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  1. 1 Acta Physica Polonica A

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  1. 1 2013

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  1. 1 Ergin N.

  2. 1 Ozdemir O.

  3. 1 Yoruk G.

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Characterization of Ni_3Al and Ti_3Al Coatings Produced by Electric Current Activated Sintering Method

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Ergin N., Yoruk G., Ozdemir O.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 2
245-247
EN
The present study reports on Ni_3Al and Ti_3Al-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 Ni_3Al and Ti_3Al 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 Ni_3Al coating layer were Ni_3Al as a major phase beside NiO and NiAl_2O_4 trace phases, which were confirmed by X-ray diffraction analysis. However, TiAl and Ti trace phases besides major Ti_3Al phase were detected in the Ti_3Al coating. The hardness of the Ni_3Al, Ti_3Al coatings and AISI 1010 substrate was approximately 321 ± 18, 445 ± 13 and 157 HV_{0.5}, respectively.
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