Effect of suspension's ionic conductivity on electrophoretic deposition of h-BN

Samsudin, Shahrizal (2017) Effect of suspension's ionic conductivity on electrophoretic deposition of h-BN. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Hexagonal – Boron Nitride (h-BN) suspension used for Electrophoretic deposition (EPD) process is very sensitive to ionic conductivity. When the ionic conductivity of EPD suspension is high, the particle electrophoretic mobility becomes low due to the high concentration of free ions in the suspension. This results in a low deposition rate and the corresponding coating thickness is lower than the requirement of UL 1577 standard. Polycation is added as a binder for the h-BN particles so that the adherence and mechanical strength of h-BN coating is improved. Effectiveness of the polycation depends on the suspension processing parameters during and after the addition of polycation. Optimization of the processing parameters such as cleaning of the h-BN particles is needed to obtain low suspension’s ionic conductivity. h-BN suspension’s ionic conductivity functionalized with a polycation was successfully reduced by h-BN particles rinsing through filtration approach. h-BN particles functionalized using different concentration of polycation (0.3 wt%, 0.4 wt%, 0.5 wt% and 0.6 wt%) were prepared in two forms: (a) rinsed, (b) as - received particles to characterize the effect of h-BN suspension’s ionic conductivity on the h-BN coating thickness and yield. The main results showed that the h-BN suspension underwent rinsing process produced higher h-BN yield and thickness. The highest h-BN thickness was measured at 17.4 μm, deposited using rinsed h-BN particles added with 0.6 wt% polycation.

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