Author: Jin, Duo
Title: A study of friction, noise and wear particle emissions from copper-free friction materials sliding against cast iron
Advisors: Choy, Yatsze (ME)
Degree: M.Sc.
Year: 2019
Subject: Hong Kong Polytechnic University -- Dissertations
Friction materials
Automobiles -- Brakes
Automobiles -- Noise
Department: Faculty of Engineering
Pages: 11, 93 pages : color illustrations
Language: English
Abstract: Copper 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.
Rights: All rights reserved
Access: restricted access

Files in This Item:
File Description SizeFormat 
991022270854003411.pdfFor All Users (off-campus access for PolyU Staff & Students only)2.86 MBAdobe PDFView/Open

Copyright Undertaking

As a bona fide Library user, I declare that:

  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.

By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

Show full item record

Please use this identifier to cite or link to this item: