIC FIBERS -
Page 83 and 84: the composite, therefore an interme
Page 85 and 86: methane as the reactant and is, thu
Page 87 and 88: 9. EXPERIMENTAL PROCEDURES 9.1 Depo
Page 89 and 90: 71 furnace. The furnace is, therefo
Page 91 and 92: 73 further protection. A 6.5-cm-dia
Page 94 and 95: 76 of the specimen slowly decreased
Page 96 and 97: 78 The programmer is also equipped
Page 98 and 99: 80 graphite holders through multipl
Page 100 and 101: 82 temperature by simply switching
Page 102 and 103: 84 ORNk DWG 87- 4494 3 METAL LOGR A
Page 104 and 105: 86 9.5 Fracture Surface Analvsis Th
Page 106 and 107: 88 treated and untreated halves wer
Page 108 and 109: 90 9.8.2 Tensile testinq In an init
Page 110 and 111: 92 ORNL-DUG 85-11767R.2 ? ! 2 f CEN
Page 112 and 113: 94 fracture of individual Nicalon f
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96 Figure 10.1. SiC-infiltrated Nic
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99 compared with the dimensions acq
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101 Table 10.3. Strength and modulu
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100 ORNL- DWG 87-1 6292 R CVI-I73 7
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BULK FIBER SAMPLE NO. 173: FIBER SU
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107 similar samples show the film o
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Figure 10.7. SEM micrographs showin
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111 Table 10.4. Thermochemical eval
Page 131 and 132:
100 ORNL-DUG 87-15969R CVI- 170 75
Page 133 and 134:
115 Analysis conversion of of the m
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117 A 1 I S N 31 N I I'd I LN 3H 3
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119 n 0 W n 9 v P n w- n v
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121 s m f c I m z - Ir 2 a 0 9 In u
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Figure 10.14. SEM micrographs of in
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J ORNL-DWC 88-6289 z cF u) w I- z O
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127 300 I CVI-480 I I 1 0 R N L-DWG
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io0 I I I I CVI- 172 75 - - 0 z v -
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131 RAL 033021 RAL 033023 Figure 10
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133 include: the reaction of boron
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136 that BN coatings react with the
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75 7 ORNL-DWG 87-48234 50 - - c5 z
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140 Table 10.9. Thermochemical eval
Page 160 and 161:
OANL-bwo 88-9025 ORNL-DWG 66-9027 I
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144 uncoated tows were 14 k 2 pm; t
Page 165 and 166:
11. DISCUSSION 11.1 Constituent Pro
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149 The properties of CVD Sic have
Page 169 and 170:
151 11.2.1 Matrix cracking In the N
Page 171 and 172:
153 OWL-DWG 88-10677 CVI- (78 22 I
Page 173 and 174:
155 Table 11.3. Property comparison
Page 175 and 176:
157 a f ““f f- L c I Figure 11.
Page 177 and 178:
159
Page 179 and 180:
161 The equations demonstrate that
Page 181 and 182:
163 calculations of the matrix depo
Page 183 and 184:
165 In four of the samples, the fib
Page 185 and 186:
167 Table 11.4. Properties of glass
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169 rare-earth magnets and coils to
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171 stress fields along the fiber i
Page 191 and 192:
173 11.3.2 Tensile testinp, The use
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17 5 contraction have been ignored,
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177 the system, and when the result
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180 reduces fiber strength. The str
Page 200 and 201:
182 15. R. A. J. Sambell, D. H. Bow
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184 41. A. J. Caputo et al., "Fiber
Page 204 and 205:
186 71, N. F. DOW, Study of Stresse
Page 206 and 207:
188 98. M. H. Rawlins et al., "Inte
Page 208 and 209:
190 125. R. Warren and C-H. Anderss
Page 210 and 211:
192 155. M. F. Doerner and W, D. Ni
Page 213 and 214:
APPENDIX A. AUGER ELECTRON SPECTROS
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APPENDIX B DETAILS OF THE FIBER-SHE
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200 Those for the fiber (primed) ar
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202 89-92. 93. 94. 95" 96. 97. 98-9
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204 130-133. E. I. DUPONT DE NEMOUR
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206 173. NATIONAL ACADEMY OF SCIENC
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208 203 - 204. 20s. 206 - 207. 208.
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