Abstract
In this study, the CoCrAlYTa-10%Al2O3 coatings were prepared by the high-velocity oxygen-fuel (HVOF) spraying. A series of ball-on-disk sliding wear tests were conducted to evaluate the tribological properties of the coatings at different temperatures (25 °C, 200 °C, 400 °C, and 600 °C). The results showed that the average coefficients of friction (COFs) of the CoCrAlYTa-10%Al2O3 coatings were lower than that of H13 steel at different temperatures. The average COFs of the CoCrAlYTa-10%Al2O3 coatings and H13 steel both decreased with increasing temperature. The wear rate of the CoCrAlYTa-10%Al2O3 coatings increased first and then decreased. The microhardness of worn surface of the CoCrAlYTa-10%Al2O3 coatings increased with increasing temperature, while the microhardness of worn surface of H13 steel at 25 °C and 200°C was higher than that at 400 °C and 600 °C. The wear mechanism of the two materials was mainly abrasive wear. The tribofilms were formed on the worn surface of the CoCrAlYTa-10%Al2O3 coatings, which had a good protective effect. Due to thermal softening and low binding strength of debris, it was difficult for H13 steel to form the tribofilms. The wear rate of H13 steel was much higher than that of the CoCrAlYTa-10%Al2O3 coatings at 400 °C and 600 °C, indicating that the high temperature wear resistance of the coatings was much better than that of H13 steel.
Highlights
Improving the life of the hot extrusion dies and wear-resistant mechanical parts has crucial significance in the industrial application [1,2,3,4,5,6,7]
In order to study the effect of temperatures on the wear properties and mechanisms of the coatings and H13 steel, the microstructure and phase composition were determined with X-ray diffraction (XRD, Bruker D8-Advanced, Bruker Inc., Karlsruhe, Germany) and scanning electron microscope (SEM)
The CoCrAlYTa-10%Al2 O3 coatings were prepared by high-velocity oxygen-fuel (HVOF) spraying
Summary
Improving the life of the hot extrusion dies and wear-resistant mechanical parts has crucial significance in the industrial application [1,2,3,4,5,6,7]. Preparing high-performance coatings on the hot extrusion dies and wear-resistant mechanical parts can improve the mechanical performance and wear resistance of worn surface. At the same time, adding hard phases (TaC, Al2 O3 , and TiC) is an important way to improve the high temperature mechanical properties of the coatings [6,20,21,22,23,24,25]. The data obtained can be used as a reference for the selection of high temperature wear coatings on hot-working dies and wear-resistant mechanical parts
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