Improved hardness and wear resistance of plasma sprayed nanostructured NiCrBSi coating via short-time heat treatment
Improved hardness and wear resistance of plasma sprayed nanostructured NiCrBSi coating via short-time heat treatment
复制标题
通过短时间热处理提高等离子喷涂纳米结构 NiCrBSi 涂层的硬度和耐磨性
DOI：
10.1016/j.surfcoat.2018.07.037
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发表时间：
2018-09-25
影响因子：
5.4
通讯作者：
Zhang, Lai-Chang
中科院分区：
文献类型：
--
作者：
Chen, Liang-Yu;Xu, Tianxiang;Zhang, Lai-Chang
在440度C，460摄氏度和480摄氏度中，将通过大气等离子体喷雾技术沉积的NICRBSI合金涂层分别加热了短期C，以更好地了解其微结构和性质之间的关系。进行了光学显微镜，扫描电子显微镜，X射线衍射，透射电子显微镜和摩擦学测试，以评估涂料的显微结构和磨损性能。涂料的硬度和磨损性在短时热处理的初始阶段增加，然后减少。经过热处理的涂层比弹药型涂层高15.4％，最小磨损量高60％。 Spray的NICRBSI涂层具有主要由结晶相和无定相（约10 vol％）组成的混合微观结构。在480度C下进行3分钟的热处理后，无定形相的体积分数降至1.6 vol％，而化合物（例如Ni3b和Cr3b4）的馏分和伽马NI的分数相应增加。 NI3B和CR3B4的沉淀物负责涂料的硬化。随着热处理的进行，γ-Ni谷物粗糙，导致涂料的硬度和磨损性的趋势偏僻。由于涂料的磨料模式在短时热处理后没有变化，因此涂料的硬度在涂料的耐磨性中起主要作用。
NiCrBSi alloy coatings deposited by atmospheric plasma spray technology were heated at 440 degrees C, 460 degrees C, and 480 degrees C for a short-time respectively to achieve a better understanding of the relationship between their microstructures and properties. Optical microscopy, scanning electron microscopy, X-ray diffraction, transmission electron microscopy and tribological tests were conducted to evaluate the microstructures and wear performance of the coatings. Both the hardness and wear resistance of the coatings increase at the initial stage of short-time heat treatment followed by decreasing. The heat-treated coatings show 15.4% higher maximum hardness and 60% lower minimum wear volume than the as-sprayed one. The as-sprayed NiCrBSi coating possesses a mixed microstructure mainly composed of the crystalline phases and the amorphous phase (about 10 vol%). After 3 min heat treatment at 480 degrees C, the volume fraction of the amorphous phase decreases to 1.6 vol%, while the fractions of compounds (such as Ni3B and Cr3B4) and gamma-Ni increase correspondingly. The precipitates of Ni3B and Cr3B4 are responsible for the hardening of the coatings. As heat treatment proceeds, the gamma-Ni grains coarsen, leading to a deceasing tendency in the hardness and wear resistance of the coatings. As the abrasive modes of the coatings are not varied after short-time heat treatment, the hardness of the coatings plays a dominant role in the wear resistance of the coatings.