Thermogravimetric investigation on oxidation kinetics of complex Ti-Al alloys

Ostrovskaya, Oxana; Badini, Claudio Francesco; Baudana, Giorgio; Padovano, Elisa; Biamino, Sara

doi:10.1016/j.intermet.2017.09.020

Cited by 29 publications

(39 citation statements)

References 27 publications

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“…However, nonisothermal oxidation studies related to the formation of SiO 2 and MoO 3 during MoSi 2 oxidation is scarce in the literature. Also, several research groups investigated the oxidation stability of a variety of materials through the TGA/DTG/DTA technique using an air atmosphere . So, it is crucial to study the nonisothermal oxidation behavior of MoSi 2 through the TGA/DTG/DTA technique.…”

Section: Resultsmentioning

confidence: 99%

In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂

2018

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Nanocrystalline molybdenum disilicide (MoSi2) is synthesized in a specially designed autoclave at 900°C. The XRD results revealed that the formation of MoSi2 is favorable with the blend of MoO3, Si, and Mg powders. The HR‐TEM and SAED patterns confirm the formation of MoSi2 phase. The structural parameters (crystallite size, strain, stress, and deformation energy density) are calculated using the Williamson‐Hall (W‐H) analysis. The formation mechanism involved in the synthesis of MoSi2 is proposed. The nonisothermal oxidation kinetics (~1200°C) of MoSi2 phase is examined through the thermal analysis techniques. The activation energy is determined by the Kissinger‐Akahira‐Sunsose isoconversional kinetic model. Finally, the reaction mechanism involved during the oxidation of MoSi2 phase is identified using the integral master‐plots method.

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Section: Resultsmentioning

confidence: 99%

In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂

2018

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“…Os elementos do tipo X 1 aumentam a ductilidade da liga e geralmente, refinam o tamanho de grão, como é o caso do vanádio, cromo [7] , molibdênio, cromo+manganês ou cromo+vanádio [1,2] . Uma adição de 1 a 3 (% at.)…”

Section: Influência Dos Elementos Ligaunclassified

“…Entretanto, caso seja empregado em excesso, acima de 10 (% at. ), pode ocasionar alguns problemas na liga como, por exemplo, microssegregação [37] e formação de óxidos mistos de Ti-Nb e Al-Nb [7] .…”

Section: Influência Dos Elementos Ligaunclassified

“…Quando comparadas com as outras ligas, os aluminetos de titânio (TiAl) se revelam promissores para aplicações estruturais em substituição às superligas de Ni [4][5][6][7] , visto que apresentam principalmente, alto ponto de fusão (1400 -1500 °C), manutenção de elevados níveis de resistência mecânica em condições de temperaturas entre 600 e 950°C , e além disso, seu maior diferencial consiste na baixa densidade (3,8 -4,0 mg / cm 2 ), que resulta em uma redução de até 50% em massa dos componentes fabricados a partir desta liga [1,2,[8][9][10][11] .…”

Section: Introductionunclassified

“…As composições que tiveram maior interesse e aplicação industrial correspondem às ligas Ti-48Al-2Cr-2Nb (4822) e Ti-43,5Al-4Nb-1Mo-0,1B (TNM), pertencentes a segunda e terceira geração, respectivamente. A primeira encontra-se em operação desde 2011 na General Eletric ™ na fabricação de lâminas fundidas em baixa pressão e temperatura [5,7,19] , e a segunda, entrou serviço em 2016 através do Pratt & Whitney PurePower ™ na fabricação de lâminas de turbinas em baixa pressão e temperatura por processo de forjamento [5,23] .…”

Section: Introductionunclassified

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Caracterização microestrutural e comportamento à oxidação em temperaturas elevadas de ligas TiAl

Oliveira¹

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Oxidation Behavior and Interfacial Bonding Properties of NiCrAl Alloys

Song

et al. 2022

ChemistrySelect

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The oxidation behavior and oxidation kinetics of NiCrAl alloy were studied by XRD, SEM and the thermogravimetric analysis method. The adhesion strength of the films was characterized by micron scratch tester. The results show that the oxide film has not formed at 600 °C and 700 °C, and an oxide layer of Al2O3 has formed at 800 °C. Moreover, an oxide layer composed of Cr2O3 and Al2O3 has formed at 900 °C. After oxidation at 800 °C for 100 h, partial θ‐Al2O3 has transformed to steady‐state α‐Al2O3 and a dense oxide film of Al2O3 with the thickness of about 620 nm has formed on the surface of the NiCrAl alloy. The oxidation kinetics curve of the alloy obeys the parabolic law and there are two oxidation rate constants in the oxidation process. The oxidation rate constant of 1.58×10−4 mg2⋅cm−4⋅h−1 in the early oxidation period (0∼12 h) and the oxidation rate constant of 1.04×10−4 mg2⋅cm−4⋅h−1 in the late oxidation period (12∼100 h) indicate that the oxidation resistance ability of the alloy increases with the extension of oxidation time. With the increase of the oxidation time, the interface bonding strength between the oxide film and the substrate can be improved and reaches 5.21 N at 800 °C for 100 h.

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Thermogravimetric investigation on oxidation kinetics of complex Ti-Al alloys

Cited by 29 publications

References 27 publications

In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂

In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂

Caracterização microestrutural e comportamento à oxidação em temperaturas elevadas de ligas TiAl

Oxidation Behavior and Interfacial Bonding Properties of NiCrAl Alloys

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Thermogravimetric investigation on oxidation kinetics of complex Ti-Al alloys

Cited by 29 publications

References 27 publications

In situ single‐step reduction and silicidation of MoO3 to form MoSi2

In situ single‐step reduction and silicidation of MoO3 to form MoSi2

Caracterização microestrutural e comportamento à oxidação em temperaturas elevadas de ligas TiAl

Oxidation Behavior and Interfacial Bonding Properties of NiCrAl Alloys

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Product

Resources

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In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂

In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂