學術動態
Ralf Riedel教授報告會通知
2019-05-20 17:09   審核人:

報告人:Ralf Riedel教授

主題:Polymer-Derived Ceramics: Sustainable Materials for Energy

Conversion and Storage

主持人:欒新剛 副教授

時間:2019522日(星期三)上午900(開始時間)

地點:友誼校區超高溫結構復合材料實驗室三樓會議室

內容簡介:Two PDC classes capable to be operated at ultrahigh temperatures (i.e., T beyond 1500 °C) as well as their potential for the fabrication of thermal barrier coatings (TBCs) and environmental barrier coatings (EBCs) will be presented. Firstly, substrate materials based on the Mo-Si-B (molybdenum silicide boride) intermetallic system will be introduced, which exhibit improved UHT behavior with respect to the state-of-the-art Ni-base superalloys.  Beside details on their preparation, physical and thermomechanical properties thereof will be presented. Furthermore, the synthesis and the UHT behavior of Si?Hf?C?X-based (X = O, N, B) ceramic nanocomposites will be discussed as novel candidate materials for top coats used in TBC applications in comparison to the zirconia-based state?of?the?art coatings. Information on the processing of the two material classes to produce TBC / EBC systems will be also provided. PDC method also is demonstrated a cost-effective synthesis route for coated highly porous Si that is simple to implement and provides Si-based anode materials with capacities between 2000 and 3000 mAhg-1, Coulombic efficiencies above 99.5 %, and almost 100 % capacity retention over more than 100 cycles. The Si-based composite is prepared from porous silicon (obtained by reduction of silica) by encapsulation in an organic carbon and polymer-derived siliconoxycarbide (C/SiOC) matrix.

報告人簡介

Ralf Riedel是德國達姆施塔特工業大學材料科學和地球科學教授,美國陶瓷學會會員、歐洲陶瓷學會會員、世界陶瓷科學院院士、陜西省短期千人、西北工業大學講座教授,其研究領域包括先進陶瓷的合成国民彩票手机版下载、結構和功能特性以及新材料的超高壓合成等。

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