Analytical Determination of the Effective Thermal Conductivity of Heterophase Surface Layers, Coatings, and Thin Films in Heavy-Loaded Tribosystems

IF 0.5 4区工程技术 Q4 ENGINEERING, MECHANICAL

Journal of Friction and Wear Pub Date : 2023-03-13 DOI:10.3103/S1068366622060071

V. I. Kolesnikov, O. V. Kudryakov, I. V. Kolesnikov, V. N. Varavka, L. P. Aref’eva, A. I. Voropaev, E. S. Novikov

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Abstract—

The aim of the study was to create a technique for calculating the thermal conductivity of a thin surface layer or coating, which differs significantly from the base metal in structure, phase composition, and thermal properties. The technique is based on the experimental measurement of the contact potential difference (CPD) at the layer/coating–substrate interface, followed by the calculation of the electron work function and the energy of the Fermi level. Distinctive features of the developed methodological apparatus are the characteristics of the microstructure, phase composition, and porosity of the layer/coating, which are taken into account in the calculation model and significantly affect the final result of determining the effective thermal conductivity. The calculation and experimental approbation of the idea was implemented in the process of studying the blades of an experimental gas turbine locomotive engine with a heterophase thermal barrier coating of the Nb–Ti–Al system. The material of the blades is Inconel 713LC cast chromium–nickel superalloy. Coatings with a thickness of about 80 µm were deposited using the vacuum ion-plasma technology. During the development of the methodology for calculating the thermal conductivity, the experimental data of the CPD were obtained by instrumental measurements according to a specially developed laboratory procedure. Data on the morphology of the structure of coatings, their phase composition, and porosity were studied by traditional metal-physical methods and integrated into the calculation part of the technique. The results of model calculations of the thermal conductivity of both the base metal of the substrate (turbine blades) Inconel 713LC and the Nb–Ti–Al thermal barrier coating showed a high agreement with experimental and reference data. The technology has a high potential for application in heavily loaded friction units in various areas of the national economy, such as helicopter construction, aircraft construction, aerospace, railway transport, shipbuilding, and defense.

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重载摩擦系统中异相表面层、涂层和薄膜的有效热导率的分析测定

摘要:本研究的目的是创建一种计算薄表面层或涂层导热系数的技术，薄表面层或涂层在结构、相组成和热性能上与母材有很大不同。该技术基于层/涂层-衬底界面处接触电位差(CPD)的实验测量，然后计算电子功函数和费米能级的能量。所开发的方法装置的显著特征是层/涂层的微观结构、相组成和孔隙率的特征，这些特征在计算模型中被考虑，并显著影响确定有效导热系数的最终结果。通过对某实验型燃气轮机机车叶片采用Nb-Ti-Al体系异相热障涂层的研究，对该思想进行了计算和实验验证。叶片材料为英科乃尔713LC铸造铬镍高温合金。采用真空离子等离子体技术沉积厚度约为80 μ m的涂层。在计算热导率方法的发展过程中，CPD的实验数据是根据专门开发的实验室程序通过仪器测量获得的。通过传统的金属物理方法研究了涂层的结构形态、相组成和孔隙率，并将其纳入该技术的计算部分。对基材(涡轮叶片)Inconel 713LC和Nb-Ti-Al热障涂层的导热系数进行了模型计算，结果与实验和参考数据吻合较好。该技术在直升机制造、飞机制造、航空航天、铁路运输、造船、国防等国民经济各个领域的重载摩擦装置上具有很大的应用潜力。

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

Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

1.50

自引率

28.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.