Tribological performance evaluation of YSZ-NiCrAlY gradient materials by tribometer and nanoscratch

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International Pub Date : 2024-10-01 DOI:10.1016/j.triboint.2024.110292

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Abstract

The tribological properties of ceramic coating often fall short of expectations because of their inherent brittleness and internal microcracking and weak bonding strength. Gradient materials containing different Yttrium oxide stabilized zirconia ceramics (YSZ) and NiCrAlY were prepared at 1050 °C using discharge plasma sintering technique. Two interlayers consisting of different content of YSZ and NiCrAlY was located between the top YSZ and the NiCrAlY substrate, and the layers obtain good bonding. The microstructure and tribological properties of the ZrO₂-based gradient-structured material were investigated. The element distribution on the surface of the sample after sintering was relatively homogeneous without obvious segregation. Nanoscratch tests indicate that the YSZ based layer obtains high coefficient of friction than the NiCrAlY layer. The tribological results suggested that the coefficient of friction decreases gradually with the increase of load, adhesive wear and oxidative wear were the main wear mechanisms, the formed oxidized layer rich of Zr and Ag contribute to the reduced coefficient of friction under different loads.

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通过摩擦磨损仪和纳米划痕评估 YSZ-NiCrAlY 梯度材料的摩擦学性能

由于陶瓷涂层固有的脆性、内部微裂纹和较弱的结合强度，其摩擦学性能往往达不到预期。采用放电等离子烧结技术，在 1050 °C 下制备了含有不同氧化钇稳定氧化锆陶瓷（YSZ）和 NiCrAlY 的梯度材料。由不同含量的 YSZ 和 NiCrAlY 组成的两层夹层位于顶部的 YSZ 和 NiCrAlY 基底之间，两层之间具有良好的结合力。研究了基于 ZrO2 的梯度结构材料的微观结构和摩擦学性能。烧结后样品表面的元素分布相对均匀，无明显偏析。纳米划痕测试表明，YSZ 基层比 NiCrAlY 层获得更高的摩擦系数。摩擦学结果表明，摩擦系数随载荷的增加而逐渐降低，粘着磨损和氧化磨损是主要的磨损机制，所形成的富含 Zr 和 Ag 的氧化层有助于降低不同载荷下的摩擦系数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tribology International 工程技术-工程：机械

CiteScore

10.10

自引率

16.10%

发文量

627

审稿时长

35 days

期刊介绍： Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International. Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.