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

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200 Those for the fiber (primed) are given as - e'rz - € 'ez - 0 ; where p = [1/(vm - vf)][a2(1 - 2vm)(l - Km/Kf) and K - E/(1 + v)(l - 2~). + b2(1 + (1 - 2Ym)(1 - KJK,)] The variables are as given in previous equations, and the directions of the stress vectors are shown in Figure 7.7. These expressions show that the stresses and strains in the fiber and matrix (sheath) are dependent on the diameter of the fiber, the thickness of the coating, and the Poisson ratios of the components. The Poisson ratio for ceramic materials is small, and from the preceding relationships, it can be seen that if Y is relatively small and the coating is thin (b = a), then the radial and tangential forces resulting from an applied stress or strain will be insignificant in ceramic-ceramic systems.
QRNL/TM-11039 INTERNAL DISTRIBUTION 1-2" 3. 4-5. 6. 7. 8-10. 11, 12. 13 ~ 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33 * 34. Central Research Library 35, D. R. Johnson Document Reference Secfion 36. R. R. Judkins Laboratory Records Department 37. H. E. Kim Laboratory Records, ORNL RC 38. 0. F. Kimball ORNL Patent Section 39. E. L. Long, Jr. M&C Records Office 40-59. R. A. Lowden K. B. Alexander L. F. Allard R. L. Beatty P. F. Becher J. Bentley T. M. Besmann P. J. Blau A. Bleier R. A. Bradley D. N. Braski P. T. Carlson R. H. Cooper, Jr. D. F. Craig J. H. DeVan C. E. DeVore J. I. Federer E. L. Fuller, Jr. E. P. George F. M. Haggag J. A. Horak J. A. Horton G. C.-H. Hsueh C. R. Hubbard M. G. Jenkins 60 K. L. More 61, T. A. Nolan 62. 0. 0. Omatete 63. R. A. Padgett, Jr. 64. P. L. Rittenhouse 65. A. C. Schaffhauser 66, M. A. Schmidt 67. B. W. Sheldon 68. D. P. Stinton 69. V. J. Tennery 70. T. N. Tiegs 71. P. F. Tortorelli 72. J. M. Vitek 73. J. R. Weir 74. F. W. Wiffen 75. D. F. Wilson 76. A. C. Young 77. S. J. Zinkle 78. A. D. Brailsford (Consultant) 79. H. D, Brody (Consultant) 80. F. F. Lange (Consultant) 81. D. P. Pope (Consultant) 82. E. R. Thompson (Consultant) 83. J. €5, Wachtman (Consultant) EXTERNAL DISTRIBUTION 84. 85. 86-88. ACUREX CORPORATION, 555 Clyde Avenue, P.O. Box 7555, Mountain View, CA 94039 J. Sawyer ADIABATICS, INCORPORATED, 6 3 S. ~ Mapleton, Columbus, IN 47201 Roy Kamo, President AFWAL/MLLM, Wright-Patterson AFB, OH 45433 Alan Katz L. Matson S . Szaruga 201
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ORNL/TM-11039 Metals and Ceramics D
Page 6 and 7:
Page 9.3 Composite Fabrication . .
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LIST OF TABLES Table Page 5,l. Prop
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Figure 8.3. 9.1.. 9.2. 9.3. 9.4. 9.
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Figure 10.18. 10.19. 10.20. 10. 21.
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ACKNOWLEDGMENTS The author wishes t
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CWCTERIZATION AND CONTROL OF THE FI
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1. INTRODUCTION During the last sev
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The development of low-density, hig
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3. FABRICATION TECHNIQUES 3.1 Intro
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11 isostatic pressing (HIP), can be
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13 utilizing the comparatively low-
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16 ORN L- DWG 85- 4 i 4 18RS HEAT1
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5. COMPOSITE DESIGN 5.1 Introductio
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21 5,2 Mechanical Considerations Th
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23 GRNL-DWG 88-74 26 Figure 5.1. Th
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25 Equation (6) shows that the stre
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27 of reinforcement. There are two
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29 in strength. Conversely, the fib
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-I_- Table 5.2. Thermally induced a
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33 1.2 ID 0.8 ;.r 1 e fi v 0.6 a4 Q
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35 will affect the interface and, t
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38 fiber-matrix bonding; thus, a fu
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40 In the analysis of the mechanica
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42 1.2 I .o .6 - E f aa '3 0.6 cn 3
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44 will result in the matrix being
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I I MATRIX MATRIX Figure 7.1. Schem
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48 F = 2a2H, where H is the hardnes
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50 OWL-PHOTO 6866-86 i d c I 20pm F
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52 where Af is the surface area of
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54 Figure 7.4. Tensile and shear st
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56 I I I / -c rc -c / . Om / / I /
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58 ORNL-OWG 87-i 8234 F Figure 7.7.
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coating and the distribution of she
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62 O m PHOTO 6676-87 i SIC FIBERS -
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the composite, therefore an interme
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methane as the reactant and is, thu
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9. EXPERIMENTAL PROCEDURES 9.1 Depo
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71 furnace. The furnace is, therefo
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73 further protection. A 6.5-cm-dia
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76 of the specimen slowly decreased
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78 The programmer is also equipped
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80 graphite holders through multipl
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82 temperature by simply switching
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84 ORNk DWG 87- 4494 3 METAL LOGR A
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86 9.5 Fracture Surface Analvsis Th
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88 treated and untreated halves wer
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90 9.8.2 Tensile testinq In an init
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92 ORNL-DUG 85-11767R.2 ? ! 2 f CEN
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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
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100 ORNL-DUG 87-15969R CVI- 170 75
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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
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OANL-bwo 88-9025 ORNL-DWG 66-9027 I
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144 uncoated tows were 14 k 2 pm; t
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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 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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