Abstract

This work describes experimental studies on the effect of running-in on the tribological properties of friction carbon–carbon (C/C) composite materials used in the production of disc brakes on Russian airplanes. Three groups of friction material were selected for the study, differing in the reinforcement of the pec matrix. The first and second groups’ samples were made of Termar brand carbon composite on the basis of discrete graphitized fiber and different from each other in the length of filaments in the finished material. The third group of samples was made of a composite based on carbonized fiber. The friction coefficient was determined on a tribometer according to a scheme in which the contact pin was on the disc at room temperature (23°C) by a method of a two-factor planned experiment in the range of normal pressures 2—22 MPa and sliding velocities 0.03—0.30 m/s. The study of the third body on the friction path was carried out by Raman spectroscopy using an exciting green laser with a wavelength of 532 nm. The results obtained in this work show that the running-in of the studied C/C materials leads to an increase in the friction coefficient. This is due to the appearance of a third body on the friction track, which is a thin layer of wear particles. By Raman spectroscopy it was show that the third body mainly contains carbon fibers. This work demonstrates the prospects for improving the C/C friction properties by increasing the tribological properties of carbon fibers used in the manufacture of composites.

中文翻译：

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磨合对飞机刹车碳/碳复合材料摩擦系数的影响

摘要

这项工作描述了磨合对俄罗斯飞机盘式制动器生产中使用的摩擦碳－碳（C / C）复合材料的摩擦学特性影响的实验研究。选择三组摩擦材料进行研究，不同之处在于PEC基体的增强。第一组和第二组样品由Termar品牌碳复合材料制成，基于离散的石墨化纤维，并且最终材料中的长丝长度互不相同。第三组样品由基于碳化纤维的复合材料制成。摩擦系数是通过摩擦计根据以下方案确定的：在室温（23°C）下，接触销在圆盘上通过两因素计划实验的方法在常压2-22 MPa和滑动速度0.03-0.30 m / s。第三体在摩擦路径上的研究是通过拉曼光谱法使用激发绿色激光（波长为532 nm）进行的。在这项工作中获得的结果表明，所研究的C / C材料的磨合会导致摩擦系数的增加。这是由于在摩擦轨道上出现了第三主体，该第三主体是一层薄薄的磨损颗粒。通过拉曼光谱法表明，第三体主要包含碳纤维。