INVESTIGATION OF CHANGES IN THE COMPOSITION, STRUCTURE AND DISPERSION OF CHROMIUM CARBONITRIDE DURING STORAGE AND HEATING IN GAS MEDIA
https://doi.org/10.17073/0368-0797-2014-2-33-40
Abstract
The changes in the composition, structure and dispersion of chromium carbonitride during storage and heating in gas media are investigated. It is found that during annealing in argon and nitrogen at a temperature of 1273 – 1373 K carbonitride becomes carbide Cr3C2 , and during annealing in hydrogen – carbide Cr7C3 . The transformation of carbonitride into carbide Cr3C2 is accompanied by enlargement of the nanopowder that takes place in accordance with the mechanism of solid-state coalescence. Carbonitride interaction with atmospheric gases (oxygen and moisture) occurs in accordance with the adsorption-diffusion mechanism and it is accompanied by a significant increase in oxidation in the first 24 hours. The temperature at the beginning of oxidation in the air depends on the nanoscale and due to the change in particle size from 22 to 53 nm increases from 542 to 568 K. The size dependences for oxidation and the oxidation onset temperature are obtained.
About the Authors
I. V. Nozdrin
Siberian State Industrial University
Russian Federation
Russian Federation
L. S. Shiryaeva
Siberian State Industrial University
Russian Federation
Russian Federation
V. V. Rudneva
Siberian State Industrial University
Russian Federation
Russian Federation
G. V. Galevsky
Siberian State Industrial University
Russian Federation
Russian Federation
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Review
For citations:
Nozdrin I.V., Shiryaeva L.S., Rudneva V.V., Galevsky G.V. INVESTIGATION OF CHANGES IN THE COMPOSITION, STRUCTURE AND DISPERSION OF CHROMIUM CARBONITRIDE DURING STORAGE AND HEATING IN GAS MEDIA. Izvestiya. Ferrous Metallurgy. 2014;57(2):33-40. (In Russ.) https://doi.org/10.17073/0368-0797-2014-2-33-40
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