Study of microstructure and tribological properties of NiCrAlY coatings reinforced with Al2O3 particles

Subject Areas :

رئوف رحیم زاده ¹ , علی شفیعی ² , کامران امینی ³

1 - مرکز تحقیقات مواد پیشرفته ، دانشکده مهندسی مواد ،واحد نجف آباد ،دانشگاه آزاد اسلامی، نجف آباد، ایران
2 - مرکز تحقیقات مواد پیشرفته ، دانشکده مهندسی مواد ،واحد نجف آباد ،دانشگاه آزاد اسلامی، نجف آباد، ایران
3 - مرکز تحقیقات مواد پیشرفته ، دانشکده مهندسی مواد ،واحد نجف آباد ،دانشگاه آزاد اسلامی، نجف آباد، ایران

Received: 2016-10-01 Accepted : 2018-06-18 Published : 2018-05-22

Keywords: abrasion, Wear, Thermal spray, Al2O3, NiCrAlY,

Abstract :

This study examines the influence of NiCrAlY powder with and without Al2O3 Reinforcement doses of 5, 10 and 20% by weight, produced by plasma spraying method have been investigated. In order to prepare a composite powder, shaft ball mill blender for an hour for each powder were used. The NiCrAlY powder and powder composite NiCrAlY / Al2O3 with values of 5%, 10%, 20% Al2O3 were coated on Inconel 718 substrates by plasma thermal spraying. In order to evaluate the microstructure, morphological and thermal stability evolutions of the powders and coatings were investigated using X-ray diffraction, scanning electron microscopy with energy dispersive spectroscopy and optical microscopy. Vickers micro and macro hardness test was used to evaluate the hardness..The pin-on -disk test with 5 N was used to cold resistance assessment of coatings. Findings showed that the composite coatings NiCrAlY/Al2O3 because of the size and morphology of different ingredients, has a higher porosity, but in terms of mechanical properties due to reinforced phase, improvements in composite coatings were observed. Evaluate the wear behavior of Al2O3 10% coatings showed that 37.7× 10-6(mm3/Nm)abrasion resistance better than other coatings, especially coatings from powders without reinforcement 114.6× 10-6 (mm3/Nm) abrasion resistance had.

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