Biomedical Engineering Reference
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(a)
Vessels
t
D~ 30
μ
m
t
Infiltration
Beech
20
μ
m
Si
C
Si
C
Si
Reaction
μ
SiC
μ
SiC
Spalling
Axial plane
μ
SiC precipitation from SiC solution in liquid Si
μ
20
μ
m
SiC grains spalling/migration
t
D~ 5
μ
m
t
(b)
Si
C
Si
C
Si
Libriform
“fibers”
nSiC
Reaction
Eucalyptus
5
μ
m
SiC
μ
SiC formation in the small vessels
nSiC formation in SiC/C interphase (rapid cooling)
diffusion control
μ
Figure 11.11.
(a) Infi ltration-Reaction model in the large channels of the preform.
(b) Infi ltration-Reaction model in the narrow channels of the preform.
the system is allowed to react in typical fabrication conditions, the microstructure
is frozen in the fi rst growth stage.
11.3.4 Mechanical Properties
The mechanical properties of biomorphic SiC have been extensively studied
[Mart í nez, 2000 ; Mart í nez, 2003 ; Varela, 2001 ; Varela, 2002 ; Varela, 2002b ; Singh,
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