Temperature-Dependence of Mechanical Properties of Si-Ti-C-O Fiber-Bonded Ceramic
Temperature-Dependence of Mechanical Properties of Si-Ti-C-O Fiber-Bonded Ceramic
复制标题
Si-Ti-C-O 纤维结合陶瓷机械性能的温度依赖性
DOI：
10.2109/jcersj.109.1275_934
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发表时间：
2001
影响因子：
1.1
通讯作者：
S. Mitsuhiko
中科院分区：
文献类型：
--
作者：
K. Matsunaga;T. Ishikawa;S. Kajii;T. Hogami;S. Mitsuhiko
研究了 Si-Ti-C-O 纤维粘结陶瓷的各种机械性能的温度依赖性。该材料通过热压氧化缎纹编织 Si-Ti-C-O 纤维薄片制成，与普通陶瓷基复合材料相比，具有非常高的纤维体积分数（约 0.85）和非常小的孔隙率。材料在室温下的面内拉伸、压缩和层间剪切强度一直保持到1400℃，而面外方向（横向）的杨氏模量和压缩强度在1400℃时下降。拉伸和层间剪切强度的行为分别与纤维拉出长度和分层位置的变化非常一致。在1500℃的内、外方向压缩试验后，分别观察到纤维平行于应力轴的屈曲和试样断裂面的较大变形。从力学性能和断裂形貌的差异来看，高温下断裂强度的变化是由非晶SiO2相的软化引起的。
Temperature-dependence of various mechanical properties of Si-Ti-C-O fiber-bonded ceramic is investigated. The material was produced by hot-pressing the laminae of oxidized satin-woven Si-Ti-C-O fibers, and then showed very high fiber-volume fraction (around 0.85) and very little porosity, compared with ordinary ceramic matrix composites. The in-plain tensile, compressive and inter-laminar shear strengths of the material at room temperature were maintained up to 1400°C, whereas the Young's modulus and the compressive strength of out-plain direction (transverse direction) decreased at 1400°C. The behavior toward the tensile and inter-laminar shear strengths were in good agreement with the changes in fiber pull-out length and delaminating position, respectively. A buckling of the fibers parallel to the stress axis and a large deformation of the specimen were observed in the fracture surface after compression tests of in- and out-plain directions at 1500°C, respectively. From the differences in the mechanical properties and fracture morphologies, it was concluded that the change in the fracture strength at the high temperature was caused by softening of the amorphous SiO2 phase.