Wear resistance performance of high entropy alloy–ceramic coating composites synthesized via a novel combined process

doi:10.1016/j.cjche.2022.08.010

Chinese Journal of Chemical Engineering ›› 2023, Vol. 57 ›› Issue (5): 202-213.DOI: 10.1016/j.cjche.2022.08.010

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Wear resistance performance of high entropy alloy–ceramic coating composites synthesized via a novel combined process

Junyu Chen^1,2, Yu Yang^1,2, Yuzheng Pan^1,2, Yang You^1,2, Liwen Hu^1,2, Meilong Hu^1,2

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, China

Received:2022-01-26 Revised:2022-08-22 Online:2023-07-08 Published:2023-05-28
Contact: Yang You,E-mail:youyang@cqu.edu.cn;Meilong Hu,E-mail:hml@cqu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (52174299) and the Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, China.

Wear resistance performance of high entropy alloy–ceramic coating composites synthesized via a novel combined process

Junyu Chen^1,2, Yu Yang^1,2, Yuzheng Pan^1,2, Yang You^1,2, Liwen Hu^1,2, Meilong Hu^1,2

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, China

通讯作者: Yang You,E-mail:youyang@cqu.edu.cn;Meilong Hu,E-mail:hml@cqu.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (52174299) and the Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, China.

Abstract

Abstract: Titanium nitride (TiN), characterized by its high hardness and strength, was widely used as ceramic coating to improve the wear resistance of matrix materials. In this work, AlCrFeNiTi_x high-entropy alloy (HEA) powders were synthesized by direct electrochemical reduction in molten salt from the mixed metal oxides. Then, TiN ceramic coating on the AlCrFeNiTi_x bulk HEA containing the topologically close-packed (TCP) phase (σ phase, Laves phase, and Ti₃Al phase) was prepared by vacuum hot pressing sintering, where nitride element come from boron nitride parting agent sprayed on the graphite mold. The effect of titanium content on the crystal structure, microstructure, hardness, and wear resistance of the products were investigated by X-ray diffraction, field emission scanning electron microscope, field emission electron-probe microanalysis, Vickers hardness tester, and friction–abrasion testing machine. The bulk HEAs exhibit excellent hardness and its hardness increases significantly with the increase of titanium content. The wear mechanism changes from both of predominantly delamination and accompanied oxidative wear to single delamination wear, which is due to ultra-high melting point and high hot hardness of TiN, that can effectively prevent the oxidation and deformation of the worn surface. Formation of the ceramic coatings containing the TiN second phase and TCP phase are the key factor to AlCrFeNiTi_x alloy with the excellent hardness and wear properties.

Key words: High-entropy alloys, Electrochemical reduction, Vacuum hot pressing sintering, Hardness, Wear resistance

摘要： Titanium nitride (TiN), characterized by its high hardness and strength, was widely used as ceramic coating to improve the wear resistance of matrix materials. In this work, AlCrFeNiTi_x high-entropy alloy (HEA) powders were synthesized by direct electrochemical reduction in molten salt from the mixed metal oxides. Then, TiN ceramic coating on the AlCrFeNiTi_x bulk HEA containing the topologically close-packed (TCP) phase (σ phase, Laves phase, and Ti₃Al phase) was prepared by vacuum hot pressing sintering, where nitride element come from boron nitride parting agent sprayed on the graphite mold. The effect of titanium content on the crystal structure, microstructure, hardness, and wear resistance of the products were investigated by X-ray diffraction, field emission scanning electron microscope, field emission electron-probe microanalysis, Vickers hardness tester, and friction–abrasion testing machine. The bulk HEAs exhibit excellent hardness and its hardness increases significantly with the increase of titanium content. The wear mechanism changes from both of predominantly delamination and accompanied oxidative wear to single delamination wear, which is due to ultra-high melting point and high hot hardness of TiN, that can effectively prevent the oxidation and deformation of the worn surface. Formation of the ceramic coatings containing the TiN second phase and TCP phase are the key factor to AlCrFeNiTi_x alloy with the excellent hardness and wear properties.

关键词: High-entropy alloys, Electrochemical reduction, Vacuum hot pressing sintering, Hardness, Wear resistance

Junyu Chen, Yu Yang, Yuzheng Pan, Yang You, Liwen Hu, Meilong Hu. Wear resistance performance of high entropy alloy–ceramic coating composites synthesized via a novel combined process[J]. Chinese Journal of Chemical Engineering, 2023, 57(5): 202-213.

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Wear resistance performance of high entropy alloy–ceramic coating composites synthesized via a novel combined process

Wear resistance performance of high entropy alloy–ceramic coating composites synthesized via a novel combined process

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