Colloquia Announcements
All colloquia begin at 13:30 in Room 301 of Old Engineering, unless otherwise indicated.
Subject: CEAS ENGINEERING FAIR THIS WEDNESDAY OCT 15
All faculty and staff and all interested students are invited -and
encouraged-- to attend the annual CEAS fair on Wednesday. PLEASE ANNOUNCE IT
IN YOUR CLASSES.
Freshmen and sophomores are especially urged to join the festivities to see
what kinds of activities the various clubs and societies are engaged in and to
join those clubs if they're interested.
1-1:45 PM STEPHEN A. BARRE, CHAIRMAN & PRESIDENT
SERVO CORPORATION
"INDUSTRY, TECHNOLOGY, AND YOUR CAREER"
Engineering, Lect Hall 145
1:45- 3 PM COOK-OUT IN THE ENGINEERING QUAD
Compliments of CEAS !
ALSO IN THE ENGINEERING QUAD, 2 - 4 PM:
- CEAS Student Clubs and societies, information and
exhibits. See the SAE racing car. Get information on
current (Fall semester) and upcoming (Spr and Summer)
internships.
- Freshmen and sophomores - visit open labs and classes.
(List available in the Engineering Lobby and Quad.)
An introduction to the experimental technique and interpretation of the data will be given, followed by a number of illustrative examples. These examples will include polymer, Langmuir-Blodgett, and lipid bilayer films, in addition to superconducting films, magnetic superlattices, and electrochemically active surfaces, if time permits. Finally, consideration will be given to the importance of phase information in the inversion of measured reflectivities.
The granular nature of metallic thin films is an increasingly important consideration in their performance. Much attention is now being paid to factors that affect the evolution of grain structure in both as-deposited and reacted thin films. A consistent interpretation of reaction kinetics and microstructural evolution in these systems is beginning to emerge. In this picture, thin film reactions are comprised of both nucleation and growth processes, the latter being intimately related to microstructural evolution. We review and summarize the results of our experimental studies in the Nb/Al and Ti/Al systems and interpret the observed microstructures within the framework of new and existing models of the grain structure of thin films. We will also discuss recent microstructural measurements and observations and briefly describe theoretical and simulation advances in understanding the impact of nucleation conditions on the temporal evolution of the transformation.
Metal/Ceramic thermal barrier coatings have been produced by electrodeposition and electrophoretic deposition and reaction bonding. Microhardness, optical and scanning electron microscopy were used to characterize these coatings which comprise four layers: electroplated particulate composites of Ni-Al, and Ni-Al-alumina, electrophoretically deposited reaction bonded alumina + yttria stabilized zirconia, and yttria stabilized zirconia. The shape and size of the particles have a significant impact on the quality of the electrodeposited layers, with dense layers being obtained for "rounder", smaller particles. The hardness of these layers did not follow a simple rule of mixtures, possibly due to change in the microstructure of Ni matrix when a second phase was incorporated. The formation of the reaction bonded alumina plus yttria stabilized zirconia layer requires the oxidation resistance afforded by aluminum in the underlying electroplated layer. In this talk, in addition to the details of the processing and microstructure of the coatings, the results of thermal cycling of these four layer coatings will be presented.
All colloquia begin at 1:30 PM in Room 301 of Old Engineering, unless otherwise indicated.
For comments please contact james.quinn@sunysb.edu