Np. Bansal, SIC FIBER-REINFORCED BARIUM ALUMINOSILICATE GLASS-CERAMIC MATRIX COMPOSITES, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 220(1-2), 1996, pp. 129-139
Unidirectional CVD SiC (SCS-6) monofilament reinforced BaO-Al2O3-2SiO(
2) (BAS) glass-ceramic matrix composites have been fabricated by a tap
e lay-up method followed by hot pressing. The glass matrix flows aroun
d fibers during hot pressing resulting in nearly fully dense (95-98%)
composites. Strong and tough composites having first matrix cracking s
tress of 250-300 MPa and ultimate flexural strength as high as 900 MPa
have been obtained. Composite fracture surfaces showed fiber pullout
with no chemical reaction at the fiber/matrix interface. From fiber pu
sh out, the fiber/matrix interfacial debond strength and the sliding f
rictional stress were determined to be 5.9 +/- 1.2 MPa and 4.8 +/- 0.9
MPa, respectively. The fracture surface of an uncoated SiCf(SCS-0)/BA
S composite also showed fiber/matrix debonding, fiber pullout, and cra
ck deflection around the fibers implying that the SiC fibers may need
no surface coating for reinforcement of the BAS glass-ceramic. Applica
bility of micromechanical models in predicting the first matrix cracki
ng stress and the ultimate strength of these composites has also been
examined.