Open AccessThe Role of Sintering Additives on Synthesis of High Performance Ceramic- Matrix Composites (Cmcs) by Volume Combustion in The Tio2–Al–C System: Structural and Mechanical Properties
Publication year - 2019
Publication title -
advances in materials science and engineering
Language(s) - English
Resource type - Journals
ISSN - 2578-7217
DOI - 10.33140/jamser.03.02.09
Subject(s) - materials science , sintering , ceramic , raman spectroscopy , titanium carbide , combustion , composite material , lattice constant , scanning electron microscope , tungsten , carbide , chemical engineering , diffraction , metallurgy , chemistry , physics , optics , engineering
The purpose of this work is to decrease or eliminate porosities in ETE-VC products with sintering additives. The Ti–C systemhas been synthesized for its advantages for refractory, abrasive and structural applications. We attempted to density TiC byusing iron addition; this metal is introduced through a secondary reaction 3TiO3+Al. This mixture reacts exothermicallyϪH298= -1072.7 kJ and the heat is released according to by Fe addition 3TiO3+4Al+3C+xFe→3TiC+2Al2O3+xFe. X-raydiffraction analysis indicated that intermetallic Fe3Al, TiC and Al2O3 are the main phases formed in the reinforced highperformance ceramic-matrix composites and the additions of Fe decreased the lattice parameter of TiC. Field emissionscanning electron microscopy examinations showed that the addition of Fe decreased TiC particle size and changed theirgrowth controlling mechanism. Also, Raman spectroscopy analysis showed that at higher Fe contents, oxygen dissolvedin the TiC crystal structure leading to the formation of titanium oxy-carbide with lower lattice parameter and residualun-reacted carbon in the products. The adiabatic temperatures for the reactions containing % Fe estimated using thethermodynamic data. Thus, doping method is finally used to fabricate materials by ETE-VC method (volume combustionmethod) for industriel applications.