NiCoCrAlYTa/TaC metal matrix composite coatings were prepared on single crystal superalloy (SX) using electrospark deposition (ESD) to improve its high temperature performance. The effect of TaC addition on the coating microstructure, oxidation behavior, wear resistance and physical properties of electrode were investigated. The results showed that, with the addition of TaC particles, the density of electrode increased, while the thermal conductivity and thermal diffusivity decreased. In the electrode, TaC particles were distributed around or embedded into the NiCoCrAlYTa powders, while in ESD coatings, they were distributed homogeneously in both dendrite cores and interdendritic regions. The generation of β-NiAl phase in ESD coating was prevented by adding TaC particles. During 1000 °C/100 h oxidation, the mass gain of coating with TaC addition was lower than that without TaC addition during the first 40 h, and then became higher. The oxidative products were similar, except that θ-Al₂O₃ was relatively more in coating without TaC, while Y₃Al₅O₁₂ was more in coating with TaC addition. The microhardness and wear resistance in both coatings decreased after oxidation, however, it was on the same level for NiCoCrAlYTa coating before oxidation and NiCoCrAlYTa/TaC coating after oxidation. Thus, the overall high temperature performance of the coatings was improved due to the addition of TaC particles.

使用电火花沉积（ESD）在单晶高温合金（SX）上制备NiCoCrAlYTa / TaC金属基复合涂层，以提高其高温性能。研究了TaC添加对涂层微观结构，氧化行为，耐磨性和电极物理性能的影响。结果表明，随着TaC颗粒的加入，电极的密度增加，而导热系数和热扩散系数降低。在电极中，TaC颗粒分布在NiCoCrAlYTa粉末周围或嵌入其中，而在ESD涂层中，它们均匀地分布在树枝状核和树枝状区域中。通过添加TaC颗粒可防止ESD涂层中β-NiAl相的产生。在1000°C / 100 h氧化过程中，在开始的40小时内，添加TaC的涂层的质量增益低于不添加TaC的涂层，然后变得更高。氧化产物相似，除了θ-Al不添加TaC的涂层中₂ O ₃相对较多，而添加TaC的涂层中Y ₃ Al ₅ O ₁₂较多。氧化后，两种涂层的显微硬度和耐磨性均下降，但是，氧化前的NiCoCrAlYTa涂层和氧化后的NiCoCrAlYTa / TaC涂层的显微硬度和耐磨性处于相同水平。因此，由于添加了TaC颗粒，涂层的整体高温性能得以改善。