Abstract
Coating growth and mechanical properties of nanolamellar Cr2AlC coatings at various sputtering power were investigated in the present study. Cr2AlC coating was deposited on the IN 718 superalloy and (100) Si wafers by DC magnetron sputtering at different sputtering powers. The structure and properties were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nanoindentation. It was found that coatings had columnar structure with nanocrystalline substructure. Deposition rate increased with the sputtering power. XRD results showed the presence of the Cr2AlC MAX phase, intermetallic AlCr2 and Cr7C3 carbide phases, along with the change in preferential coating growth orientation. TEM observations confirmed the occurrence of these phases, and the SAED patterns demonstrated significant texture of the coatings. Hardness values were measured in the range between 11–14 GPa, showing a slight increase with the sputtering power.
Highlights
MAX phase is a group of compounds, which provides a unique combination of metallic and ceramic properties due to the presence of M-A metallic and M-X ceramic bonds
Deposition increase of almost 100% can be seen with the sputtering power the sputtering power
The Cr2 AlC films observed by transmission electron microscopy (TEM) showed nanocrystalline substructure with a column thickness in the 100–200 nm range along with high texture of the coatings
Summary
MAX phase is a group of compounds, which provides a unique combination of metallic and ceramic properties due to the presence of M-A metallic and M-X ceramic bonds They are nanolamellas with Mn+1 AXn (n is 1, 2, or 3) chemical formula, where M is an early transition metal, A is an A-group element from the periodic table and X is either carbon or nitrogen [1]. Palmquist et al [23]
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