Characterizations and Kinetics of Refractory Niobium Carbide Coatings on AISI D3 Steel

Niobium carbide (NbC) coatings were carried out by means of the thermo-reactive diffusion (TRD) on AISI D3 cold work tool steel, in the powder mixture composed of 25 wt.% ferro-niobium, 70 wt.% alumina and 7.5 wt.% ammonium chloride at 1173, 1273 and 1373 K for 2, 4 and 6 h. NbC coatings were inspec...

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Bibliographic Details
Published in:Journal of materials engineering and performance 2023-10, Vol.32 (19), p.8972-8980
Main Authors: Günen, Ali, Açıkgöz, Hasan Hüseyin, Keddam, Mourad, Karahan, İsmail Hakki
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Engineering Design
Materials Science
Quality Control
Reliability
Safety and Risk
Technical Article
Tribology
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Summary:Niobium carbide (NbC) coatings were carried out by means of the thermo-reactive diffusion (TRD) on AISI D3 cold work tool steel, in the powder mixture composed of 25 wt.% ferro-niobium, 70 wt.% alumina and 7.5 wt.% ammonium chloride at 1173, 1273 and 1373 K for 2, 4 and 6 h. NbC coatings were inspected with scanning electron microscopy, x-ray diffractometer, Vickers micro-hardness testing. Homogeneous, crack-free and uniform NbC coatings with 8.75-17.10  µ m thickness and 1586-2263 HV 0.025 hardness were obtained on AISI D3 steel by TRD process. The integral method-based model was used for studying the carbon diffusion by forming NbC coatings. The value of 45.93 kJ mol −1 was determined as the necessary activation energy required for the niobizing process of AISI D3 steel.
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-022-07768-3