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冷喷涂铁基非晶复合涂层的制备及摩擦性能研究
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西安建筑科技大学冶金工程学院

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国家自然科学基金(51801143);陕西省自然科学基金(2017JZ012);陕西省教育厅专项(18JK0445)


Study on the Preparation, Microstructure and Friction properties of Cold Sprayed Fe-based Amorphous Composite Coating
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College of Metallurgy Engineering,Xi’an University of Architecture and Technology,Xi’an

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    摘要:

    非晶合金拥有独特的短程有序、长程无序原子排列结构,具有高强度、高硬度及优异的耐腐蚀和耐磨损等性能,在防护涂层领域具有很强的应用潜力。以低温固态沉积为特点的冷喷涂层制备技术,可有效避免喷涂过程中非晶合金材料的氧化和晶化问题,但是冷喷涂技术严重依赖于粉末的塑性变形能力。为提高非晶合金颗粒在高速撞击下的沉积变形性能,本论文创新采用液氮-常温循环深冷处理工艺方法对Fe87.4Cr2.5Si6.8B2.4C0.9非晶合金粉末进行预处理,通过调控冷喷涂工艺参数,成功在6061铝合金基体表面制备非晶涂层。同时研究了深冷处理工艺对非晶粉末沉积行为以及涂层微观组织的影响机理,通过摩擦磨损试验研究非晶合金涂层的摩擦磨损性能。结果表明:使用原始非晶粉末制备得到的涂层厚度仅为6μm,且非晶颗粒在基体表面不连续分布,只有粒径较小的非晶颗粒可发生有效的塑性变形,但是粉末沉积过程中晶化率较低;使用经过深冷预处理的非晶粉末制备的涂层平均厚度为67μm,且涂层内非晶合金颗粒分布均匀,粒径较大的非晶颗粒也可发生有效塑性变形,但是粉末沉积过程中晶化率较高。在摩擦磨损过程中6061铝合金基体的主要磨损机制为粘着磨损与疲劳磨损,非晶涂层的主要磨损机制为磨粒磨损,且使用原始非晶粉末和循环深冷处理粉末制备得到的非晶涂层的质量磨损量较低,分别为6061铝合金基体质量磨损量的15.7%、11.8%。

    Abstract:

    Amorphous alloy has a unique short-range ordered, long-range disordered atomic arrangement structure, with high strength, high hardness and excellent corrosion and wear resistance and other properties, has a strong application potential in the field of protective coating. The preparation technology of cold spraying layer, which is characterized by low temperature solid deposition, can effectively avoid the oxidation and crystallization of non-crystalline alloy materials in the spraying process, but the cold spraying technology depends heavily on the plastic deformation ability of powder. In order to improve the deposition and deformation performance of amorphous alloy particles under high speed impact, this paper innovated the liquid nitrogen-room temperature cycle cryogenic treatment method to pretreatment the Fe87.4Cr2.5Si6.8B2.4C0.9 amorphous alloy powder, and prepared the embedded composite coating of amorphous alloy particles on the 6061 aluminum alloy substrate surface by adjusting the technological parameters of cold spraying. The influence mechanism of cryogenic treatment on the deposition behavior of amorphous powder and the microstructure of coating was studied. The results showed that the coating thickness was only 6μm, and the amorphous particles were discontinuously distributed on the surface of the substrate. Only the amorphous particles with smaller particle size could have effective plastic deformation, but the crystallization rate was low during the deposition of the powder. The average thickness of the coating prepared by cryogenic amorphous powder was 67μm, and the amorphous alloy particles in the coating were uniformly distributed. The amorphous particles with larger particle size could also undergo effective plastic deformation, but the crystallization rate was higher during the powder deposition.6061 aluminum alloy substrate in the process of friction and wear of the main wear mechanism is adhesive wear and fatigue wear. Amorphous coating, the main wear mechanism of abrasive wear and use the original amorphous powder and cycle cryogenic processing powder preparation of amorphous coating is low, the quality of the wear of 6061 aluminum alloy substrate respectively quality wear rate of 15.7%, 11.8%.

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李旭,王强,牛文娟,毛轩,王璐,李洋洋,王永刚,杨驹.冷喷涂铁基非晶复合涂层的制备及摩擦性能研究[J].稀有金属材料与工程,2021,50(6):2186~2193.[Li Xu, Wang Qiang, Niu Wenjuan, Mao Xuan, Wang Lu, Li Yangyang, Wang Yonggang, Yang Ju. Study on the Preparation, Microstructure and Friction properties of Cold Sprayed Fe-based Amorphous Composite Coating[J]. Rare Metal Materials and Engineering,2021,50(6):2186~2193.]
DOI:10.12442/j. issn.1002-185X.20200543

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  • 收稿日期:2020-07-27
  • 最后修改日期:2020-10-16
  • 录用日期:2020-10-22
  • 在线发布日期: 2021-07-07
  • 出版日期: 2021-06-30