Characterization of Ultra-high Temperature Ceramics via Transmission Electron Microscopy Relevant ZrB2-based Composites, TaC-based Composites and Oxides Containing SiC Chopped Fibers
Final rept. 8 Dec 2013-7 Mar 2015
NATIONAL RESEARCH COUNCIL FAENZA INST OF SCIENCE AND TECHNOLOGY FOR CERAMICS
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The work herein described is the final report of the third year of activity in the frame of the contract No. FA8655-12-1-3004 between the US Air Force Research Laboratory and the Institute of Science and Technology of Ceramics, National Research Council of Italy ISTEC-CNR. Materials production and first microstructural characterization have been carried out at ISTECCNR in Faenza Italy, transmission electron microscopy analyses have been performed at the Institute of Microelectronic and Microsystems, National Research Council of Italy IMM-CNR in Bologna, mechanical characterization has been performed at ISTEC-CNR in Faenza Italy. This report deals with the production and characterization of relevant ZrB2 composites, with high refractory properties or containing short and long SiC fibers, TaC-based composites containing various types of reinforcement and at last oxides of Al and Zr containing short Hi-Nicalon fibers. Transmission electron microscopy has been used as fundamental technique to disclose the reinforcement features and their modification upon sintering of the composite. In addition some mechanical properties, like fracture toughness, strength from room temperature to 1500 C and nanoindentation, have been measured and correlated to the microstructural characteristics.
- Inorganic Chemistry
- Ceramics, Refractories and Glass
- Laminates and Composite Materials