Engineering Interfaces in Metal Matrix Composites (Volume 3)
Final technical rept.
MASSACHUSETTS INST OF TECH CAMBRIDGE
Pagination or Media Count:
The critical energy release rate for separation of thin coatings from their substrate can be determined accurately in many instances when the coatings are elastic, and are under a state of residual stress. When the thickness of such coatings reaches a critical value, so that the elastic strain energy per unit surface area in them equals the specific work of fracture of the interface, the coating will delaminate from the substrate in quasi-static equilibrium. Through analysis of such delaminations of SiC coatings from single crystal Si substrates and Pitch-55 carbon fibers, the intrinsic toughness of Si-SiC and C-SiC interfaces have been determined.
- Properties of Metals and Alloys