【摘 要】
：
3D four directional braided (SiO2)f/SiO2 composites were prepared by silicasol-infiltration-sintering method.The specimen density was determined to be 1.71 g/cm3 by using the Archimedes principle.The
【出 处】
：
2012 Postdoctoral Symposium of China on Materials Science &
论文部分内容阅读
3D four directional braided (SiO2)f/SiO2 composites were prepared by silicasol-infiltration-sintering method.The specimen density was determined to be 1.71 g/cm3 by using the Archimedes principle.The flexural properties were evaluated by three-point bending test.The flexural strength and flexural elastic modulus were found to be 62 MPa and 11 GPa, respectively.The stress vs.deflection curve showed a typical composite behavior, initially a linear elastic response, followed a nonlinear region and finally failed gracefully.The SEM micrograph of the fracture sections showed extensive fibers pull-out, indicating the composites exhibited good toughness.A distinctly crevice was observed along the interfacial region, indicating the weak interfacial bonding between fiber and matrix, resulting in extensive fibers pull-out with a failure strain.The results of stress vs.deflection and SEM examination revealed that the fracture mechanism of the (SiO2)f/SiO2 composite was a mixed mode of brittle and ductile.
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