Fracture Studies of Diamond Films on Silicon
Abstract
Diamond coatings were prepared on silicon substrates for fracture studies. Two thicknesses of coatings were evaluated: 6 m and 12 m. The diamond films increased the strength of the silicon for the same size fracture initiating crack and thus caused an apparent toughness increase from 1.1 MPam 1/ 2 for the uncoated silicon to about 1.6 MPam 1/2 for the 12 m coated silicon. Fractography showed that the indentation impression on the coated surface was altered by the coating, but this did not alter the formation of the radial crack beneath the surface so that indentation fracture mechanics can be used for thin coatings with thicknesses below 12 m. Fractography also showed that the coatings separated from the substrate under and near the indentation site, but was still intact away from the indentation. Most of the fracture in the diamond coating was transgranular indicating good intergranular adhesion.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 28, 1991
- Accession Number
- ADA240978
Entities
People
- J. J. Mecholsky Jr.
- W. R. Drawl
- Y. L. Tsai
Organizations
- University of Florida