Search Results - "Chaia, N."

Oxidation behavior of STA β-21S alloy and variants [Ti-xNb-yMo-5.6Al-0.5Si at%; x + y = 9.5] by Ferreira, L.M., Chaia, N., Coelho, G.C., Nunes, C.A.

“…A correlation between the Nb/Mo contents in the β-21S alloy and the oxidation behavior at high temperatures was investigated. Five alloys were oxidized…”
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Aluminide and silicide diffusion coatings by pack cementation for Nb-Ti-Al alloy by Chaia, N., Cury, P.L., Rodrigues, G., Coelho, G.C., Nunes, C.A.

“…Halide activated pack cementation technique was successfully used to elaborate protective coatings, based on silicon- or aluminum-rich intermetallic compounds,…”
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High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy by Alkmin, L. B., Chaia, N., Utada, S., Cormier, J., Baldan, R., Coelho, G., Nunes, C. A.

“…The present investigations focused on the thermal oxidation of two variants of MAR-M246 alloy having the same contents of Ta and Nb in at. pct, considering the…”
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Creep behavior of conventional and Nb-modified as-cast MAR-M246 superalloy by Alkmin, L.B., Utada, S., Chaia, N., Reis, D.A., Coelho, G.C., Cormier, J., Nunes, C.A.

“…Considering the lower cost of Nb and its chemical similarity to Ta, this work investigated the effect of complete replacement of Ta by Nb (in at.% basis) in…”
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Protective aluminide coating by pack cementation for Beta 21-S titanium alloy by Chaia, N., Cossu, C.M.F.A., Ferreira, L.M., Parrisch, C.J., Cotton, J.D., Coelho, G.C., Nunes, C.A.

“…•TiAl3 coating was deposited on titanium alloy Beta-21S by pack cementation with a cement activated by CrCl3.•Thermodynamic analysis was successfully used to…”
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Liquidus projection of the Al-Cr-V system by Barros, D.F., Santos, J.C.P., Abreu, D.A., Silva, A.A.A.P., Borowski, K.E., Chaia, N., Nunes, C.A., Coelho, G.C.

“…Phase equilibria in the Al-Cr-V system have an important role for designing of low-density Al containing refractory multiprincipal element alloys. In order to…”
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Liquidus projection of the Al–Ti–Zr system by Abreu, D.A., Silva, A.A.A.P., Santos, J.C.P., Barros, D.F., Barros, C.S., Chaia, N., Nunes, C.A., Coelho, G.C.

“…Phase equilibria in Al–Ti–Zr system has an important role for the development of lightweight materials aiming at their application in the aeronautical and…”
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On the interdiffusion in multilayered silicide coatings for the vanadium-based alloy V-4Cr-4Ti by Chaia, N., Portebois, L., Mathieu, S., David, N., Vilasi, M.

“…To provide protection against corrosion at high temperatures, silicide diffusion coatings were developed for the V-4Cr-4Ti alloy, which can be used as the fuel…”
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Multi-layered silicides coating for vanadium alloys for generation IV reactors by Mathieu, S., Chaia, N., Le Flem, M., Vilasi, M.

“…The halide-activated pack-cementation technique was employed to fabricate a diffusion coating that is resistant both to isothermal and to cyclic oxidation in…”
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Experimental determination of liquidus projection in the Cr rich region of the Cr-Si-B system by Chad, V.M., Chaia, N., Villela, T.F., Nunes, C.A., Coelho, G.C.

“…In this work, the Cr-rich region of the Cr-Si-B system have been experimentally investigated on arc-melted alloys in order to build the liquidus projection…”
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Liquidus Projection of the Al-Ta-V System by de Abreu, D. A., Barros, D. F., Santos, J. C. P., Borowski, K. E., Silva, A. A. A. P. da, Chaia, N., Nunes, C. A., Coelho, G. C.

“…Phase equilibria in the Al-Ta-V system have an important role for designing Al-containing refractory multiprincipal element alloys. In order to improve the…”
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The ability of silicide coating to delay the catastrophic oxidation of vanadium under severe conditions by Chaia, N., Mathieu, S., Rouillard, F., Vilasi, M.

“…•Oxidation protection is due to the formation of a pure silica layer.•V–4Cr–4Ti with VxSiy silicide coating withstands 400 1-h cycles (1100°C-Tamb) in…”
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Large enhancement of the CDW resistivity anomaly and traces of superconductivity in imperfect samples of NbTe4 by de Lima, B.S., Chaia, N., Grant, T.W., de Faria, L.R., Canova, J.C., de Oliveira, F.S., Abud, F., Machado, A.J.S.

“…Transition metal chalcogenides usually crystallize in low-dimensional structures that frequently host electronic instabilities such as charge density waves…”
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Growth Kinetics of TiAl3 Diffusion Coating by Pack Cementation on Beta 21-S by Chaia, N., Cossu, C. M., Parrisch, C. J., Cotton, J. D., Coelho, G. C., Nunes, C. A.

“…The growth kinetics of protective diffusion aluminide coatings were investigated on Ti based alloy Beta-21S. The coating was prepared by halide activated pack…”
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An overview of the oxidation performance of silicide diffusion coatings for vanadium-based alloys for generation IV reactors by Chaia, N., Mathieu, S., Cozzika, T., Rouillard, F., Desgranges, C., Courouau, J.L., Petitjean, C., David, N., Vilasi, M.

“…[Display omitted] ► Diffusion barrier to oxygen were manufactured by pack cementation diffusion process. ► The use of CrSi2+Si and TiSi2+Si as masteralloys…”
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Liquidus projection of the Al–Nb–V system by Santos, J.C.P., Chaia, N., Borowski, K.E., da Silva, A.A.A.P., Barros, D.F., Abreu, D.A., Nunes, C.A., Coelho, G.C.

“…In the present work, the liquidus projection of the Al–Nb–V system is proposed for the first time. It corresponds to important data for the design of…”
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Experimental Investigation of Phase Equilibria at 1200 °C in the Al-Nb-V System by Santos, J. C. P., Chaia, N., Borowski, K. E., Silva, A. A. A. P., Barros, D. F., Abreu, D. A., Nunes, C. A., Coelho, G. C.

“…Phase equilibria in the Al-Nb-V system are important data for the design of innovative Al-containing refractory-high-entropy alloys, however issues still open…”
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Experimental isothermal section at 1200 °C of V–Cr–Si system by Chaia, N., David, N., Mathieu, S., Vilasi, M.

“…In the present work, the isothermal section at 1200 °C of the V–Cr–Si phase diagram was experimentally studied. The samples were prepared by arc melting and…”
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Experimental Study of the Binary Nb-Te System by de Lima, B. S., Chaia, N., Correa, L. E., Oliveira, F. S., de Faria, L. R., de Oliveira, I., Coelho, G. C., Machado, A. J. S.

“…Transition metal dichalcogenides have been receiving considerable attention in the literature due to their great variety of physical properties. Recently, some…”
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Experimental study of the liquid–solid phase equilibria of the V–Cr–Si system by Chaia, N., David, N., Coelho, G.C., Nunes, C.A., Mathieu, S., Vilasi, M.

“…[Display omitted] •All primary solidification regions of the liquidus surface of the V–Cr–Si system are determined.•The continuous solution phases (Cr,V)3Si,…”
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