Characterization and control of the fiber-matrix interface in ceramic ...
Characterization and control of the fiber-matrix interface in ceramic ...
Characterization and control of the fiber-matrix interface in ceramic ...
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Figure<br />
8.3.<br />
9.1..<br />
9.2.<br />
9.3.<br />
9.4.<br />
9.5.<br />
9.6.<br />
9.7.<br />
9.8<br />
9.9<br />
10.1<br />
10.2<br />
10.3<br />
10.4<br />
Auger depth pr<strong>of</strong>ile <strong>of</strong> <strong>the</strong> surface o.€ Nicalon <strong>fiber</strong>s<br />
heated to 1G75 K <strong>in</strong> argon . . . . . . . . . . . . . . . . .<br />
Details <strong>of</strong> <strong>the</strong> chemical-vapor-<strong>in</strong>filtration furnace for <strong>the</strong><br />
densificacion <strong>of</strong> fibrous preforms usi.ng <strong>the</strong> FCVI process . .<br />
Details <strong>of</strong> <strong>the</strong> water-cooled gas di-stributor . . . . . . . .<br />
Schemati-c <strong>of</strong> <strong>the</strong> <strong>in</strong>filt.ration system . . . . . . . . . . . .<br />
Photograph <strong>of</strong> <strong>in</strong>fi1trat:ion furnace . . . . . . . . . . . . .<br />
Graphite reta<strong>in</strong>er conta<strong>in</strong><strong>in</strong>g pla<strong>in</strong>-weave cloth layers . . .<br />
Location <strong>of</strong> test specimens with<strong>in</strong> <strong>the</strong> composite sample . . .<br />
The features <strong>of</strong> <strong>the</strong> fracture surfaces analyzed us<strong>in</strong>g<br />
Auger spectroscopy: (a> bulk <strong>fiber</strong>, (b) <strong>fiber</strong> surface,<br />
(c) pull-out groove, <strong>and</strong> (d) <strong>matrix</strong> . . . . . . . . . . . .<br />
Photographs oE <strong>the</strong> load<strong>in</strong>g frame <strong>and</strong> fixtures used<br />
?n <strong>the</strong> tensile technique for <strong>the</strong> measurement <strong>of</strong><br />
<strong>in</strong>terfa(-i a1 stresses . . . . . . . . . . . . . . . . . . . .<br />
The gas distributor redesigned to accommodate coat<strong>in</strong>g<br />
<strong>the</strong> center section <strong>of</strong> <strong>the</strong> <strong>fiber</strong>s . . . . . . . . . . . . . .<br />
Sic-<strong>in</strong>filtrated Nicalnn sample before be<strong>in</strong>g removed<br />
from holder . . . . . . . . . . . . . . . . . . . . . . . .<br />
Kcpresentative cross section <strong>of</strong> a sample with an<br />
apparent density <strong>of</strong> 85% <strong>the</strong>oretical. . . . . . . . . . . . .<br />
Load-displacement curves <strong>and</strong> fract-ure surfaces OC<br />
specimens conta<strong>in</strong><strong>in</strong>g Nicalon <strong>fiber</strong>s coated with Sic:<br />
(a) CVI-178, uncoated <strong>fiber</strong>s; (b) CVI-173, Sic from<br />
methylsilane; <strong>and</strong> (c) CVL-176, Sic from methylsilane . . . .<br />
AES analysis <strong>of</strong> fracture surface features for an<br />
Sic composite specimen fabricated from untreated<br />
Nicalon <strong>fiber</strong>s . . . . . . . . . . . . . . . . . . . . . . .<br />
Page<br />
64<br />
70<br />
72<br />
7 h<br />
75<br />
79<br />
84<br />
87<br />
91<br />
92<br />
96<br />
97<br />
102.<br />
105<br />
10.5. AES znalysis <strong>of</strong> fracture surface features for an Sic<br />
composite specimen conta<strong>in</strong><strong>in</strong>g Nicalon <strong>fiber</strong>s coated<br />
with an <strong>in</strong>termediate Sic layer deposited at 1125 K . . . . .<br />
10.6. A th<strong>in</strong>, translucent. layer observed <strong>in</strong> <strong>the</strong> pull-out grooves<br />
<strong>of</strong> fractured composite specimens fabricated from uncoated<br />
Niealon<strong>fiber</strong>s. ......................<br />
106<br />
108<br />
X