Ni-Al-Ti coatings obtained by microwave assisted SHS: Oxidation behaviour in the 750-900 °C range

Boromei, I.; Casagrande, A.; Tarterini, F.; Poli, Giorgio; Veronesi, Paolo; Rosa, Roberto

doi:10.1016/j.surfcoat.2009.11.018

Microwaves have been used to ignite the Self-propagating High-temperature Synthesis (SHS) of Ni and Al powder mixtures to produce a duplex intermetallic coating on Ti substrates. Due to the high exothermic nature of the reaction, the newly formed NiAl is in the liquid phase and can react with the underlying Ti to form a tough ternary intermediate layer, belonging to the Ti-Ni-Al system, in a one step process. Aim of this work is to assess the high-temperature performances of the Ti-Ni-Al layer, compared to NiAl coating and Ti. Experimental results demonstrate that the ternary layer presents oxidation resistance comparable to NiAl up to 750 °C. In this condition, the thick Ti-Ni-Al layer could replace the functionality of hard and brittle NiAl coatings. At 900 °C, instead, NiAl oxidation resistance results higher, and this can be ascribed to the relatively low Al content in the studied ternary compound, which hinders the formation of a continuous and protective scale

Ni-Al-Ti coatings obtained by microwave assisted SHS: Oxidation behaviour in the 750-900 °C range / Boromei, I.; Casagrande, A.; Tarterini, F.; Poli, Giorgio; Veronesi, Paolo; Rosa, Roberto. - In: SURFACE & COATINGS TECHNOLOGY. - ISSN 0257-8972. - STAMPA. - 204(2010), pp. 1793-1799.

Data di pubblicazione:	2010
Titolo:	Ni-Al-Ti coatings obtained by microwave assisted SHS: Oxidation behaviour in the 750-900 °C range
Autore/i:	Boromei, I.; Casagrande, A.; Tarterini, F.; Poli, Giorgio; Veronesi, Paolo; Rosa, Roberto
Autore/i UNIMORE:	Boromei I. Casagrande A. Tarterini F. POLI, Giorgio VERONESI, Paolo ROSA, Roberto mostra contributor esterni nascondi contributor esterni
Digital Object Identifier (DOI):	http://dx.doi.org/10.1016/j.surfcoat.2009.11.018
Rivista:	SURFACE & COATINGS TECHNOLOGY
Volume:	204
Pagina iniziale:	1793
Pagina finale:	1799
Codice identificativo ISI:	WOS:000275391200017
Codice identificativo Scopus:	2-s2.0-74849104866
Citazione:	Ni-Al-Ti coatings obtained by microwave assisted SHS: Oxidation behaviour in the 750-900 °C range / Boromei, I.; Casagrande, A.; Tarterini, F.; Poli, Giorgio; Veronesi, Paolo; Rosa, Roberto. - In: SURFACE & COATINGS TECHNOLOGY. - ISSN 0257-8972. - STAMPA. - 204(2010), pp. 1793-1799.
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