A comparative study of high velocity oxygen fuel,vacuum plasma spray,and axial plasma spray for the deposition of CoNiCrAlY bond coat alloy |
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Authors: | A Scrivani U Bardi L Carrafiello A Lavacchi F Niccolai G Rizzi |
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Affiliation: | (1) Department of Industrial Engineering, University of Parma, Parma, Italy;(2) Dipartimento di Chimica, Università di Firenze, Via della Lastruccia n. 3, 50019 Sesto Fiorentino, Firenze, Italy;(3) Turbocoating SpA, Rubbiano di Solignano, Via Volta 3, Parma, Italy |
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Abstract: | In the aerospace field as well as in the stationary gas turbine field, thermally sprayed coatings are used to improve the
surface properties of nickel-super-alloys materials. Coatings are commonly used as bond coat and antioxidation materials (mainly
MCrAlY alloys) and as thermal barrier coatings (mainly yttria partially stabilized zirconia). The purpose of the current study
was to assess the properties of thermally sprayed bond coat CoNiCrAlY alloys comparing the performance of three different
techniques: vacuum plasma spray (VPS), high velocity oxygen fuel (HVOF), and axial plasma spray (AxPS). The quality of the
deposited films has been assessed and compared from the point of view of microstructural (porosity, oxide concentration, unmelted
particles presence) and mechanical (hardness) characteristics. The surface composition and morphology of the coatings were
also determined. Specific efficiency tests were performed for the three examined technologies. The highest quality coatings
are obtained by VPS, but also high velocity oxygen fuel and AxPS sprayed films have interesting properties, which can make
their use interesting for some applications. |
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Keywords: | axial plasma spray CoNiCrAlY high velocity oxygen fuel (HVOF) MCrAlY VPS |
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