冷喷涂和等离子喷涂Fe基非晶涂层特征对比研究

Comparative Study on the Characteristics of Fe-Based Amorphous Coatings for Cold Spraying and Plasma Spraying

采用传统热喷涂方法制备非晶涂层存在晶化度高和孔隙率高两个主要缺点,而新兴的冷喷涂技术具有解决这两个缺点的潜力。本文通过对比等离子喷涂和冷喷涂铁基非晶涂层的性能特征,探讨冷喷涂技术在非晶涂层应用方面的可行性。研究表明,冷喷涂涂层中含有更高的非晶含量,氧化程度更低,且结合强度高达27 MPa。随着热处理温度的升高,冷喷涂涂层在700℃下开始发生晶化,不断析出晶化相,涂层变得更加致密,微观形貌中无裂纹出现,显微硬度由喷涂态的1150 HV增加到1400 HV。而等离子喷涂涂层在600℃就已经发生晶化,且有裂纹出现。因此,冷喷涂涂层的机械性能优于等离子喷涂涂层,冷喷涂涂层的整体性能更好,应用冷喷涂制备非晶合金涂层有更大的潜力。

The preparation of amorphous coatings by traditional thermal spraying method has two main shortcomings like high crystallization degree and porosity,and the new cold spraying technology has the potential to solve these two shortcomings.In this paper,the feasibility of cold spraying technology in the application of amorphous coatings is discussed by comparing the properties of plasma sprayed and cold sprayed iron based amorphous coatings.The results show that the cold sprayed coating contains higher amorphous content,lower oxidation degree and higher bonding strength of 27 MPa.With the increase of heat treatment temperature,the cold spraying coating began to crystallization at 700℃,and the crystallization phase was precipitated continuously,the coating became more compact,no cracks appeared in the micromorphology,and the microhardness increased from sprayed 1150 HV to 1400 HV.However,the plasma sprayed coating has been crystallized at 600℃,and cracks have appeared.Therefore,the mechanical properties of cold sprayed coatings are better than those of plasma sprayed coatings,and the overall properties of cold sprayed coatings are better than those of plasma sprayed coatings.The preparation of amorphous alloy coatings by cold spraying has greater potential.