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采用液相等离子喷涂(SPPS)方法制备了SrZrO_3热障涂层(TBCs)。采用田口实验法(Taguchi method)研究了喷涂电流、氩气流量、氢气流量等主要喷涂工艺参数对涂层沉积效率、硬度、显微结构、相稳定性的影响规律。分别采用XRD,SEM和显微硬度计研究了涂层的相组成、显微结构和硬度。结果表明:在喷涂距离、送液速率、雾化压力一定的情况下,当喷枪电流为600 A、氩气流量为40 L/min、氢气流量为10 L/min条件下,涂层的沉积效率最高,熔化程度最好,单遍喷涂厚度达到6.0μm,涂层孔隙率为16.3%,硬度为6.8 GPa。相稳定性研究表明,1450℃下随着热处理时间的延长,涂层中t-ZrO_2相逐渐向m-ZrO_2相转变,SrZrO_3相稳定性良好。
SrZrO_3 thermal barrier coatings (TBCs) were prepared by liquid-phase plasma spraying (SPPS). Taguchi method was used to study the effects of main spraying parameters such as spraying current, argon flow and hydrogen flow on the deposition efficiency, hardness, microstructure and phase stability of the coatings. The phase composition, microstructure and hardness of the coatings were investigated by XRD, SEM and microhardness tester respectively. The results show that the deposition efficiency of the coating under the condition of the spray gun current of 600 A, the argon gas flow rate of 40 L / min and the hydrogen flow rate of 10 L / min under the condition of spray distance, liquid feeding rate and atomization pressure. The highest, the best degree of melting, single-pass spraying thickness of 6.0μm, coating porosity of 16.3%, a hardness of 6.8 GPa. The phase stability studies show that the t-ZrO_2 phase in the coating gradually changes to m-ZrO_2 phase and the phase stability of SrZrO_3 is good at 1450 ℃ with the extension of heat treatment time.