Influence of substrate surface roughness on the wear of hard ceramic and DLC coatings
碩士 === 國立成功大學 === 機械工程學系碩博士班 === 96 === The purpose of this research is study the Influence of substrate surface roughness and varied coating thickness on the wear and adhesion properties of hard ceramic and DLC coatings deposited on HSS tool steel substrate by close-field unbalanced magnetron sputt...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2008
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| Online Access: | http://ndltd.ncl.edu.tw/handle/11834047899490074966 |
| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 96 === The purpose of this research is study the Influence of substrate surface roughness and varied coating thickness on the wear and adhesion properties of hard ceramic and DLC coatings deposited on HSS tool steel substrate by close-field unbalanced magnetron sputtering system. The effect of coating thickness on surface microstructure and morphology analysis was analyzed by FE-SEM and SEM. Adhesion of the coating to the substrate was assessed by using a Rockwell C hardness tester and a scratch test machine. The tribological performance of the coatings was tested by a Pin-on-disk wear test machine against AISI 52100 balls. Finally, the best ratio of surface roughness and coating thickness for apply in roughness and coating thickness mechanism relation was obtained. The experiment results show as following: three of the hard ceramic coatings have the same deposition designs, but the grains size become smaller with decreasing sputtering duration. The bigger grains obtained on the peak of the rough surface due to the geometrical effect. The optimal roughness (R) depends on the coating thickness (H). The optimal H/R value which more then 30 has the best wear resistance.
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