Table of Contents Author Guidelines Submit a Manuscript
Advances in Materials Science and Engineering
Volume 2014 (2014), Article ID 836739, 11 pages
http://dx.doi.org/10.1155/2014/836739
Research Article

Microstructural Characterization and Wear Properties of Fe-Based Amorphous-Crystalline Coating Deposited by Twin Wire Arc Spraying

1Centro de Investigación en Materiales Avanzados, S.C. Unidad Monterrey, Alianza Norte 202, 66600 Apodaca, NL, Mexico
2Universidad Autónoma de Nuevo León, Facultad de Ingeniería Mecánica y Eléctrica, Centro de Investigación e Innovación en Ingeniería Aeronáutica, Carretera a Salinas Victoria km 2.3, 66600 Apodaca, NL, Mexico
3Centro de Investigación y de Estudios Avanzados del IPN, Unidad Saltillo, Avenida Industria Metalúrgica 1062, 25900 Ramos Arizpe, COAH, Mexico
4Instituto Tecnológico de Celaya, A. García Cubas S/N A.P. 57, 38010 Celaya, GTO, Mexico
5Corporación Mexicana de Investigación en Materiales, S.A. de C.V., Ciencia y Tecnología 790 Fracc. Saltillo 400, 25260 Saltillo, COAH, Mexico

Received 10 June 2014; Revised 10 September 2014; Accepted 25 September 2014; Published 20 October 2014

Academic Editor: Jörg M. K. Wiezorek

Copyright © 2014 Ana Arizmendi-Morquecho et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Twin wire arc spraying (TWAS) was used to produce an amorphous crystalline Fe-based coating on AISI 1018 steel substrate using a commercial powder (140MXC) in order to improve microhardness and wear properties. The microstructures of coating were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) as well as the powder precursor. Analysis in the coating showed the formation of an amorphous matrix with boron and tungsten carbides randomly dispersed. At high amplifications were identified boron carbides at interface boron carbide/amorphous matrix by TEM. This kind of carbides growth can be attributed to partial crystallization by heterogeneous nucleation. These interfaces have not been reported in the literature by thermal spraying process. The measurements of average microhardness on amorphous matrix and boron carbides were 9.1 and 23.85 GPa, respectively. By contrast, the microhardness values of unmelted boron carbide in the amorphous phase were higher than in the substrate, approaching 2.14 GPa. The relative wear resistance of coating was 5.6 times that of substrate. These results indicate that the twin wire arc spraying is a promising technique to prepare amorphous crystalline coatings.