Electrophoretic deposition of ZrB<sub>2</sub> coatings in NaCl‐KCl‐AlF<sub>3</sub> melt containing synthesized ZrB<sub>2</sub> nanoparticles
Jie Pang, Qian Kou, Chuntao Ge, Lingling Xie, Weiliang Jin, Wenjuan Qi, Jun Zhang, Hongmin Zhu, Saijun Xiao
Abstract
Abstract A novel method for preparation of ZrB 2 coatings has been proposed by combination of molten salt synthesis of ZrB 2 nanoparticles and subsequent electrophoretic deposition of the as‐synthesized ZrB 2 nanoparticles in the same molten system in this paper. Nanoscale ZrB 2 particles have been produced by borothermal reduction of ZrO 2 in NaCl‐KCl‐AlF 3 melt at 980°C. Then electrophoretic deposition of the as‐synthesized ZrB 2 nanoparticles has been achieved in the resulting molten suspension at a reduced temperature of 900°C, yielding relatively dense ZrB 2 coatings on graphite substrates with a thickness of around 25 μm. Moreover, the effect of different cell voltages ranging from 0.8 V to 1.4 V (i.e., electric field 0.4–0.7 V/cm) on the prepared ZrB 2 coatings has been investigated. Finally, during the tests at 600°C–800°C in air, ZrB 2 coatings deposited at a cell voltage of 1.2 V have exhibited good high‐temperature oxidation resistance.