Fracture toughness of diamondlike carbon coatings Journal Articles

abstract

• The fracture behavior of diamondlike carbon (DLC) coatings on Si substrates has been examined using microindentation. The presence of DLC coatings reduces the radial crack length to less than one-half the crack length observed in uncoated Si at the same indenter load. A total work of fracture analysis of the radial cracks formed in the DLC-coating/Si-substrate system gives 10.1 MPa m1/2 as the average fracture toughness for DLC alone. A bond-breaking calculation for DLC suggests that the elastic limit fracture toughness should be 1.5 MPa (m)1/2. The higher value obtained from experiment and total work analysis suggests that plastic work and/or a tortuous path crack evolution occurred during DLC fracture process.

authors

• Nastasi, M
• Kodali, P
• Walter, KC
• Embury, Johndavid
• Raj, R
• Nakamura, Y

status

• published 

publication date

• May 1999

has subject area

• 0204 Condensed Matter Physics (FoR)
• 0912 Materials Engineering (FoR)
• 0913 Mechanical Engineering (FoR)
• Materials (Science Metrix)

published in

• Journal of Materials Research  Journal

keywords

• FILMS
• INDENTATION FRACTURE
• Materials Science
• Materials Science, Multidisciplinary
• SILICON
• STRESSES
• Science & Technology
• Technology

Digital Object Identifier (DOI)

• 10.1557/jmr.1999.0293

start page

• 2173

end page

• 2180

volume

• 14

issue

• 5