INVESTIGATION OF THE CHANGE OF CHEMICAL COMPOSITION OF CHROMIUM BORIDE BY THE REFINING, STORAGE AND HEATING IN THE AIR
https://doi.org/10.17073/0368-0797-2013-10-3-10
Abstract
The investigation of the change of chemical composition of the nanopowder of chromium boride CrB2 by the refining, storage and heating in the air is investigated. The conditions of effective refining of chromium boride from free boron, carbon and chromium, including consistently held alkaline (NaOH) and acid (HCl) treatment are identified. The interaction of chromium boride with atmospheric gases (oxygen and moisture), taking place on the adsorption-diffusion mechanism and accompanied by a significant increase in oxidation in the first 24 hours is studied. It is established that with increasing of the particle size from 26 to 75 nm, the value of oxidation is changed from 17,01·10–7 to 10,82·10–7 kg of oxygen ∙ m–2 of surface of the powder. The analytical dimensional dependence is received for oxidation. The temperature of the beginning of oxidation in the air depends on the level of dispersion and it is 763 К for the nanopowder and 793 K for micropowder.
About the Authors
I. V. Nozdrin
Сибирский государственный индустриальный университет
Russian Federation
Russian Federation
V. V. Rudneva
Сибирский государственный индустриальный университет
Russian Federation
Russian Federation
G. V. Galevsky
Сибирский государственный индустриальный университет
Russian Federation
Russian Federation
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Review
For citations:
Nozdrin I.V., Rudneva V.V., Galevsky G.V. INVESTIGATION OF THE CHANGE OF CHEMICAL COMPOSITION OF CHROMIUM BORIDE BY THE REFINING, STORAGE AND HEATING IN THE AIR. Izvestiya. Ferrous Metallurgy. 2013;56(10):3-10. (In Russ.) https://doi.org/10.17073/0368-0797-2013-10-3-10
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