“…These results demonstrate the superior qualities of CrAlSiN compared to the specially designed tool steel and TiAlSiN hard coatings under similar conditions; indeed, bare steel and TiAlSiN coated-steel oxidise rapidly even below 900°C, the activation of the oxidation process was lower than 800°C. 40-43 4 Graph of the mass gain per unit area (Δm S −1 ) during oxidation in air as a function of temperature a ; time b corresponding to 900, 950, 1000 and 1050°C…”
Section: Resultsmentioning
confidence: 99%
“…These results demonstrate the superior qualities of CrAl-SiN compared to the specially designed tool steel and TiAlSiN hard coatings under similar conditions; indeed, bare steel and TiAlSiN coated-steel oxidise rapidly even below 900°C, the activation of the oxidation process was lower than 800°C. [40][41][42][43] Isothermal oxidation tests were performed at various temperatures in order to study the kinetics of oxidation. In particular, at 800°C no mass gain was recorded, which implies that no additional oxides, apart from the surface self passivation layer detected by XPS, were formed on the tested specimen.…”
The thermal stability and the resistance against oxidation of quaternary compositionally gradient CrAlSiN coatings deposited on steel substrate are investigated by examining their structural, morphological and chemical features before and after oxidation tests, as well as by quantitative thermal analysis. The as-deposited samples exhibit a columnar structure, with each column consisting of nanocrystals as fine as 20 nm. The as-deposited coating is mainly composed of Cr x Al 1−x N solid solution nanocrystals, which are embedded in an amorphous SiN x matrix. When exposed to high-temperature dry air environment the coated samples exhibit remarkable stability as they remained intact up to 800°C. Over 800°C, elements from the substrate outdiffused and modified the chemical content of the film, but still remain oxidation-resistant up to 900°C.
“…These results demonstrate the superior qualities of CrAlSiN compared to the specially designed tool steel and TiAlSiN hard coatings under similar conditions; indeed, bare steel and TiAlSiN coated-steel oxidise rapidly even below 900°C, the activation of the oxidation process was lower than 800°C. 40-43 4 Graph of the mass gain per unit area (Δm S −1 ) during oxidation in air as a function of temperature a ; time b corresponding to 900, 950, 1000 and 1050°C…”
Section: Resultsmentioning
confidence: 99%
“…These results demonstrate the superior qualities of CrAl-SiN compared to the specially designed tool steel and TiAlSiN hard coatings under similar conditions; indeed, bare steel and TiAlSiN coated-steel oxidise rapidly even below 900°C, the activation of the oxidation process was lower than 800°C. [40][41][42][43] Isothermal oxidation tests were performed at various temperatures in order to study the kinetics of oxidation. In particular, at 800°C no mass gain was recorded, which implies that no additional oxides, apart from the surface self passivation layer detected by XPS, were formed on the tested specimen.…”
The thermal stability and the resistance against oxidation of quaternary compositionally gradient CrAlSiN coatings deposited on steel substrate are investigated by examining their structural, morphological and chemical features before and after oxidation tests, as well as by quantitative thermal analysis. The as-deposited samples exhibit a columnar structure, with each column consisting of nanocrystals as fine as 20 nm. The as-deposited coating is mainly composed of Cr x Al 1−x N solid solution nanocrystals, which are embedded in an amorphous SiN x matrix. When exposed to high-temperature dry air environment the coated samples exhibit remarkable stability as they remained intact up to 800°C. Over 800°C, elements from the substrate outdiffused and modified the chemical content of the film, but still remain oxidation-resistant up to 900°C.
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