| 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 Brakes 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 | Size | Format | |
|---|---|---|---|---|
| 991022270854003411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.86 MB | Adobe PDF | View/Open |
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