Modification of NiAl Intermetallic Coatings Processed by PTA with Chromium Carbides
作者： D. H. S. Yano , C. Brunetti , G. Pintaude , A. S. C. M. D’Oliveira , L. Canale
DOI: 10.1520/JAI103439
关键词:
摘要: Equipment that operates under high-temperatures can be protected with NiAl intermetallic coatings because of their metallurgical stability. This study evaluates the effect chromium carbides added to Ni–Al processed by plasma transferred arc (PTA). Mixtures Ni and Al powders without different Cr23C6 fractions (15, 30, 45 wt %) were deposited PTA on an AISI 304 stainless steel plate, using two currents (100 150 A). Coatings evaluated for presence welding defects, developed microstructures characterized X-ray diffraction scanning electron microscopy. Vickers microhardness semiquantitative energy dispersive spectroscopy chemical composition also determined. Cr7C3 development was confirmed analysis. A combination NiAl/Cr–Fe–Ni phases identified. The hardness strongly related formed volume fractions. present shows hardfacing used produce reinforced high-temperature applications, showing significant advances toward withstand severe operation conditions.
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