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<p>NiTi thin coatings are increasingly explored to enhance the performance of bearing steel (AISI 52100) components in engineering applications due to their superior mechanical and tribological properties. In this research, NiTi thin coatings were deposited on bearing steel substrates using radio frequency magnetron sputtering. The deposition process was conducted with power densities of 1.72&#xa0;W/cm<sup>2</sup> for Ni and 2.96&#xa0;W/cm<sup>2</sup> for Ti, at a working pressure of 0.4&#xa0;Pa. The microstructure, mechanical, and tribological properties of the coating were characterized using a range of techniques, including GI-XRD, FESEM, EDS, nanoindentation, scratch testing, 3D surface analysis, and ball-on-disk tribological testing. The composite interlayer developed columnar dendrites extending toward the NiTi coating layer, with a gradient distribution of Ni and Ti elements observed in the elemental spectra. The NiTi coating demonstrated a hardness of 7.57&#xa0;GPa, marking a 33.9% improvement compared to the AISI 52100 substrate. The tribological performance of the coating was evaluated against a Si<sub>3</sub>N<sub>4</sub> ball using a reciprocating ball-on-disk tribometer under varying loads. The NiTi-coated specimens exhibited superior wear resistance compared to the uncoated AISI 52100 substrate under identical conditions. The NiTi coating achieved the lowest coefficient of friction (0.036) at a 1.5&#xa0;N sliding load and the minimum wear rate (3.39 × 10<sup>−6</sup>&#xa0;mm<sup>3</sup>/N&#xa0;m) at a 1.25&#xa0;N sliding load.</p>

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Influence of Radio Frequency Magnetron Sputtering on the Microstructure, Mechanical Properties, and Wear Performance of NiTi Alloy Coating on Bearing Steel

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Tajamul Ashraf,
  • Pavan Kumar Vangara,
  • Turali Narayana,
  • Deepak Kumar Naik,
  • Shahid Saleem,
  • Koppala Venu Gopal

摘要

NiTi thin coatings are increasingly explored to enhance the performance of bearing steel (AISI 52100) components in engineering applications due to their superior mechanical and tribological properties. In this research, NiTi thin coatings were deposited on bearing steel substrates using radio frequency magnetron sputtering. The deposition process was conducted with power densities of 1.72 W/cm2 for Ni and 2.96 W/cm2 for Ti, at a working pressure of 0.4 Pa. The microstructure, mechanical, and tribological properties of the coating were characterized using a range of techniques, including GI-XRD, FESEM, EDS, nanoindentation, scratch testing, 3D surface analysis, and ball-on-disk tribological testing. The composite interlayer developed columnar dendrites extending toward the NiTi coating layer, with a gradient distribution of Ni and Ti elements observed in the elemental spectra. The NiTi coating demonstrated a hardness of 7.57 GPa, marking a 33.9% improvement compared to the AISI 52100 substrate. The tribological performance of the coating was evaluated against a Si3N4 ball using a reciprocating ball-on-disk tribometer under varying loads. The NiTi-coated specimens exhibited superior wear resistance compared to the uncoated AISI 52100 substrate under identical conditions. The NiTi coating achieved the lowest coefficient of friction (0.036) at a 1.5 N sliding load and the minimum wear rate (3.39 × 10−6 mm3/N m) at a 1.25 N sliding load.