Preparation and first principle calculation of Al/Cu coating on stainless steel surface
LI Deyuan
LI Guangquan
ZHANG Nannan
Abstract：To study the formation sequence and mechanism of intermetallic compounds in Al/Cu coatings,Al/Cu coating was prepared on 304 stainless steel substrate.Subsequently,the samples were heat treated to obtain intermetallic compounds by in-situ reaction within Al/Cu coating.In addition,the oxidation resistance of the coating at high temperatures was tested.First principles were used to calculate the enthalpy,entropy,Gibbs free energy and heat capacity of Al-Cu intermetallic compounds.Through the combination of thermodynamics with diffusion dynamics,an effective free energy of formation model was proposed to predict the formation sequence of compounds at the Al/Cu interface.The results show that the Al2 Cu phase is formed first within the Al/Cu coating,the AlCu phase appears at the Al/Cu interface,and the Cu-rich Al4 Cu9 phase appears as the heating time increases to 20 h.The formation sequence of Al-Cu intermetallic compounds is Al2 Cu→AlCu→Al4 Cu9,which is obtained by first principle calculation and is consistent with the experimental results.The oxidation experimental results show that the coating has excellent oxidation resistance at high temperatures.
Keywords：Al/Cu coating304 stainless steelarc sprayingplasma sprayingfirst principle calculationintermetallic compoundhigh temperature oxidation resistanceheat treatment
Publication Date：2024-03-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 165-171 )