[PDF]    http://dx.doi.org/10.3952/lithjphys.49215

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 49, 221–227 (2009)


LASER-INDUCED IRON OXIDATION
A. Amulevičius, D. Baltrūnas, A. Daugvila, R. Davidonis, K. Mažeika, V. Remeikis, Č. Sipavičius, and A. Undzėnas
Institute of Physics, Savanoriu 231, LT-02300 Vilnius, Lithuania
E-mail: kestas@ar..lt

Received 10 March 2009; accepted 18 June 2009

Iron oxidation in air flux has been studied and the iron response to laser radiation has been evaluated. Effect of cooling rate on the oxide formation has been demonstrated. The Mössbauer conversion electron spectra have shown that a larger amount of oxides is formed in the surface layer. Any clearly expressed temperature dependence of the oxidation process has not been observed. It has been experimentally determined that the oxide amount depends upon the sample collection site.
Keywords: Mössbauer spectroscopy, laser treatment, iron oxidation
PACS: 42.62.Cf, 82.80.Ej, 81.65.Mq


GELEŽIES OKSIDACIJA VEIKIANT LAZERIO SPINDULIUOTE
A. Amulevičius, D. Baltrūnas, A. Daugvila, R. Davidonis, K. Mažeika, V. Remeikis, Č. Sipavičius, A. Undzėnas
Fizikos institutas, Vilnius, Lietuva

Įvertinta geležies dalelių, atsirandančių lazerinio pjovimo metu, oksidacija oro sraute. Nustatyta, kad priklausomai nuo pjovimo sąlygų ir pjovimo produktų surinkimo vietos oksiduojasi 30–60 % geležies. Įvairių geležies oksidų susidarymui gali būti reikšmingas pradžioje susiformavusio FeO dalinis skilimas į αα-Fe ir Fe3O4 fazes. 23–37 % visos geležies sudarė geležis FeO fazėje. Mesbauerio sugerties ir konversijos elektronų spektrų palyginimas rodo, kad šio oksido gali būti dvigubai daugiau dalelių paviršiuje. Konversijos elektronų spektrai taip pat rodo, kad paviršiuje magnetitas Fe3O4 mažiau stechiometriškas. Geležies oksidų susidarymas lazeriu pjaunant geležies juostą buvo palygintas su geležies oksidacija arba jos pokyčiais veikiant lazerio spinduliu geležies miltelių ir molio bandinius. Įvairių geležies oksidų susidarymo skirtumus esant kitokioms temperatūros sąlygoms – kaitinant krosnyje ar pjaunant impulsiniu lazeriu, išlaikant aukštesnę temperatūrą trumpiau (2 ms), – gali nulemti skirtingos oksidacijos produktų vėsimo sąlygos.


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