Tribological characterization of functionally gradient composite (Cu–Fe–CeO2–Al2O3–Cg) for wind turbine brake pad

IF 1.6 Q4 MATERIALS SCIENCE, COATINGS & FILMS Tribology - Materials, Surfaces & Interfaces Pub Date : 2023-01-02 DOI:10.1080/17515831.2022.2160160

Vummitti Chandhan Kumar, K. Rajesh Kannan, G. Srivathsan, A. Vignesh Ram, Vallabhaneni Sravan, R. Vaira Vignesh, M. Govindaraju

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Abstract

ABSTRACT Copper-based functionally gradient composite material is developed using powder metallurgy processing technique, as a potential wind turbine brake pad material. The developed composite has a gradient composition of Cu, CeO2, Al2O3, Fe, and Cg to enable joint strength at the interface (brake calliper) and wear resistance at the contact surface (brake disc). The article presents a comprehensive analysis on the microstructure, microhardness, and tribological performance of the developed composite. The wear mechanism is deduced through surface morphology, elemental composition, and phase composition analysis using field emission scanning electron microscope, energy dispersive X-ray spectroscope, X-ray diffractometer, and X-ray photoelectron spectroscope. A maximum hardness of 198.2 HV was obtained at the contact surface. Experimental values from tribology tests show that a decreasing trend was obtained with a wear rate of 2.013 × 10−7 g N-m−1 and a friction coefficient was 0.215. GRAPHICAL ABSTRACT

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Cu-Fe-CeO2-Al2O3-Cg功能梯度复合材料的摩擦学特性研究

采用粉末冶金加工技术开发了铜基功能梯度复合材料，作为一种有潜力的风力发电机刹车片材料。所开发的复合材料具有Cu、CeO2、Al2O3、Fe和Cg的梯度组成，以提高界面(制动卡钳)的结合强度和接触面(制动盘)的耐磨性。本文对所研制的复合材料的显微组织、显微硬度和摩擦学性能进行了综合分析。利用场发射扫描电镜、能量色散x射线能谱仪、x射线衍射仪、x射线光电子能谱仪等对材料表面形貌、元素组成、相组成进行分析，推断磨损机理。接触表面的最大硬度为198.2 HV。摩擦学试验值表明，磨损率为2.013 × 10−7 g N-m−1，摩擦系数为0.215，磨损率呈下降趋势。图形抽象

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Tribology - Materials, Surfaces & Interfaces MATERIALS SCIENCE, COATINGS & FILMS-

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2.80

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