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Surface oxidation of Ni20Cr/Cr3O2 composite processed by ball milling and HVOF thermal spraying
ISRAEL LOPEZ BAEZ
ENRIQUE MARTINEZ FRANCO
CARLOS AGUSTIN POBLANO SALAS
LUIS GERARDO TRAPAGA MARTINEZ
En Embargo
12-07-2018
Atribución-NoComercial-CompartirIgual
10.1016/j.vacuum.2017.07.011
0042-207X
https://www.sciencedirect.com/science/article/pii/S0042207X17303603
Composite powder
Oxide dispersion
Ball milling
Oxide layer
HVOF coating
A Ni20Cr/Cr2O3 composite powder was successfully processed by controlling different mechanical milling conditions. The powder was heat treated at various temperatures to evaluate the effects of fine Cr2O3 particles additions on the microstructure of the Ni20Cr matrix. Thermogravimetric analysis indicated an earlier oxidation temperature of the composite powder (250e270 C) compared to the oxidation temperature of the Ni20Cr matrix (680e700 C), the fine Cr2O3 particles may act as nucleation sites to promote matrix oxidation at lower temperatures. Ni20Cr/Cr2O3, commercial, and experimental Ni20Cr powders were used as feedstock to produce coatings by HVOF thermal spraying. Raman studies showed NiCr2O4 and Cr2O3 as main phases in the microstructure of Ni20Cr/Cr2O3 composite coating. A residual Ni20Cr phase, processed by ball milling, was preserved in the coatings microstructure; such a phase improved oxygen and chromium diffusion, then allowing the formation of a thick oxide protective layer in the coatings during oxidation tests. Oxide scales produced during sliding wear test were strongly anchored to the Ni20Cr/Cr2O3 coating surface, a wear rate of 20.2 10 6 mm3/N$m was measured when such a coating was tested employing a pin-on-disc configuration.
Elsevier B. V.
2017
Artículo
Vacuum Volume 144, October 2017, Pages 27-35
Inglés
Público en general
López-Báez, Israel, Enrique Martínez-Franco, Carlos Agustín Poblano-Salas, and Luís Gerardo Trápaga-Martínez. 2017. “Surface Oxidation of Ni20Cr/Cr3O2 Composite Processed by Ball Milling and HVOF Thermal Spraying.” Vacuum 144: 27–35. http://www.sciencedirect.com/science/article/pii/S0042207X17303603 (February 7, 2018).
PULVIMETALURGIA
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