The influence of iron nanocrystallite size on a nitriding process rate

• Autorzy: Pelka R. , Glinka P. , Arabczyk W.
• Języki publikacji: EN

Abstrakty

EN

In the course of nitriding process of nanocrystalline iron promoted with aluminum and calcium oxides, nitrides such as Fe4N and Fe3-2N were fabricated. The process rate was studied making use of a flow differential tubular reactor with thermogravimetric measurement of mass changes. Nanocrystalline iron was reduced under hydrogen atmosphere at 500 oC and 800 oC. Average crystallite sizes determined by the XRD method after reduction performed at 500 oC as well as at 800 oC and after passivation were 18 and 42 nm, respectively. The nitriding process rate as well as catalytic ammonia decomposition rate were limited by the ammonia dissociative adsorption rate on the surface of iron and were dependent on the ratio of the crystallite surface area to crystallite volume. Obtained results were explained based on the adsorption range model.

Słowa kluczowe

EN

nanocrystalline iron; nitriding process; ammonia decomposition; thermogravimetry; XRD

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2008
• Tom: Vol. 26, No. 2
• Strony: 349--356
• Opis fizyczny: Bibliogr. 6 poz.

Twórcy

autor

Pelka R.

autor

Glinka P.

autor

Arabczyk W.

• Institute of Chemical and Environment Engineering, Szczecin University of Technology, ul. Pułaskiego 10, 70-322 Szczecin

Bibliografia

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• [6] ZAMŁYNNY J., Examination of kinetics of nitriding of ferrous catalyst (in Polish) PhD Thesis,