Processing and mechanical properties of short fibers/Si3N4p reinforced BaO·Al2O3·2SiO2 ceramic matrix composites

✍ Scribed by Jingmei Ma; Feng Ye; Limeng Liu; Haijiao Zhang

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 949 KB
• Volume: 520
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2009.06.029

✦ Synopsis

Dense short silicon carbide (SiC sf ) and carbon fibers (C sf ) reinforced BaAl 2 Si 2 O 8 (BAS) glass-ceramic composites with silicon nitride were fabricated by hot-pressing technique. The phase characterization, microstructure, mechanical properties and fracture behavior of the composites were investigated by Xray diffraction, scanning electron microscopy, transmission electron microscopy and three-point bending tests. The results showed that short silicon carbide and carbon fibers disperse homogeneously in BAS matrix, and had good chemical compatibility with the glass-ceramic matrix. The addition of Si 3 N 4 could successfully eliminate the microcracks in the BAS matrix induced by the thermal mismatch between the fiber and matrix. Both the added short fibers could effectively reinforce the BAS glass-ceramic by the associated toughening mechanisms such as crack deflection, fiber bridging and pullout effects.