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2013 | 123 | 2 | 271-273
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The Properties of Cr-Al-N Based Coatings Formed on AISI D2 Steel by Thermo-Reactive Diffusion Technique

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In this study, chromium aluminum nitride coating was applied on pre-nitrided AISI D2 steel by the thermo-reactive deposition technique in a powder mixture consisting of ferrochromium, aluminum, ammonium chloride, and alumina at 1000C for 2 h. Steels were gas nitrided for the purpose to enrich the surfaces with nitrogen of the steels in a nitrogen and ammonia atmosphere at 560C for 8 h. The effect of aluminum content in the powder mixture on the Cr-Al-N layer properties was investigated. The coated samples were characterized by X-ray diffraction analysis, scanning electron microscope, and micro-hardness tests. Chromium aluminum nitride layer formed on the pre-nitrided AISI D2 steel was compact and homogeneous. Electron dispersive spectrometer results showed that coating layer includes chromium, aluminum, and nitrogen. X-ray studies showed that the phases formed in the coating layers on the steel surfaces are Cr_2N, (Cr,Fe)_2N_{1-x}, AlN, and Fe_2N. The depth of the Cr-Al-N layer ranged from 10.01 ± 1.2 to 13.2 ± 1.7 μm, depending on the aluminum content. The hardness of the coated layers produced on AISI D2 steel are changing from 1743 ± 150 HV_{0.01} to 2067 ± 160 HV_{0.01} depending on bath compositions.
  • Department of Metallurgical and Materials Engineering, Institute of Arts and Sciences, Sakarya University, Sakarya, Turkey
  • Department of Metallurgical and Materials Engineering, Engineering Faculty, Sakarya University, Esentepe Sakarya, Turkey
  • Department of Metallurgical and Materials Engineering, Engineering Faculty, Sakarya University, Esentepe Sakarya, Turkey
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