Jc. Gu et al., Microstructure and mechanical properties of SiC platelet reinforced BaOAl(2)O(3)2SiO(2) (BAS) composites, CERAM INT, 26(8), 2000, pp. 855-863
BaOAl(2)O(3)2SiO(2) (BAS) glass-ceramic powders were prepared by sol-gel te
chnique. SIC platelet reinforced BAS glass-ceramic matrix composites with h
igh density and uniform microstructure were fabricated by hot-pressing. The
effect of additional crystalline seeds on hexagonal to monoclinic phase tr
ansformation of Barium aluminosilicate was studied. The effects of SIC plat
elet content on the microstructure and mechanical properties of the composi
tes were also investigated. The results showed that the flexural strength a
nd fracture toughness of the BAS glass-ceramic matrix composites can be eff
ectively improved by the addition of silicon carbide platelets. The main to
ughening mechanism was crack deflection, platelets' pull-out and bridging.
The increased value of flexural strength is contributed to the load transit
ion from the matrix to SIC platelets. (C) 2000 Elsevier Science Ltd and Tec
hna S.r.l. All rights reserved.