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DC FieldValueLanguage
dc.contributorFaculty of Engineeringen_US
dc.contributor.advisorChoy, Yatsze (ME)-
dc.creatorJin, Duo-
dc.identifier.urihttps://theses.lib.polyu.edu.hk/handle/200/10119-
dc.languageEnglishen_US
dc.publisherHong Kong Polytechnic University-
dc.rightsAll rights reserveden_US
dc.titleA study of friction, noise and wear particle emissions from copper-free friction materials sliding against cast ironen_US
dcterms.abstractCopper in the brake pad debris can be toxic to aquatic ecosystems. In addition, the legislation in the United States currently requires a reduction of copper in brakes. Therefore, the present research used ceramic fibers, steel fibers, carbon fibers and carbon nanotubes (CNT) to replace copper fibers in brake pad materials. A pin-on-disc test-rig was used to investigate the friction and wear behaviors, wear particle emissions and noise characteristics of four types of brake pad samples sliding against a cast iron disc under various applied forces. Results show that friction coefficient and contact temperature increase with increasing applied force in most cases. For particle emissions, total number concentration (TNC) and particle mass concentration (PMC) increase with increasing the applied force. There is no particular trend for the geometric mean diameter (GMD) result with applied force. Results for surface morphology of brake pad sample indicate that different contact pressure will generate different cracks on friction layer, and fewer cracks on the friction layer when applied force is large. For brake noise test, the sound pressure level (SPL) is proportional to the applied force and mass loss. In addition, surface morphology is related to the sound pressure level.en_US
dcterms.extent11, 93 pages : color illustrationsen_US
dcterms.isPartOfPolyU Electronic Thesesen_US
dcterms.issued2019en_US
dcterms.educationalLevelM.Sc.en_US
dcterms.educationalLevelAll Masteren_US
dcterms.LCSHHong Kong Polytechnic University -- Dissertationsen_US
dcterms.LCSHBrakesen_US
dcterms.LCSHFriction materialsen_US
dcterms.LCSHAutomobiles -- Brakesen_US
dcterms.LCSHAutomobiles -- Noiseen_US
dcterms.accessRightsrestricted accessen_US

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Please use this identifier to cite or link to this item: https://theses.lib.polyu.edu.hk/handle/200/10119