The improvement of the adhesion strength of diamond films
Abstract
The effect of surface decarburization of a tungsten carbide (WC) substrate on the adhesion strength of diamond films is investigated. Surface decarburization and diamond coating were carried out using a microwave plasma chemical vapor deposition apparatus. Good adhesion was obtained by surface decarburization of the substrate before diamond coating. From the results of observations by SEM and TEM, the improvement in the adhesion strength is argued to be due to an increase in the contact area between the film and the substrate by the generation of fine WC grains on the surface of the substrate, with the film embedded in the shape of a wedge at the fine WC grain boundaries. The coated insert demonstrates a very small steady wear without film flaking when milling a hard carbon compared with the large amount of wear exhibited by uncoated cemented carbides.
- Publication:
-
Metallurgical Coatings and Thin Films 1990, Volume 1
- Pub Date:
- 1990
- Bibcode:
- 1990meco....1...30S
- Keywords:
-
- Adhesive Bonding;
- Decarburization;
- Diamond Films;
- Surface Treatment;
- Tungsten Carbides;
- Vapor Deposition;
- Aluminum Alloys;
- Ceramic Coatings;
- Fracture Strength;
- Silicon Alloys;
- Solid-State Physics