Effect of surface macroroughness on the microstructure and sliding wear properties of Al2O3 + 13 wt.% TiO2 thick coatings

Sara I.  Zesati-Belmontes; Enrique A.  López-Baltazar; José J.  Ruiz-Mondragón; Haideé  Ruiz-Luna; Francisco  Alvarado-Hernández; Víctor H.  Baltazar-Hernández

doi:10.3989/revmetalm.232

Authors

Sara I. Zesati-Belmontes CIATEQ, Manufactura Avanzada Sede Aguascalientes - Materials Science and Engineering Program, Universidad Autónoma de Zacatecas https://orcid.org/0000-0002-6226-2108
Enrique A. López-Baltazar Materials Science and Engineering Program, Universidad Autónoma de Zacatecas https://orcid.org/0000-0001-9792-7141
José J. Ruiz-Mondragón Corporación Mexicana de Investigación en Materiales SA de CV https://orcid.org/0000-0003-1925-8610
Haideé Ruiz-Luna Materials Science and Engineering Program, Universidad Autónoma de Zacatecas - CONACYT - Universidad Autónoma de Zacatecas https://orcid.org/0000-0002-2799-8486
Francisco Alvarado-Hernández Materials Science and Engineering Program, Universidad Autónoma de Zacatecas https://orcid.org/0000-0002-8344-6379
Víctor H. Baltazar-Hernández Materials Science and Engineering Program, Universidad Autónoma de Zacatecas https://orcid.org/0000-0001-8629-9936

DOI:

https://doi.org/10.3989/revmetalm.232

Keywords:

Al2O3 13 wt.-% TiO2 coatings, Macroroughness, Sliding wear, Thermal spraying, Thick coating

Abstract

ABSTRACT

Two macro-roughness patterns namely spiral grooving and diamond knurling were performed on an AISI/SAE 1045 cylindrical steel bar. Al₂O₃ + 13 wt.-% TiO₂ powder was deposited by utilizing a multi-pass torch. Microstructure, microhardness and wear resistance were analyzed. The presence of both γ-Al₂O₃ and α-Al₂O₃ throughout the coating was promoted by partially melted and un-melted particles; however, the formation of interlayers of hard α-Al₂O₃ was influenced by the re-heating during the multi-pass torch causing transformation from γ-Al₂O₃→α-Al₂O₃. Knurling pattern specimens contained less defects owe to a suitable splat accommodation thus strengthening the inter-splat anchorage. The improved sliding wear resistance was influenced by both the combination of γ-Al₂O₃ (toughness) and α-Al₂O₃ (hardness) phases and, predominantly by the reduced porosity and micro-cracks in specimens with the knurling pattern.

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