Wear performance of GGG60 ductile iron rollers coated with WC-Co by electro spark deposition

Mustafa Buğday; Mehmet Karalı; Şükrü Talaş

doi:10.3989/revmetalm.249

Autores/as

Mustafa Buğday Department of Mechanical Engineering, Karabuk University https://orcid.org/0000-0003-4413-509X
Mehmet Karalı Department of Mechatronics Engineering, Necmettin Erbakan University https://orcid.org/0000-0002-2380-0575
Şükrü Talaş Department of Metallurgical and Materials Engineering, Afyon Kocatepe University https://orcid.org/0000-0002-4721-0844

DOI:

https://doi.org/10.3989/revmetalm.249

Palabras clave:

Carburo de tungsteno, Cobalto, Desgaste, Electrodeposición por chispa, Laminado, Recubrimiento

Resumen

Las fundiciones nodulares se utilizan en muchas aplicaciones industriales, como bastidores y carrocerías de máquinas, rodillos y bloques de motor, debido a su mayor resistencia y ductilidad con una buena maquinabilidad comparable a la de las fundiciones grises. En este estudio, la superficie exterior de las fundiciones nodulares (GGG-60) se recubrió con WC/Co mediante electrodeposición por chispa (ESD). El objetivo del estudio es mejorar tanto la calidad superficial como el comportamiento frente al desgaste con los recubrimientos formados sobre la superficie de los rodillos deformados plásticamente, cuya resistencia al desgaste disminuye con el tiempo debido a las condiciones de trabajo de alto esfuerzo. Se aplicó un tratamiento térmico a 950 ºC durante 2 h a los rodillos de GGG60 y la mitad de los rodillos se dejaron sin recubrir y la otra mitad se recubrió con electrodos de WC-Co. El comportamiento al desgaste de las superficies tratadas térmicamente y recubiertas se midió mediante el método de desgaste bola sobre disco utilizando bolas de Al₂O₃ con un diámetro de 6 mm para una distancia de deslizamiento de 250 m a una velocidad de deslizamiento de 6,5 m·s^-1 en condiciones secas y utilizando una carga de 40 N. Los recubrimientos de WC/Co se aplicaron con éxito a los rodillos. En las imágenes SEM/EDS se detectó la presencia de elementos de W, Fe, C, Co y Al en la parte recubierta de los rodillos y de elementos de Fe, C y Al en la región no recubierta. Se concluyó que el recubrimiento y el tratamiento térmico aumentaron la resistencia al desgaste en casi 5 veces y disminuyeron el coeficiente de fricción en 2,13 veces.

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Citas

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