The effect of TiO2 additive on sinterability and properties of SiC-Al2O3-Y2O3 composite system

Development of spark plasma sintered conductive SiC–TiB2 composites for electrical discharge machining applications

“…was reported in research studies while sintering of SiC using other sintering techniques and amounts of additives 32,35 . A slight improvement in the sintered density of TiB 2 ‐contained samples (refer Table 1) is because of the effect of native TiO 2 in forming Y—Ti—Si—Al–OCN and TiC, as also observed by other researchers 33,36–38 . The formation of trace TiC phase is thermodynamically feasible (i.e., Δ G < 0) as per the reactions () and () confirmed in many studies 36–38 …”

“…32,35 A slight improvement in the sintered density of 1) is because of the effect of native TiO 2 in forming Y-Ti-Si-Al-OCN and TiC, as also observed by other researchers. 33,[36][37][38] The formation of trace TiC phase is thermodynamically feasible (i.e., ΔG < 0) as per the reactions (3) and ( 4) confirmed in many studies. [36][37][38] TiO 2 + SiC → TiC + SiO 2…”

“…33,[36][37][38] The formation of trace TiC phase is thermodynamically feasible (i.e., ΔG < 0) as per the reactions (3) and ( 4) confirmed in many studies. [36][37][38] TiO 2 + SiC → TiC + SiO 2…”

“…As per the thermodynamic calculations, Gibbs free energy is negative for the reaction (3) in the range of ambient to the sintering temperature 20,36 and reaction (4) above 1700 • C. 37,38 Figure 3 shows typical SEM-back scattered electron (BSE) images of sintered S0T, S10T, S20T, and S30T composites and EDS analysis of S10T composite. In general, SEM-BSE images reveal three distinct dark, light gray, and bright phases.…”

Effect of in situ VSi2 and SiC phases on the sintering behavior and the mechanical properties of HfB2-based composites

“…1. It has been reported that diffusion rate and porosity mobility are enhanced by increasing the sintering temperature which finally causes the reduction of cavities in the sintered composite 35 . The very small amount of porosity is observed in the microstructure after the sintering process which confirms that the temperature of the sintering process (~ 2150 °C) was adequate to remove most of the porosities.…”