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目的:研究镍钛合金表面耐磨镀层的制备工艺和性能,提高镍钛根管器械的表面硬度和耐磨性。方法:采用直流电镀法在NiTi合金表面制备了Ni-W合金镀层,通过能谱分析和X射线衍射技术(XRD)研究电镀工艺对Ni-W耐磨镀层成分和结构的影响。采用销-盘式摩擦试验机对耐磨Ni-W合金镀层的耐磨性进行测试,通过磨损失重和磨痕形貌观察评价和分析了Ni-W合金镀层的耐磨性和耐磨机理。结果:在NiTi合金表面所制备的Ni-W合金耐磨镀层的W含量在15.2~20.2 wt%范围内,且镀层致密,无微观裂纹。Ni-W合金镀层的结构是W在Ni中的固溶体。与Ni-Ti合金基体相比,镀有Ni-W合金镀层的Ni-Ti合金试样的磨损失重大幅度降低,耐磨性显著提高;Ni-W合金镀层的硬度和耐磨性随镀层中W含量的增加而增大。结论:直流电镀技术对镍钛合金根管器械进行表面改性可显著提高其耐磨性。
Objective: To study the preparation process and properties of Ni-Ti alloy wear-resistant coatings and to improve the surface hardness and wear resistance of Ni-Ti root canal instruments. Methods: Ni-W alloy coatings were prepared on the surface of NiTi alloy by direct current electroplating. The effects of electroplating process on the composition and structure of Ni-W wear resistant coatings were studied by energy spectrum analysis and X-ray diffraction (XRD). Wear resistance of wear-resistant Ni-W alloy coating was tested by pin-disc friction tester. The wear resistance and wear resistance mechanism of Ni-W alloy coating were evaluated and analyzed by observing wear loss and wear scar morphology. Results: The W content of Ni-W alloy wear-resistant coating prepared on the surface of NiTi alloy was in the range of 15.2-20.2 wt%, and the coating was dense with no micro-cracks. The structure of the Ni-W alloy coating is a solid solution of W in Ni. Compared with the Ni-Ti alloy matrix, Ni-W alloy coated Ni-Ti alloy samples wear significantly reduced wear resistance, wear resistance significantly improved; Ni-W alloy coating hardness and wear resistance with the coating W content increases. Conclusion: DC plating surface modification of nickel-titanium alloy root canal instruments can significantly improve its wear resistance.