Date(s) - 22 Mar 2021 until 22 Mar 2021
3:20 PM - 4:10 PM
This is a webinar event.
Speaker: Kyle Webber, Professor for Functional Ceramics at Friedrich-Alexander-Universität Erlangen-Nürnberg
Title: Room Temperature Deposition of Functional Ceramics Films
Abstract: The deposition of functional ceramic films is important for a variety of applications that span a number of technological sectors, such as medical, defense, transportation, and telecommunications. Traditionally, such films are deposited using methods that require high thermal fields, which limit possible substrate materials as well as increase the overall production cost and time. Aerosol deposition, originally developed in Japan by Jun Akedo, however, is a room temperature film deposition technique that uses the high kinetic energy of aerosol, consisting of ceramic particles and a carrier gas, that is ejected through a subsonic nozzle. The discharged particles impact a substrate at high velocity depending on a number of parameters, such as the nozzle design, carrier gas, carrier gas pressure, etc., where they fracture and consolidate into a dense ceramic film consisting of nano-size grains. This technique can also be applied to glasses, metals, polymers, and semi-conductors, allowing for the combination of these materials not possible with higher temperature deposition methods. Recently, a technique has also been developed at FAU to produce both porous and freestanding films, which can be applied to any film material and does not require thermal treatment. Despite the potential of this technique, there are a number of drawbacks limiting its commercial use, such as nanograins, large internal residual stresses, and increased electrical conductivity. In this presentation, the aerosol deposition method will be discussed in detail, in addition to ongoing research efforts to understand the deposition mechanism and adhesion to the substrate as well as the origins of the internal stress and electrical conductivity. Here, the influence of these effects on the functional properties of ferroelectrics and methods to enhance the electromechanical properties and thermal stability will be presented.
Bio: Kyle G. Webber is a Professor of Functional Ceramics in the Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany, where he is Head of the Glass and Ceramics Institute, Dean of Studies for the Engineering Department, and Director of the International Research Training Center “Energy Conversion Systems: From Materials to Devices”. He received a B.Sc. in Marine Systems Engineering from Maine Maritime Academy in 2003, where he obtained a US Coast Guard license for a 3rd Assistant Engineer, and a M.Sc. and Ph.D. in Mechanical Engineering from the Georgia Institute of Technology in 2005 and 2008. His primary research focus is temperature-dependent electromechanical properties of functional ceramics, field-induced phase transformations, and ceramic/ceramic composites. He is an Emmy Noether Research Fellow of the German Research Foundation and was awarded the IEEE UFFC Ferroelectrics Young Investigator Award in 2017. He has authored or co-authored more than 105 refereed publications in the field of electroceramics.
Seminar Host: Xiaoli Tan
Zoom Link: https://iastate.zoom.us/j/98606829281