The research of tungsten-dopedhydrogen-free diamond-like carbonmicron drills on PCB micro hole drilling
| Autor: | Jung-Kai Chen, 陳忠凱 |
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| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 The closed field unbalanced magnetron sputtering method was used in this article to deposit tungsten-doped hydrogenated-free diamond-like carbon (a-C:W) films onto high speed steel, tungsten carbide specimens, and micron drills. The effects of various W contents in a-C:W films were investigated. At first, in order to understand basic properties of a-C:W films, the experiments of micro-hardness tester, scratch tester, SRV tester were employed. Finally, in field PCB through hole drilling was used to examine the tribology properties of the coated micron drills. The experiment results are shown as following: The hardness of the films has no concern with different contents of tungsten of the films. The adherences of the films are best when tungsten contents 8.75at.%, and the adherences of the films on high speed steel are better than on tungsten carbide specimens. Among the SRV tester, all the coatings can reduce the friction coefficient successfully. For wear-resistance, all the coatings are very good; especially, wear-resistance of the films are best when tungsten contents 8.75at.%. In the PCB drilling tests, a-C:W films with 8.75at.% tungsten contents improved tool life 2 times more than uncoated ones. In the turning tests, all the films can not improve tool life when turning medium carbon steel. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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