以内送粉和外送粉两种方式微弧等离子喷涂工艺制备了NiCrAlY/Al2O3复合涂层,分析了送粉方式对涂层相组成、微观结构和介电性能的影响.结果表明:与外送粉相比,内送粉方式沉积的涂层具有较高的沉积效率和较低的孔隙率.由于喷涂过程中α-Al2 O3颗粒完全熔融,内送粉喷涂所得到涂层主要为γ/γ'和γ-Al2O3相,并且涂层结构致密,NiCrAlY颗粒分布均匀.介电性能测试表明,以外送粉方式制备的涂层复介电常数实部和虚部几乎不随频率发生变化.而以内送粉方式喷涂的涂层复介电常数实部和虚部随频率的增加而降低,呈现明显的频散现象.
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