|About this Abstract
||Materials Science & Technology 2019
||Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
||P2-70: Characterization of Graphite-Si-SiC Ceamics Processed by Microwave Assisted Reactive Melt Infiltration
||Elisa Padovano, Mauro Giorcelli , Giovanni Bianchi , Sara Biamino , Massimo Rovere , Alberto Tagliaferro , Alberto Ortona
|On-Site Speaker (Planned)
A novel kind of graphite-Si-SiC ceramics was successfully prepared by liquid silicon infiltration of graphite-based preforms; unlike the conventional methods, the reactive infiltration process was assisted by microwave. The effects of microwave power variation on the microstructure and the mechanical properties of infiltrated materials were investigated. X-ray diffraction and Raman investigations showed the presence of both unreacted graphite and Si, in addition to formed SiC. The graphitic and silicon phases were separated by a SiC network, which results more homogeneous as microwave power was increased. Moreover the amount of SiC increases as function of the growing microwave power level; a higher conversion of graphite into SiC yielded a more dense material. This is confirmed by bending strength measurements which show higher values for the samples processed using a power level of 75% of the full power compared to those obtained with 30% and 60%.
||Planned: At-meeting proceedings