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<p>Parylene C was used to coat the surface of a commercial NiTi alloy. A modified chemical vapor deposition (CVD) process was applied to produce layers with thicknesses ranging from 5&#xa0;μm to 15&#xa0;μm. The adhesion, surface roughness, and wettability of the NiTi/PPX-C composites were characterized. Additionally, their chemical structure and phase composition were analyzed. The martensitic transformation behavior of the NiTi/PPX-C samples was examined in relation to the processing parameters as well as superelastic behavior. The results indicated that parylene C formed a semi-crystalline layer well adhered to the polycrystalline NiTi substrate. A force of nearly 200 N was required to initiate coating delamination. The NiTi/PPX-C composites revealed the reversibility of the martensitic transformation, which occurred entirely below -10&#xa0;°C. The superelastic behavior, with no adverse effects on the adhesion of coatings, was observed after multiple bending cycles.</p>

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Martensitic Transformation and Shape Memory Effect in NiTi/PPX-C Composites Dedicated to Medical Applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月10日

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  • Tomasz Goryczka,
  • Hieronim Szymanowski,
  • Karol Gryń,
  • Barbara Szaraniec

摘要

Parylene C was used to coat the surface of a commercial NiTi alloy. A modified chemical vapor deposition (CVD) process was applied to produce layers with thicknesses ranging from 5 μm to 15 μm. The adhesion, surface roughness, and wettability of the NiTi/PPX-C composites were characterized. Additionally, their chemical structure and phase composition were analyzed. The martensitic transformation behavior of the NiTi/PPX-C samples was examined in relation to the processing parameters as well as superelastic behavior. The results indicated that parylene C formed a semi-crystalline layer well adhered to the polycrystalline NiTi substrate. A force of nearly 200 N was required to initiate coating delamination. The NiTi/PPX-C composites revealed the reversibility of the martensitic transformation, which occurred entirely below -10 °C. The superelastic behavior, with no adverse effects on the adhesion of coatings, was observed after multiple bending cycles.