Characterization of Ni3Al and Ti3Al Coatings Produced by Electric Current Activated Sintering Method |
| N. Ergin, G. Yoruk and O. Ozdemir
Technology Faculty, Department of Metallurgy and Materials Engineering, Sakarya University, Esentepe Campus, 54187 Sakarya, Turkey |
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| The present study reports on Ni3Al and Ti3Al-based intermetallics coated on AISI 1010 steel substrate by one-step pressure assisted electric current activated sintering method. Ni, Ti, and Al elemental powders were mixed in the stoichiometric ratio corresponding to the Ni3Al and Ti3Al intermetallics at molar proportion of 3:1. The mixed coating powders were placed onto the steel substrate in a mold, and pressed with compressive stress of 100 MPa and then, electric current: 1100-1200 A, voltage 2.9-3.4 V was applied for 15 min during coating. As-synthesized coatings seem to have good adherence with many small porosities. The phases formed in the Ni3Al coating layer were Ni3Al as a major phase beside NiO and NiAl2O4 trace phases, which were confirmed by X-ray diffraction analysis. However, TiAl and Ti trace phases besides major Ti3Al phase were detected in the Ti3Al coating. The hardness of the Ni3Al, Ti3Al coatings and AISI 1010 substrate was approximately 321 ± 18, 445 ± 13 and 157 HV0.5, respectively. |
DOI: 10.12693/APhysPolA.123.245 PACS numbers: 81.20.Ev, 81.40.Pq |