Tribological Behavior of Ni-Based WC-Co Coatings Deposited via Spray and Fuse Technique Varying the Oxygen Flow

Author:

Jiménez H.12ORCID,Olaya J. J.1ORCID,Alfonso J. E.3ORCID

Affiliation:

1. Department of Mechanical Engineering and Mechatronics, Universidad Nacional De Colombia, Street 45, 26-85, Bogotá, Colombia

2. Research Group in Energy and Materials (REM), Faculty of Mechanical Engineering, Universidad Antonio Narino, Bogota, Colombia

3. Ciencia De Materiales y Superficies, Physis Department, Universidad Nacional De Colombia, Street 45, 26-85, Bogotá, Colombia

Abstract

The tribological behavior of Ni-based WC-Co coatings is analyzed. The coatings were deposited on gray cast iron substrates in a spray and fuse process using SuperJet Eutalloy deposition equipment, varying the oxygen flow conditions in the flame. The crystallographic structure of the coatings was characterized via the X-ray diffraction (XRD) technique. The microhardness was measured on the surface and in cross sections of the coatings by means of a Knoop microhardness tester. The topography and the morphological characteristics of the coatings and the tribo-surfaces were examined using scanning electron microscopy (SEM) and confocal microscopy, while the chemical composition was measured by means of energy-dispersive X-ray spectroscopy (EDS). The tribological behavior of the coatings was examined via a cohesion-adhesion scratch test, using cross sections of the coatings. Furthermore, two wear tests were carried out, using the pin-on-disk method under ASTM G99 standard and an ASTM standard G65 sand/rubber wheel abrasion wear test. The wear of the coatings showed a close relationship to the porosity in the metal matrix; since then, in the abrasive wear test, a high porosity is related with lower hardness in the coatings; likewise, a low hardness is related with a high wear.

Funder

Departamento Administrativo de Ciencia, Tecnología e Innovación

Publisher

Hindawi Limited

Subject

Surfaces, Coatings and Films,Mechanical Engineering

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