Microacoustical NDE of pyrocarbon materials for cardiovascular prosthetic application
|Yulia S. Petronyuk 1, Vladimir N. Zygan 2|
1. Institute of Biochemical Physics RAS (IBCP), Kosygin 4, Moscow 119991, Russian Federation
Primary atomic structure of pyrocarbons is close to atomic arrangement of natural graphite (stacks of hexagonal atomic planes). Further microstructure formation critically depends on pyrolysis conditions. Low-temperature (LT) pyrolysis gives different types of microstructure but only isotropic pyrocarbon is of special interest. The exceptional mechanical properties in combination with chemical and biological inertness have determined the main field of isotropic pyrocarbon application: the material is employed for manufacturing cordial prosthetic devices. Cardiovascular applications impose hard demands on pyrocarbon materials. Reliability of prosthetic devices depends on microstructure of pyrocarbons and presence of microdefects, on local mechanical properties and their distribution over the specimen body. We have developed high frequency focus ultrasound methods for evaluating local mechanical properties and microstructure, for visualizing defect distribution inside the material body and non-destructive inspection of material to be employed for prosthesis production.
Presentation: oral at E-MRS Fall Meeting 2003, Symposium E, by Yulia S. Petronyuk
See On-line Journal of E-MRS Fall Meeting 2003
Submitted: 2003-07-10 15:53 Revised: 2009-06-08 12:55