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首页> 外文期刊>Coatings >Effect of the Dispersion State in Y5O4F7 Suspension on YOF Coating Deposited by Suspension Plasma Spray
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Effect of the Dispersion State in Y5O4F7 Suspension on YOF Coating Deposited by Suspension Plasma Spray

机译：Y5O4F7悬浮在悬浮等离子体喷雾沉积YOF涂层对YOF涂层中的分散状态

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The stable Y5O4F7 suspension for dense yttrium oxyfluoride (YOF) coating by suspension plasma spraying (SPS) was developed. Electrostatically and electrosterically stabilized aqueous Y5O4F7 suspensions were prepared and compared with a commercially available Y5O4F7 suspension without dispersant. The wettability and dispersibility of the Y5O4F7 suspensions were evaluated in terms of the zeta potential, average particle size, and size distribution with electrophoretic light scattering (ELS) and dynamic light scattering (DLS). The viscosity was measured and the sedimentation was tested to examine the fluidity and stability of the Y5O4F7 suspensions. When electrostatic (BYK-154) and electrosteric (BYK-199) dispersants were added to the Y5O4F7 suspension, the isoelectric point (IEP) of Y5O4F7 particles in the suspension shifted to lower pH. The zeta potential of both of electrostatically and electrosterically stabilized Y5O4F7 suspensions were higher than ±40 mV at pH of 8.6, respectively, which were much higher than of the Y5O4F7 suspension without dispersant. Meanwhile, the average particle size of the electrosterically stabilized Y5O4F7 suspension was much smaller than that of the electrostatically stabilized one. The electrosteric stabilization had a great effect on improving the wettability and dispersibility of the Y5O4F7 suspension. The coating rate of the electrosterically stabilized Y5O4F7 suspension was the highest among the three tested suspensions. In addition, the YOF coating deposited with the electrosterically stabilized Y5O4F7 suspension had the highest hardness and the lowest porosity.
机译：开发了通过悬浮等离子体喷涂（SPS）的稳定Y5O4F7悬浮液（YOF）涂层的掺铬氧化钇（YOF）涂层。制备静电和正方形稳定的水性Y5O4F7悬浮液，并与商业上可获得的Y5O4F7悬浮液进行比较而没有分散剂。根据Zeta电位，平均粒度和具有电泳光散射（ELS）和动态光散射（DLS）的Zeta电位，平均粒度和尺寸分布评估Y5O4F7悬浮液的润湿性和分散性。测量粘度并测试沉降以检查Y5O4F7悬浮液的流动性和稳定性。当将静电（BYK-154）和静电（BYK-199）分散剂加入到Y5O4F7悬浮液中时，悬浮液中Y5O4F7颗粒的等电点（IEP）移至较低的pH值。静电和正方形稳定的Y5O4F7悬浮液的Zeta电位分别在8.6的pH下高于±40mV，其远高于Y5O4F7悬浮液而没有分散剂。同时，正方形稳定的Y5O4F7悬浮液的平均粒径远小于静静电稳定的悬浮液。能稳定性对改善Y5O4F7悬浮液的润湿性和分散性具有很大的效果。在三种测试的悬浮液中，正方形稳定的Y5O4F7悬浮液的涂层率最高。另外，沉积在正方形稳定的Y5O4F7悬浮液中的YOF涂层具有最高的硬度和最低孔隙率。

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