袁建鹏,于月光,沈婕.等离子喷涂 Ni3Al-Cr7C3 涂层的滑动磨损性能[J].热喷涂技术,2021,13(2):37~47.
等离子喷涂 Ni3Al-Cr7C3 涂层的滑动磨损性能
Study on the Sliding Wear Performance of Plasma SprayNi3Al-Cr7C3 Coatings
  
DOI:10.3969/j.issn.1674-7127.2021.02.005
中文关键词:  金属陶瓷  Ni3Al-Cr7C3  原位自生  等离子喷涂  显微形貌  摩擦磨损
英文关键词:Metal-ceramics  Ni3Al-Cr7C3  In situ  Atmospheric plasma spray  Micromorphology  Friction and wear
基金项目:
        
作者单位
袁建鹏 东北大学, 矿冶科技集团有限公司,特种涂层材料与技术北京市重点实验室
于月光 东北大学,中国钢研科技集团有限公司
沈婕 矿冶科技集团有限公司,特种涂层材料与技术北京市重点实验室
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中文摘要:
      利用 Ni3Al 具有反常高温屈服强度的特性, 采用真空雾化工艺制备了不同 C 含量的 Ni3Al-Cr7C3 金属陶瓷 复合粉末, 采用大气等离子喷涂 (APS) 制备出原位自生 Cr7C3 相的新型 Ni3Al-Cr7C3 涂层, 并对粉末、 涂层的物相 组成、 显微组织及摩擦磨损性能进行了研究。 结果表明: 研制的粉末主要由 Ni3Al 相和弥散分布的条状的 Cr7C3 相组成, 且随着 C 含量的增加 Cr7C3 的体积百分比增加, 粉末硬度也随之增加, C 含量为 4 wt.% 的 Ni3Al-Cr7C3 粉末硬度比纯 Ni3Al 粉末增加了 1 倍以上。 研制涂层微观结构及物相组成与粉末基本一致, 4 wt.% 及以下碳含量 的涂层的硬度随C含量的增加而增加, APS制备的5 wt.% 碳含量涂层结合强度仅为6.7 MPa, 不适合用于耐磨防护; 4 wt.% 及以下碳含量的涂层结合强度基本不受 C 含量影响。 室温下, 随着碳含量的增加, 涂层的磨损量减小, 4 wt.% 碳含量 Ni3Al-Cr7C3 涂层的磨损量小于 NiCr-Mo-Cr3C2 涂层。 350℃ 摩擦磨损实验中 4 wt.% 碳含量 Ni3AlCr7C3 涂层的摩擦系数和磨损质量损失分别为 0.39 和 1.27 mg, 均小于 NiCr-Mo-Cr3C2 涂层在同实验条件下的测试 值; 不同温度下硬度测试结果显示 Ni3Al-Cr7C3 涂层的硬度随温度升高降低缓慢, 在 500℃左右出现拐点, 500℃ 后硬度随温度升高不降反升。
英文摘要:
      Taking advantage of the abnormal high temperature yield strength of Ni3Al, Ni3Al-Cr7C3 metal-ceramics powders with different volume percentages of Cr7C3 phase were prepared by vacuum atomization. The Ni3Al-Cr7C3 coating with in-situ synthesized Cr7C3 phase was prepared by air plasma spraying (APS). The microstructure, phase composition and carbide distribution of powder and coatings has been investigated. The results showed that the powder is mainly composed of Ni3Al phase and dispersed strip Cr7C3 phase. With the increase of C content the volume percentage of Cr7C3 and the hardness of the powder both increased. The hardness of the Ni3AlCr7C3 powder with 4 wt.% C content was twice than that of pure Ni3Al powder. The microstructure and phase composition of the coating were basically the same as that of the powder. The hardness of the coating with 4 wt.% or less carbon content increased with the increasing of C content. The bonding strength of the coating with 5wt.% carbon content prepared by APS was only 6.7 MPa, which was not suitable for wear protection. However, the bonding strength of the coating with 4 wt.% carbon content or less didn't affected by carbon content. At room temperature, the wear loss of Ni3Al-Cr7C3 coating decreased with the increase of carbon content. The wear loss of Ni3Al-Cr7C3 coating with 4 wt.% carbon content was less than that of NiCr-Mo-Cr3C2 coating. At 350℃ friction and wear test, the friction coefficient and wear loss of Ni3Al-Cr7C3 coating with 4 wt.% carbon contents were 0.39 mg and 1.27 mg, respectively, which were less than those of NiCr-Mo-Cr3C2 coating under the same experimental conditions. The hardness test results at different temperatures showed that the hardness of Ni3Al-Cr7C3 coating decreased slowly with the increase of temperature, the inflection point appeared at about 500℃ , and after 500℃ , the hardness increases with the increase of temperature instead of decreasing.
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