The deteriorated tribological and noise performances of copper-based brake pads induced by the increased content of flake graphite

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2024-11-01 DOI:10.1016/j.engfailanal.2024.109033

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引用次数: 0

Abstract

Enhancing the lubricity of copper-based brake pads has been viewed as a crucial strategy to boost braking performance. Flake graphite and the oxide film are two substances that are widely concerned with providing lubrication at the friction interface. However, the results from full-scale dynamometer in this work indicate that the increased content of flake graphite with stronger lubrication and iron particles that accelerate the generation of oxide film lead to a deterioration in tribological and noise performance. This is manifested by high sensitivity to clamping force, significant fading behavior, increased sound pressure level and high-frequency noise. The evidence from the worn surface suggests that flake graphite is susceptible to peeling off from the friction surface, thereby amplifying the instability of the friction surface. The unstable existence of both flake graphite and oxide film during emergency braking actually diminishes the lubrication of the friction interface, likely resulting in the degraded braking performance. The indication suggests that the development of high-performance copper-based brake pads should aim to achieve a harmonization of diverse properties, rather than emphasizing only specific aspects.

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鳞片石墨含量增加导致铜基刹车片的摩擦学性能和噪音性能下降

增强铜基刹车片的润滑性一直被视为提高制动性能的关键策略。鳞片石墨和氧化膜是在摩擦界面提供润滑的两种广受关注的物质。然而，这项工作中的全尺寸测功机结果表明，润滑性更强的鳞片石墨和加速氧化膜生成的铁颗粒含量的增加会导致摩擦学性能和噪音性能的下降。具体表现为对夹紧力的敏感度高、衰减明显、声压级和高频噪声增加。磨损表面的证据表明，鳞片状石墨很容易从摩擦表面剥落，从而加剧了摩擦表面的不稳定性。在紧急制动时，鳞片状石墨和氧化膜的不稳定存在实际上降低了摩擦界面的润滑性，可能导致制动性能下降。这些迹象表明，开发高性能铜基刹车片的目标应该是实现各种性能的协调，而不是只强调特定方面。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.