Effect of FeSi2 content on tribological properties of C/C–SiC–FeSi2 composites
Effect of FeSi2 content on tribological properties of C/C–SiC–FeSi2 composites
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FeSi2含量对C/C-SiC-FeSi2复合材料摩擦学性能的影响
DOI：
10.1016/j.ceramint.2019.08.047
复制
发表时间：
2019-12
影响因子：
5.2
通讯作者：
Laifei Cheng
中科院分区：
文献类型：
--
作者：
Yifan Ning;Shangwu Fan;Le Wang;Chenghua Luan;Juanli Deng;Litong Zhang;Laifei Cheng
本文利用盘-盘摩擦磨损试验机研究了不同FeSi 2改性C/C-SiC复合材料的摩擦学性能。结果表明，FeSi 2的引入显著降低了C/C-SiC复合材料的线磨损率。另外，C/C-SiC经FeSi 75改性后，线磨损率明显降低，在高制动速度下，线磨损率仅为C/C-SiC磨损率的10%。但由于Fe-Si合金的过量引入，摩擦系数（CoF）衰减严重，通过降低C/C-SiC-FeSi 2中FeSi 2的含量可以解决这一问题。为了同时具有低磨损率和高CoF的优点，确定了C/C-SiC中合适的FeSi 2含量（例如，使用FeSi 95）。此外，通过对C/C-SiC-FeSi 2摩擦表面的显微组织图像配准，研究了摩擦表面在一系列制动停止后的发展情况。结果表明，FeSi 2的引入可以降低制动停止后摩擦表面的粗糙度，提高摩擦膜的完整性。这种覆盖C/C区域的连续摩擦膜能有效地降低磨损率。但过多的合金摩擦膜会降低表面粗糙度，削弱犁削效果。因此，在高制动速度下难以保持高CoF。通过对C/C-SiC中FeSi 2含量的研究，确定了C/C-SiC中FeSi 2含量不同所产生的三种摩擦膜类型。此外，还对其形貌进行了表征，以说明FeSi 2含量对复合材料摩擦学性能的影响。
In this work, tribological properties of different FeSi2-modified C/C–SiC composites have been studied using disk-on-disk type laboratory scale dynamometer. Results indicated that line wear rate decreased significantly with the introduction of FeSi2in C/C–SiC. In addition, when C/C–SiC is modified with FeSi75, linear wear rate decreased obviously and reduced to 10% of C/C–SiC wear rate at high braking speeds. However, coefficient of friction (CoF) attenuated seriously due to excess introduction of Fe–Si alloy and this attenuation can be solved by reducing the content of FeSi2in C/C–SiC–FeSi2. In order to have simultaneous advantages of low wear rate and high CoF, appropriate FeSi2content in C/C–SiC was identified (such as, using FeSi95). Furthermore, the development of friction surface of C/C–SiC–FeSi2through microstructural image registration of the surface after a range of braking stops is reported. It has been found that the introduction of FeSi2can reduce the roughness of friction surface after braking stops and increase the integrity of friction films. This continuous friction film that covers C/C region can effectively reduce wear rate. However, excessive alloy friction film will reduce surface roughness and weaken the effect of plough. Therefore, high CoF is hard to maintain at high braking speeds. From this study, three types of friction films are identified, which are generated by different FeSi2contents in C/C–SiC. Additionally, their morphologies are characterized to illustrate the effect of FeSi2content on tribological performance of the composites.
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DOI：
10.4028/www.scientific.net/msf.620-622.421
发表时间：
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期刊：
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影响因子：
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