Revealing of Factors of Increased Wear of Friction Carbon–Carbon Materials in Aircraft Taxi Brakes

IF 0.5 4区 工程技术 Q4 ENGINEERING, MECHANICAL
V. V. Kulakov, A. K. Golubkov, L. N. Kirillova
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Abstract

The study compared properties of carbon–carbon composites for manufacturing aircraft brakes. Composites based on various graphitized and carbonized fibers, coal, tar pitch, and pyrocarbon matrices were considered. Friction tests were carried out on full-size brake discs (three-disk stand) and on model samples (UTM-2168 testing machine). A significant wear increase of composites based on a pyrocarbon matrix was found during taxi braking in the temperature range of 50–250°C. Wear of composites based on a coal tar pitch matrix did not depend on the temperature of the friction surface. It was found, that the “third body” of composites based on pyrocarbon has a coarse rough structure with distinct individual abrasive particles; its hardness is more than twice as high as the hardness of the third body of composites based on pitch matrix. The size distribution of pores for composites based on different matrices is given, the difference in the quantity and size of structural defects is illustrated. The variation in wear of materials during taxi braking is explained. The increase of degree of anisotropy of the pitch matrix, provided the decrease of wear of the material. The wear was measured during taxi braking of specimens with a hybrid matrix having a different ratio of coal tar pitch and pyrocarbon components. Carbon–carbon composites containing 45% or more of the pitch component in matrix have stable reduced wear during taxi braking, regardless of the reinforcement scheme. The possibility of reducing wear during taxi braking of composites on pyrocompacted matrices by modifying the matrix with pitch is shown.

Abstract Image

Abstract Image

揭示飞机滑行制动器摩擦碳-碳材料磨损加剧的因素
摘要 这项研究比较了用于制造飞机制动器的碳-碳复合材料的性能。研究考虑了基于各种石墨化和碳化纤维、煤、焦油沥青和热碳基质的复合材料。在全尺寸制动盘(三盘支架)和模型样品(UTM-2168 试验机)上进行了摩擦试验。在 50-250°C 的温度范围内,发现基于热碳基质的复合材料在滑行制动过程中磨损明显增加。煤沥青基复合材料的磨损与摩擦表面的温度无关。研究发现,基于火碳的复合材料的 "第三体 "结构粗糙,具有明显的单个磨料颗粒;其硬度是基于沥青基质的复合材料第三体硬度的两倍多。给出了基于不同基体的复合材料的孔隙大小分布,并说明了结构缺陷的数量和大小差异。解释了滑行制动过程中材料磨损的变化。沥青基体各向异性程度的增加降低了材料的磨损。在滑行制动过程中,对具有不同比例煤沥青和热碳成分混合基体的试样进行了磨损测量。在基体中含有 45% 或更多沥青成分的碳-碳复合材料,在滑行制动过程中可稳定地减少磨损,而与增强方案无关。通过用沥青对基质进行改性,可以减少热压实基质复合材料在滑行制动过程中的磨损。
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来源期刊
Journal of Friction and Wear
Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
1.50
自引率
28.60%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.
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