Enhancement of tribological properties in siliconized graphite via hierarchically hybrid SiC/C composite
Enhancement of tribological properties in siliconized graphite via hierarchically hybrid SiC/C composite作者机构：State Key Laboratory of Tribology Department of Mechanical Engineering Tsinghua University Institute of Chemical Defense Academy of Military Sciences
出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))
年 卷 期：2021年第31卷第2期
页 面：255-263页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：financially supported by the National Key R&D Program of China (Grant No. 2018YFB2000100) the Aviation Science Fund of China (Grant No. 20164058002) the Tsinghua University Initiative Scientific Research Program and Beijing Municipal Science&Technology Commission (Grant No. Z181100004518004) the Science and Technology Commission of the Central Military Commission (Grant No.1916321TS00100501)
主 题：Siliconized graphite Coefficient of friction Surface microstructure Feature extraction
摘 要：This study aims to investigate tribological properties in a siliconized graphite(СГ-П-0.5) and hierarchically hybrid Si C/C composites at the load ranging from 10-40 N under dry air/water lubrication conditions. A feasible liquid silicon infiltration(LSI) was used to fabricate the Si C/C composites. Morphology and phase identification of two materials were characterized and analyzed by scanning electron microscope(SEM) and energy dispersive spectrometer(EDS). An image feature extraction was used to post-process the data of wear test, further to gain the wear properties of the samples. The results demonstrated that a lower coefficient of friction(COF) and wear rate can be achieved in the LSI Si C composites than that in the sample of СГ-П-0.5. Both COF decreased under waterlubricated conditions, compared with that under the dry air lubrication. The excellent tribological properties in two materials can be due mainly to the microstructure of the СГ-П-0.5 sample, showing much more graphite and Si dispersed on the matrix. The СГ-П-0.5 sample indicated the typical oxidative wear mechanism, whereas, the sample of LSI Si C demonstrated the combined oxidative and fatigue wear. This finding can provide a promising new siliconized graphite materials for ceramic rolling bearings.
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