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

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16 ORN L- DWG 85- 4 i 4 18RS HEAT1 NG HOT ZONE I FI BROUS PREFORM RE AC TA N T GASES Figure 4.1. Schematic of the forced-flow thermal-gradient chemical-vapor-infiltration process developed at ORNL.
17 materials and certain ceramic-fiber-reinforced ceramic matrix composites. Densities >90% theoretical and flexure strengths approaching 600 MPa accompanied by large strain to failure and extensive fiber pull-out have been achieved in relatively short processing times (18 to 24 hours).
Page 3: 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
Page 12 and 13: 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 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 64 and 65: I I MATRIX MATRIX Figure 7.1. Schem
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
Page 114:
96 Figure 10.1. SiC-infiltrated Nic
Page 117 and 118:
99 compared with the dimensions acq
Page 119 and 120:
101 Table 10.3. Strength and modulu
Page 121 and 122:
100 ORNL- DWG 87-1 6292 R CVI-I73 7
Page 123 and 124:
BULK FIBER SAMPLE NO. 173: FIBER SU
Page 125 and 126:
107 similar samples show the film o
Page 127 and 128:
Figure 10.7. SEM micrographs showin
Page 129 and 130:
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
Page 135 and 136:
117 A 1 I S N 31 N I I'd I LN 3H 3
Page 137 and 138:
119 n 0 W n 9 v P n w- n v
Page 139 and 140:
121 s m f c I m z - Ir 2 a 0 9 In u
Page 141 and 142:
Figure 10.14. SEM micrographs of in
Page 143 and 144:
J ORNL-DWC 88-6289 z cF u) w I- z O
Page 145 and 146:
127 300 I CVI-480 I I 1 0 R N L-DWG
Page 147 and 148:
io0 I I I I CVI- 172 75 - - 0 z v -
Page 149 and 150:
131 RAL 033021 RAL 033023 Figure 10
Page 151:
133 include: the reaction of boron
Page 154 and 155:
136 that BN coatings react with the
Page 156 and 157:
75 7 ORNL-DWG 87-48234 50 - - c5 z
Page 158 and 159:
140 Table 10.9. Thermochemical eval
Page 160 and 161:
OANL-bwo 88-9025 ORNL-DWG 66-9027 I
Page 162 and 163:
144 uncoated tows were 14 k 2 pm; t
Page 165 and 166:
11. DISCUSSION 11.1 Constituent Pro
Page 167 and 168:
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
Page 187 and 188:
169 rare-earth magnets and coils to
Page 189 and 190:
171 stress fields along the fiber i
Page 191 and 192:
173 11.3.2 Tensile testinp, The use
Page 193 and 194:
17 5 contraction have been ignored,
Page 195:
177 the system, and when the result
Page 198 and 199:
180 reduces fiber strength. The str
Page 200 and 201:
182 15. R. A. J. Sambell, D. H. Bow
Page 202 and 203:
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
Page 215:
APPENDIX B DETAILS OF THE FIBER-SHE
Page 218 and 219:
200 Those for the fiber (primed) ar
Page 220 and 221:
202 89-92. 93. 94. 95" 96. 97. 98-9
Page 222 and 223:
204 130-133. E. I. DUPONT DE NEMOUR
Page 224 and 225:
206 173. NATIONAL ACADEMY OF SCIENC
Page 226 and 227:
208 203 - 204. 20s. 206 - 207. 208.
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Characterization and control of the fiber-matrix interface in ceramic ...

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