TY - JOUR
T1 - Electrophoretic deposition of Ti 3 SiC 2 and texture development in a strong magnetic field
AU - Mishra, Mrinalini
AU - Sakka, Yoshio
AU - Hu, Chungfeng
AU - Suzuki, Tohru S.
AU - Uchikoshi, Tetsuo
AU - Besra, Laxmidhar
PY - 2012/9
Y1 - 2012/9
N2 - In this study,we have shown the applicability of electrophoretic deposition (EPD) for shape-forming in Ti 3SiC 2-a representative MAX phase; and viability of texture development thereof by application of a strong magnetic field (12 T). The dispersion characteristics of Ti 3SiC 2 suspension were investigated in terms of surface charge, rheological measurement, and adsorption study. Polyethyleneimine has been used as dispersant to stabilize the suspension. It was found that the iso-electric point (IEP) of Ti 3SiC 2 powder was pH IEP ∼ 4. The surface charge of powder changed in presence of the Polyethyleneimine dispersant and IEP shifted significantly towards basic pH ∼ 10. The shift in IEP has been quantified in terms of ΔG 0 SP, the specific free energy of adsorption between the surface sites and the adsorbing polyelectrolyte (PEI) (The value of ΔG 0 SP obtained is -9.521 RT units). The optimized suspension parameters for EPD were determined as 10 vol% Ti 3SiC 2 and 1 dwb PEI in 50% ethanolic water at pH ∼ 7. X-ray diffraction analysis of the textured samples developed, revealed that the preferred orientation of Ti 3SiC 2 grains parallel to the magnetic field direction was along the a, b-axis (The Lotgering orientation factors on the textured top surface and textured side surface were determined as f L(hk0) = 0.35 and f L(00l) = 0.75, respectively).
AB - In this study,we have shown the applicability of electrophoretic deposition (EPD) for shape-forming in Ti 3SiC 2-a representative MAX phase; and viability of texture development thereof by application of a strong magnetic field (12 T). The dispersion characteristics of Ti 3SiC 2 suspension were investigated in terms of surface charge, rheological measurement, and adsorption study. Polyethyleneimine has been used as dispersant to stabilize the suspension. It was found that the iso-electric point (IEP) of Ti 3SiC 2 powder was pH IEP ∼ 4. The surface charge of powder changed in presence of the Polyethyleneimine dispersant and IEP shifted significantly towards basic pH ∼ 10. The shift in IEP has been quantified in terms of ΔG 0 SP, the specific free energy of adsorption between the surface sites and the adsorbing polyelectrolyte (PEI) (The value of ΔG 0 SP obtained is -9.521 RT units). The optimized suspension parameters for EPD were determined as 10 vol% Ti 3SiC 2 and 1 dwb PEI in 50% ethanolic water at pH ∼ 7. X-ray diffraction analysis of the textured samples developed, revealed that the preferred orientation of Ti 3SiC 2 grains parallel to the magnetic field direction was along the a, b-axis (The Lotgering orientation factors on the textured top surface and textured side surface were determined as f L(hk0) = 0.35 and f L(00l) = 0.75, respectively).
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U2 - 10.1111/j.1551-2916.2012.05296.x
DO - 10.1111/j.1551-2916.2012.05296.x
M3 - Article
AN - SCOPUS:84865759825
SN - 0002-7820
VL - 95
SP - 2857
EP - 2862
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 9
ER -