Hi-Nicalon/SiC minicomposites with (pyrocarbon/SiC)n nanoscale multilayered interphases
Hi-Nicalon/SiC minicomposites with (pyrocarbon/SiC)n nanoscale multilayered interphases
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DOI：
10.1111/j.1151-2916.1999.tb02105.x
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发表时间：
1999-09-01
影响因子：
3.9
通讯作者：
Lamon, J
中科院分区：
文献类型：
--
作者：
Bertrand, S;Forio, P;Lamon, J
采用压力脉冲化学气相渗透法制备了SiC/SiC微复合材料，该复合材料包含不同的热解碳/碳化硅（PyC/SiC）（n）多层界面和SiC纤维束（Hi-Nicalon）。分别从丙烷和CH 3SiCl 3/H-2混合物中沉积热解碳和SIC。的界面相的微观结构：已使用透射电子显微镜进行了研究。在室温下的微型复合材料的机械拉伸行为表现出坚韧复合材料的经典特征，无论（PyC/SiC）序列的特性。界面剪切应力已确定从卸载/再加载后的滞后回线的宽度和饱和时的裂纹间距。所有的实验数据表明，纤维/界面的强度是相当弱的（类似于50 MPa）。
SiC/SiC minicomposites that comprise different pyrocarbon/silicon carbide ((PyC/SiC)(n)) multilayered interphases and a tow of SIC fibers (Hi-Nicalon) have been prepared via pressure-pulsed chemical vapor infiltration. Pyrocarbon and SIC were deposited from propane and a CH3SiCl3/H-2 mixture, respectively. The microstructure of the interphases:has been investigated using transmission electron microscopy. The mechanical tensile behavior of the minicomposites at room temperature exhibits the classical features of tough composites, regardless of the characteristics of the (PyC/SiC) sequences. The interfacial shear stress has been determined from the width of hysteresis loops upon unloading/reloading and from the crack-spacing distance at saturation. All the experimental data indicate that the strength of the fiber/interphase interfaces is rather weak (similar to 50 MPa).