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Full-Text Articles in Engineering
Linking The Structure And Mechanical Behavior Of Nanoporous Gold, Ye Sun
Linking The Structure And Mechanical Behavior Of Nanoporous Gold, Ye Sun
University of Kentucky Doctoral Dissertations
The structure of nanoporous gold (np-Au) provides a very limited volume for deformation to occur, and thus offers an opportunity to study the role of defects such as dislocations in nanoscale metal volumes. A practical goal is to understand mechanical properties of np-Au so that it can be can produced in stable form, for use in applications that require some mechanical integrity. Bulk and thin film np-Au have been fabricated and studied here.
Bulk np-Au was prepared by electrochemically dealloying Au-Ag alloys with 25 and 30 at.% Au. In the lower Au content material, cracks always formed during dealloying. When …
Thermal Degradation And Aging Of High Temperature Piezoelectric Ceramics, Sunil W. Gotmare
Thermal Degradation And Aging Of High Temperature Piezoelectric Ceramics, Sunil W. Gotmare
University of Kentucky Master's Theses
Piezoelectric materials have numerous applications like high temperature accelerometers, pressure, flow and NDT transducers, acoustic emission, ultrasonic cleaning, welding, high voltage generators, medical therapy etc. The commonly used piezoelectric material, PZT continues to dominate the commercial market for piezoelectric actuators applications. The primary limitations of PZT are the lower Curie temperature TC <390oC and rapid thermal degradation avobe 200oC.
Continuing efforts are focused on the development of piezoelectric materials suitable for high temperature applications >200oC. These materials will be very useful for making sensors for space exploration, oil and geothermal well drilling tools, oil …