爆炸和超音速火焰喷涂MCrAlYX涂层的显微结构、力学性能及抗氧化特性（英文）

发布时间：2018-09-18 19:46

【摘要】：对爆炸(D-gun)和超音速火焰喷涂(HVOF)MCrAlYX涂层的显微结构、力学性能和抗氧化性能进行研究。结果表明,D-gun涂层呈现片层显微结构,而HVOF涂层呈现均匀结构。同时,在爆炸喷涂过程中发生了元素重新分布以及新相的形成。此外,D-gun涂层的孔隙率明显低于HVOF涂层的。在力学性能方面,2种涂层的显微硬度在同一水平(均在HV 910左右),但由于D-gun涂层的片层显微结构及不同相组成,其纤维硬度的标准偏差明显高于HVOF涂层的。由于涂层颗粒及片层之间存在大量的残余压应力,所以,D-gun涂层的弯曲结合强度明显高于HVOF涂层的。高温氧化实验结果表明,D-gun制备的MCrAlYX涂层的抗氧化性能更优异,因为D-gun涂层更致密,使其表面能够尽早地形成连续致密的氧化保护层,从而进一步抑制氧化并控制氧化膜的厚度较小。
[Abstract]:The microstructure, mechanical properties and oxidation resistance of explosive (D-gun) and supersonic flame sprayed (HVOF) MCrAlYX coatings were studied. The results show that the D-gun coating exhibits a lamellar microstructure, while the HVOF coating exhibits a uniform structure. At the same time, the element redistribution and the formation of new phase occurred in the process of explosive spraying. In addition, the porosity of D-gun coating is obviously lower than that of HVOF coating. In terms of mechanical properties, the microhardness of the two coatings is at the same level (about HV 910), but the standard deviation of the fiber hardness of the D-gun coating is obviously higher than that of the HVOF coating due to the microstructure of the coating and the composition of the different phases. Due to the existence of a large amount of residual compressive stresses between the coating particles and the lamellar layer, the bending bonding strength of the D-gun coating is obviously higher than that of the HVOF coating. The results of high temperature oxidation test show that the oxidation resistance of MCrAlYX coating prepared by D-gun is better because the D-gun coating is denser, which enables the surface to form a continuous and compact oxidation protection layer as soon as possible. Thus the oxidation is further inhibited and the thickness of the oxide film is controlled.
【作者单位】：北京航空材料研究院金属腐蚀与表面防护实验室;
【基金】：Project(51201156)supported by the National Natural Science Foundation of China
【分类号】：TG174.4

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