Simultaneous synthesis and sintering of TiC/Al2O3 composite via self propagating synthesis with direct consolidation technique

Abstract

This manuscript presents the results of a study on the use of self propagating high temperature synthesis technique combined with direct consolidation for simultaneous synthesis and densification of TiC/Al 2 O 3 composite. The effects of both the mixing procedure of the starting reactant powders, and the addition of different mole fraction of alumina were investigated. The samples were characterized chemically, physically, and morphologically and their mechanical properties measured. It was found that changing the mixing procedure of the starting powders reduced the porosity of the combustion product from 24 to 7 vol%. On the other hand, the addition of 1.0 mol alumina was found to increase the porosity to 13 vol% and hence lower the mechanical properties. However, the addition of alumina resulted in samples with much better geometric definition and therefore this approach should be further investigated with optimized processing conditions.

Effect of zirconia and iron on the mechanical properties of Al2O3/TiC composites processed using combined self-propagating synthesis and direct consolidation technique

“…When the reaction was triggered (the temperature data logger recorded a sudden jump in the temperature), the required load was immediately applied (using motorized hydraulic press). Additional details of the experimental procedure are in [27].…”

“…The fabrication of TiC and its composite via SHS technique has been the topic of many investigations [15][16][17][18][19][20][21][22][23][24][25][26][27]. Al 2 O 3 -TiC composites were produced according to the exothermic reduction of TiO 2 with Al metal in the presence of carbon [18][19][20][21][22][23][24][25][26][27]. Although this composite material is characterized by attractive mechanical properties it suffer from low fracture toughness which limits its application in many practical fields [18,28].…”

Real-Time Measurement on the Heat Release Property of Titanium Blended with Different Carbon Allotropes, under Externally Constant Heat Flux

“…The porous and fluffy worm-like graphite mixed with the TiC appears in Figure 8d, and more dissociated and rugged fracture surface is observed in Figure 8e, due to the retarding effect of worm-like structures. Generally, the formation of TiC is examined and verified, but the high retained porosity is observed owing to its inherent limitation of combustion synthesis [25]. clean grain boundaries [22,23].…”

Titanium-based composite synthesis in the combustion regime

“…Authors [6] studied the physical and chemical phenomena in the reaction of TiO 2 , C, Al and the TiC/Alumina composite synthesis. Self sustaining high temperature synthesis (SHS) together with following disintegration is on of possible variant to obtain the powder systems with required structure for application for surface modification and object creation in additive technologies [7]. However irreversible conditions of the synthesis lead to the problems of theoretical and experimental character.…”