| Acknowledgement | 第1-6页 |
| 摘要 | 第6-8页 |
| ABSTRACT | 第8-10页 |
| Table of Contents | 第10-12页 |
| 1. Introduction | 第12-23页 |
| ·Background | 第12-16页 |
| ·Brief introduction of the previous project of UC24 | 第12-14页 |
| ·Introduction of conveyor chains PC23 0-gap and four kinds of UC24 | 第14-16页 |
| ·Present research on wear performances of polymers in water conditions | 第16-23页 |
| ·Patterns of contact pairs | 第16-17页 |
| ·Water increasing wear | 第17页 |
| ·Water decreasing wear | 第17页 |
| ·Water with different contents affecting wear | 第17-18页 |
| ·Influence of water on wear of polymers with different additions | 第18-19页 |
| ·Wear mechanism in water | 第19-23页 |
| 2. Purpose of the thesis | 第23-26页 |
| ·Verify water as an important factor | 第23页 |
| ·Examine the effect of chlorine(Cl)on wear | 第23页 |
| ·Desc ribe wear trend and wear limits in water | 第23页 |
| ·Compare the wear performances of POM with different additions | 第23-24页 |
| ·Explain wear mechanisms of water affecting wear of POM | 第24-26页 |
| 3. Improvements of the test rig | 第26-28页 |
| ·Adjust the height of sliding plane | 第26页 |
| ·Enlarge the width of sliding plane | 第26-27页 |
| ·Local improvements | 第27-28页 |
| 4. Wear tests | 第28-37页 |
| ·Preparation of water | 第28-29页 |
| ·Test arrangement | 第29-30页 |
| ·Test | 第30-33页 |
| ·Wear tests for PC23 and PC23 0-gap | 第30-32页 |
| ·Wear tests for four kinds of UC24 | 第32-33页 |
| ·Measuring instruments and methods | 第33-34页 |
| ·Phenomena and problems in wear tests | 第34-37页 |
| 5. Results and discussion | 第37-66页 |
| ·Weight loss analysis | 第38-40页 |
| ·Thickness loss analysis | 第40-45页 |
| ·Thickness loss of PC23 and PC23 0-gap | 第40-42页 |
| ·Thickness loss of four kinds of UC24 | 第42-45页 |
| ·Observations of wear morphologies | 第45-60页 |
| ·Wear morphologies of PC23 and PC23 0-gap | 第46-50页 |
| ·Wear morphologies of four kinds of UC24 | 第50-56页 |
| ·Wear morphologies of slide strips | 第56-60页 |
| ·Friction coefficients of PC23 and PC23 0-gap | 第60-61页 |
| ·Discussion of wear mechanism | 第61-65页 |
| ·Wear mechanism under dry sliding | 第61-63页 |
| ·Wear mechanism under water conditions | 第63-65页 |
| ·Improvements in wear resistance | 第65-66页 |
| 6. Summary and future research | 第66-69页 |
| ·Summary of the thesis | 第66-68页 |
| ·Future research | 第68-69页 |
| References | 第69-71页 |
