Resumen de Wear and high temperature wear on MCrAlY HVOF coatings

Juan V. Miguel, Juan Pereira, J.C. Zambrano, Vicente Amigó B.

• Wear and high temperature wear involve mechanical and chemical mechanisms and the combination of these often result in significant wear and damage on metallic components. Thermal barrier coatings with MCrAlY alloy can improve the tribological and friction wear behaviour. One of the techniques for applying Thermal barrier coatings is thermal sprayed and specially the High velocity Oxi-Fuel (HVOF) is one of the most employed techniques for materials as Nickel or Cobalt base alloys. In this investigation tribological behaviour, on a dry friction and wear behaviour at room temperature and high temperature of new developed NiCoCrAlY and CoNiCrAlY, has been perform in order to know the impact of the technique applied on the coating. Tribological wear tests were performed by sliding wear at 20, 350 and 500 ºC, with an Al2O3 ball as pin on disk configuration tribometer. Wear test for NiCoCrAlY specimens has shown smaller weight losses and lower friction coefficient under high tempe ...