Tribological performance of multilayer DLC coatings deposited on tungsten carbide substrate
| Autor: | Yuan-HanJhang, 張沅翰 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 The main purpose of this study is to research the tribological properties and mechanical properties of a-C:H:Zr coatings prepared by sputtering graphite and Zirconium targets with unbalanced magnetron sputtering system (UBMS). It contains third stages of research in the study.The objective is influence of Zr target current on the properties of coatings in first stage. With the increase of the Zirconium targets current to get various Zirconium quantities of coatings in second and third stage, After SRV tribological test we verify that the coating prepared under the 0.4 A current has highest wear resistance and adherent properties. In second stage, we select to current of 0.4 A based on first stage. Thus, although a DLC has excellent properties a practical problem with them is that stress increases with the increase in hardness.When the adhesiveness between a film and a substrate is not so good, a film can partially ablate. An improvement of the adhesiveness with a substrate has been studied multilayer in the interlayer.we change the multilayer to interlayer,has one multilayer to four multilayer.It has been found two multilayer in the interlayer, improves the adhesion between the coating and substrate. Finally, we follow the second stage, discover the hardness also low. We have to improve the hardness, it design the multilayer films. It contain hard and soft layer in the multilayer films. It has been found eight multilayers, improves the hardness and a characteristic tribological. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|