空气-燃料超音速火焰喷涂Fe基非晶合金粒子沉积行为研究

The Fe-based amorphous alloys have great application prospects in industry field due to its ultra-high strength and excellent wear and corrosion resistances. However, Fe-based amorphous alloys are difficult to be widely used as a structural materials because of the size limitation. The high quality Fe-based amorphous alloy coating materials prepared by advanced thermal spraying technology can effectively overcome the size limitation problem and expand the application. In order to solve the problems of high porosity and low bonding strength during preparation of Fe-based amorphous alloy coating, this project will use the air-fuel supersonic spraying method to produce Fe-based amorphous alloy coating, the relationship between optimized spraying parameters and the characteristic of spraying gun will be established via computational fluid dynamics simulation. The splats formation and deposition mechanism of Fe-based amorphous alloy particles will be studied. The relationship between spraying technology and deposition behavior will be analyzed. High quality Fe-based amorphous alloy coating will be prepared based on the theory. The research in this project will provide strong theoretical guidance for the expending the application of Fe-based amorphous alloy coating.

具有高强度及优异的耐磨耐蚀性能的Fe基非晶合金在工业领域具有广阔的应用前景，然而由于玻璃形成尺寸的限制，Fe基非晶合金很难作为结构材料被大规模应用。采用先进的热喷涂技术制备Fe基非晶合金涂层，突破了非晶合金的尺寸限制，将有效的拓展Fe基非晶合金的应用范围。针对目前Fe基非晶合金涂层的孔隙率高和与基体结合强度低的问题，本项目拟基于空气-燃料超音速火焰喷涂技术，通过对喷枪的流体动力学模拟，建立喷涂参数与喷枪喷涂特性的关系，优化喷涂工艺参数，研究Fe基非晶合金粒子撞击到基体上的扁平化行为与粒子的沉积机理，建立喷涂工艺与粒子沉积行为的关系，获得高质量的Fe基非晶合金涂层，为促进Fe基非晶合金涂层材料的应用提供重要的理论依据。

Fe基非晶合金具有高强度及优异的耐磨耐蚀性能，在工业领域具有广阔的应用前景。但是由于其有限的玻璃形成尺寸，限制了Fe基非晶合金的大规模应用。采用空气激发超音速火焰喷涂技术制备Fe基非晶合金涂层，可以突破非晶合金的尺寸限制，拓展Fe基非晶合金的应用范围。本项目针对目前Fe基非晶合金涂层的孔隙率高、与基体结合强度低等问题，采用流体动力学数值模拟研究了空气激发超音速火焰喷涂的燃烧过程，获得了超音速火焰的流场和速度场，研究了工艺参数对Fe基非晶合金粉末颗粒的速度与温度的影响规律，提出了解决非晶合金粉末粘喷管问题的解决方案。探讨了超音速火焰喷涂Fe基非晶合金粒子的扁平化机理与沉积规律，提出了通过调控非晶合金粒子的扁平化沉积过程优化非晶合金涂层组织的方法。通过优化超音速火焰喷涂工艺参数，制备出了高质量的 Fe 基非晶合金涂层，研究表明Fe 基非晶合金涂层具有优异的的力学性能、耐蚀性能、摩擦磨损性能与高温耐蚀性能。本项目为Fe基非晶合金涂层的研究与应用提供了重要的理论依据。