Improving the properties of remanufactured wear parts of shield tunneling machines by novel Fe-based composite coatings. Issue 5 (1st March 2022)

• Record Type: Journal Article
• Authors: Qi, Xiaoxia; Li, Yanle; Li, Fangyi; Du, Jiyu; Li, Cheng; Wang, Kaian; Lu, Haiyang; Yang, Baojuan
• Is Part Of: Ceramics international. Volume 48:Issue 5(2022)
• Page Start: 6722
• Page End: 6733
• Publication Date: 2022-03-01
• Subjects: Laser cladding -- Microstructure -- Morphology -- Dispersion -- TiC particles -- Wear resistance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.11.223
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: With the aim of remanufacturing high-value wear parts of shield tunneling machines, novel Fe-based composite coatings were prepared by collaborative modification with nano-TiC and nano-CeO2 particles. This work aims to improve the wear properties of Fe-based alloy coatings by regulating the morphology and dispersion of TiC through the addition of different contents of nano-TiC and nano-CeO2 . First, the coatings with different contents of nano-TiC (from 5 wt% to 15 wt%) and nano-CeO2 (from 1 wt% to 2 wt%) were prepared by laser cladding. Subsequently, the microstructure, phase composition, microhardness, and wear properties of the coatings were examined. Furthermore, the wear morphology and the influence mechanism of nano-particles on the wear resistance of the coatings were investigated. It was found that the addition of nano-TiC eliminates the macro-defects of Fe55 alloy coating. Meanwhile, the morphology and dispersion of TiC particles in coatings were affected by the content of nano-TiC and nano-CeO2 . Specifically, the addition of 1 wt% nano-CeO2 facilitates to the formation of near-spherical tiny TiC particles with low agglomeration in the coating. Therefore, the Fe55 + 10 wt% nano-TiC+1 wt% nano-CeO2 coating exhibits the best wear property among all the prepared Fe-based coatings. This paper provides theoretical guidance for the preparation of the modified Fe-based coating with excellent wear resistance.