Effect of heat treatment on cracking and strength of carbon/carbon composites with smooth laminar pyrocarbon matrix
Effect of heat treatment on cracking and strength of carbon/carbon composites with smooth laminar pyrocarbon matrix
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热处理对光滑层状热解碳基体碳/碳复合材料开裂和强度的影响
DOI：
10.1016/j.matdes.2016.06.017
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发表时间：
2016-10
影响因子：
8.4
通讯作者：
Zhang FQ
中科院分区：
文献类型：
--
作者：
Xia Lihong;Huang Boyun;Zhang Fuqin;Liu Zuming;Chen Tengfei;Zhang FQ
碳纤维预制件在2100 °C下进行预热处理，然后通过等温化学气相渗透填充光滑层状（SL）热解碳基质。研究了C/C复合材料在1800 ~ 2500 °C热处理后的显微结构和弯曲性能。显微结构研究表明，热处理对消光角没有影响，但在SL热解炭中产生了明显的界面裂纹和同心裂纹。三点弯曲试验表明，经2100 °C热处理后，C/C复合材料的弯曲强度从221 MPa迅速下降到108 MPa。这可以解释为多个界面脱粘和同心裂纹导致应力传递能力差和高应力集中。当复合材料在2500 °C的较高温度下热处理时，弯曲强度增加回到126 MPa。这种现象是由于裂纹桥接在脱粘区域和薄的高织构层在纤维基体界面。
Carbon fiber preforms were pre-heat treated at 2100 °C and then filled with smooth laminar (SL) pyrocarbon matrix by isothermal chemical vapor infiltration. The microstructure and flexural properties of carbon/carbon (C/C) composites after heat treatment from 1800 to 2500 °C were investigated. The microstructure investigation indicated that heat treatment did not affect the extinction angle, but resulted in distinct interfacial cracks and concentric cracks in the SL pyrocarbon. Three-point bending tests revealed that the flexural strength of the C/C composites decreased rapidly from 221 to 108 MPa after treated at 2100 °C. This can be explained that the multiple interfacial debonding and concentric cracks lead to poor stress transfer capabilities and high stress concentration. The flexural strength increased back to 126 MPa when the composites were heat treated under a higher temperature at 2500 °C. This phenomenon was attributed to cracks bridging in the debonding region and the thin high-textured layer at the fiber-matrix interface.
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影响因子：
8.4
作者：
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通讯作者：
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10.9
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作者：
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通讯作者：
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影响因子：
10.9
作者：
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