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Particularities of carburising kinetics in different media

D. DRAGOMIR1,* , M. O. COJOCARU2, L. N. DRUGA3

Affiliation

  1. UTTIS, Vidra, Ilfov, 077185, Romania
  2. Polytehnica” University, Faculty of Materials Science and Engineering, 060032, Bucuresti, Romania
  3. Romanian Academy for Technical Sciences, Bucuresti, Romania

Abstract

The kinetics of the carburising processes in media which are relatively rare used in the thermochemical treatments practice (paste, paste-urban fuel gas, urban fuel gas) for specific applications or in case of inappropriate endowment of thermochemical treatments facilities is less addressed in the technical literature in the field. In this sense, this paper attempts to bring further knowledge in the field of carburising processes kinetics in these types of carburising media, in particular, and of the ways of accelerating of the carburising layers growth kinetics, in general. The experimental researches performed on basis of a non compositional programme aimed to study the kinetics differences developed during carburising of a low alloyed case hardening steel in various media: paste, paste-urban fuel gas in comparison with carburising in urban fuel gas in the presence of the fluidization state of the media with a view of highlighting of the process parameters (carburising temperature and holding time at the carburising temperature) influences, respectively the assessment of the fluidization state on the carburising kinetics changes. The results of the carburising experiments performed at temperatures in the range of 900 ... 1000° C and times in the range of 30 ... 90 min confirm that the paste provides a carburising kinetics superior to that assured by urban fuel gas and the carburising kinetics in combined media (paste-urban fuel gas) has an intermediate value. The paper presents also the possibility to accelerate the kinetics of carburising process in urban fuel gas by using of the fluidized bed, the carburising kinetics recorded in this case being the most intense for the treatment temperatures and times investigated..

Keywords

Carburising kinetics, Paste, Urban fuel gas, Fluidization state.

Submitted at: March 25, 2013
Accepted at: July 11, 2013

Citation

D. DRAGOMIR, M. O. COJOCARU, L. N. DRUGA, Particularities of carburising kinetics in different media, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 7-8, pp. 683-688 (2013)