The Response of Nitriding Chemistry to Different Initial Gas Compositions

Bedii Özdemir*, Firat Akar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The response of the kinetics of surface-catalyzed reactions to different initial conditions in a gas nitriding furnace has been studied. The predictions are made under the conditions with both high and low concentrations of ammonia and a process temperature of around 520 °C. Results are presented in temporal variations of gas temperature and concentrations and coverages of surface species. It has been shown that in the composition where NH3 content is richer, there is a strong possibility of developing substantially higher Nad coverage and so diffusion into the material. Reducing the ammonia content, which means an increase in the proportion of N2 in the initial mixture, leads to a quicker saturation of the furnace atmosphere to the desorption of the reaction product, N2, which eventually suppresses the advance of reaction in the forward direction. Low coverage values of Had have proved that the adsorbed hydrogen is the most unstable species on the surface.

Original languageEnglish
Pages (from-to)3002-3007
Number of pages6
JournalJournal of Materials Engineering and Performance
Issue number8
Publication statusPublished - 1 Aug 2015

Bibliographical note

Publisher Copyright:
© 2015, ASM International.


The authors thank Dr. Nils Lippmann for stimulating discussions. This work was supported partially by the Department of Process Development (TEF11) at Robert Bosch Turkey (RBTR) under the contract number RBTR-1993.

FundersFunder number
Department of Process DevelopmentTEF11
Robert Bosch TurkeyRBTR-1993


    • chemical analysis
    • coatings
    • heat treatment
    • modeling and simulation
    • nitriding process
    • surface reactions


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