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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-I_-<br />
Table 5.2. Thermally <strong>in</strong>duced axial stress (<strong>in</strong> MPa) <strong>in</strong> <strong>the</strong> <strong>matrix</strong> upon cool<strong>in</strong>g<br />
from 1275 K to room temperature.a<br />
Fiber<br />
Matrix<br />
Aliim<strong>in</strong>a LAS glass CVD Sic Si3N4 tib2 Mullite<br />
(8.5) (1.5) (4.8) (3.0) (8.1) (5.3)<br />
Aliirni na (8.5) 0.0 -857.8 -895.0 -1361.1 -123.4 -510.9<br />
Boron (4.7) 1071.6 -410.2 2k.J -429.5 1076.2 97.1<br />
Hi&-modul us 2945 I5 210.1 1415.7 309.8 3241.4 960.1<br />
carbon <strong>fiber</strong>s<br />
(0.0)<br />
Low-modulus 2207.8 185.1 1102.2 703.9 2338.9 817.4<br />
carbon <strong>fiber</strong>?<br />
(0.0)<br />
Nextel (2.0) 916.5 -44.1 368.6 133.3 909.7 339.3<br />
Nicalon (3.1) 897.2 - 155.7 260.6 -15.6 887.8 254.2<br />
"Numbers <strong>in</strong> paren<strong>the</strong>sss are u(10-6/"C).<br />
Table 5.3. Stresces <strong>in</strong>duced <strong>in</strong> <strong>the</strong> <strong>fiber</strong> by <strong>the</strong>rmal expanyjon<br />
mismatch upon cool<strong>in</strong>g f rom 1275 K to room tempeiature."<br />
Matrix<br />
Alum<strong>in</strong>a (8.5)<br />
Lithium alum<strong>in</strong>osilicate<br />
glass<strong>ceramic</strong><br />
(1.5)<br />
Mullite (5.3)<br />
CVD Sic (4.8)<br />
Silicon nitride<br />
(3.0)<br />
Titaniim diboride<br />
(8.1)<br />
Alum<strong>in</strong>a (8.5)<br />
Lj thiurn alum<strong>in</strong>osilicate<br />
glass<br />
<strong>ceramic</strong> (1.5)<br />
Mullite (5.3)<br />
CVI) Sic (4.8)<br />
Silicon nitride<br />
(3.0)<br />
Titanium diboridc<br />
(8.1)<br />
--<br />
._<br />
Fiber<br />
___<br />
Alum<strong>in</strong>a Boron Carbon Nextel Nicalon<br />
(8.5) (4.7) (0.0) (2.0) (3.1)<br />
Axial stress <strong>in</strong> <strong>fiber</strong> (<strong>in</strong> MPa)<br />
0.0 -714.4 -1493.1<br />
591.9 27'3.5 -124.4<br />
340.6 -64.7 -550.6<br />
596.7 -16.5 -746.4<br />
907.4 286.3 -476.8<br />
82.2 -717.5 -1590.3<br />
Interfacial pressure (<strong>in</strong> &"a)<br />
0.0 -550.7 -76.?b<br />
302.3 137.4 284.0b<br />
188.7 -35.1 ?61.8b<br />
603.3 -16.0 545.5b<br />
661.3 201 2 621.1h<br />
79.5 -658.4 -21.00<br />
BNumhers <strong>in</strong> paren<strong>the</strong>ses are CC(~~-~/'C).<br />
hadial expansion <strong>in</strong> carbon <strong>fiber</strong>s = 8.0 x 10-6/'C.<br />
-_<br />
-611.0 -680.9<br />
29.4 111.8<br />
-226.2 -185.2<br />
-245.7 -195.7<br />
-88.8 11.7<br />
-606.5 -680.3<br />
-728.5 -651.4<br />
19.8 64.0<br />
-172.7 -119.1<br />
-338.0 -222.1<br />
-95.5 10.2<br />
-849.0 -763.0