Fiber erosion of carbon fiber composite exposed to simulated ITER-relevant thermal impact by high-intensity pulsed ion beam
Fiber erosion of carbon fiber composite exposed to simulated ITER-relevant thermal impact by high-intensity pulsed ion beam
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DOI：
10.1016/j.fusengdes.2010.07.011
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发表时间：
2010-12
影响因子：
1.7
通讯作者：
X. P. Zhu;Y. Tang;Xiaogang Wang;M. Lei
中科院分区：
文献类型：
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作者：
X. P. Zhu;Y. Tang;Xiaogang Wang;M. Lei
在高强度脉冲离子束（HIPIB）装置上对碳纤维复合材料（CFC）进行了高热流密度下的热模拟实验，模拟了ITER偏滤器正常运行时对偏滤器区域的特定热冲击和非正常事件时对第一壁的特定热冲击。HIPIB弹丸能够以高达300 MW/m2 s1/2的热通量参数向靶材料提供极高的热通量，覆盖ITER的大部分热负荷。采用扫描电子显微镜（SEM）和微电子天平分别研究了氟氯化碳试样在HIPIB辐照后的表面形貌和失重情况。此外，拉曼光谱被用来研究暴露样品的微观结构的变化。还对纯石墨样品进行了对比试验。结果发现，CFC样品经历了一个更大的净重量损失相比，石墨在多次曝光，其中材料从CFC中的碳纤维剥离和/或断裂的形式进行沿着与基质spectrometry作为高热流暴露延长到10个镜头。碳纤维的各向异性热物理性能及其与石墨基体的界面结合强度是碳纤维侵蚀的主要原因，但增强碳纤维能保证碳氟碳化物的高温强度。
A carbon fiber composite (CFC) was thermally tested with high heat flux on a high-intensity pulsed ion beam (HIPIB) apparatus, simulating the ITER specific thermal impacts in divertor region during normal operation or on first wall during off-normal events. The HIPIB shot is capable of delivering an extremely high heat flux onto the target materials at a heat flux parameter of up to 300MW/m2s1/2covering most of the ITER heat loads. The surface morphology of CFC samples after the HIPIB exposure and the resultant weight losses were investigated using scanning electron microscope (SEM) and microelectronic balance, respectively. Moreover, Raman spectroscopy was used to study the microstructural changes of the exposed samples. Comparative tests were also carried out on pure graphite samples. It is found that the CFC samples underwent a severer net weight loss in comparison with the graphite under multi-shot exposure, where the material removal from the CFC proceeded in the form of carbon fibre exfoliation and/or fracture along with matrix spallation as the high heat flux exposure prolonged up to 10 shots. The fibre erosion process is attributable to the anisotropic thermophysical properties of carbon fibre and its interface bonding strength with graphite matrix though the reinforcing carbon fibre ensures excellent high-temperature strength of the CFC over the graphite.