Pu Jiang, Dai Yan, Li Kunmao, Chen Li
School of Physics and Mechatronic Engineering, Guizhou Minzu University, Guiyang 550025, China.
School of Materials and Architectural Engineering, Guizhou Normal University, Guiyang 550025, China.
Materials (Basel). 2025 Mar 5;18(5):1160. doi: 10.3390/ma18051160.
Due to its excellent specific strength, corrosion resistance, and biocompatibility, titanium alloy is often used as a biological implant material. In order to address the issues of low hardness and poor wear resistance of the Ti-25Nb-3Zr-2Sn-3Mo titanium alloy, a TiN/Sn coating with good biocompatibility was deposited on its surface using a new composite modification technology of surface mechanical strengthening + surface mechanical coating. By taking advantage of the wear resistance of TiN and the adhesiveness of Sn, a composite coating with corrosion-wear resistance was formed to improve its corrosion-wear resistance. Using TiN/Sn powders of different ratios (10% Sn, 20% Sn, 30% Sn, and 40% Sn) as media, the alloy was subjected to a combined strengthening treatment of surface mechanical attrition and solid-phase coating under a nitrogen atmosphere. The microstructure and mechanical properties of the composite-strengthened layer were tested by means of XRD, SEM-EDS, a nanoindentation tester, a white-light interferometer, and a reciprocating wear tester. Moreover, the corrosion-wear properties of the samples under different loads and electrochemical conditions were analyzed. The results show that the surface composite-strengthened layer of the alloy consisted of a TiN/Sn coating + a mechanical deformed layer. With an increase in the Sn content, the thickness of the TiN/Sn coating continuously increased, while the thickness of the mechanical deformed layer continuously decreased. The composite-strengthened layer had good comprehensive mechanical properties. In the SBF solution, the corrosion-wear resistance of the composite-strengthened samples improved; the degree of wear first decreased and then increased with the increase in the Sn content, and it reached the optimal value when the Sn content was 30%. Compared with the raw sample, the corrosion of the coating sample increased, but the wear significantly decreased. The corrosion-wear synergy factor κ value first increased and then decreased with the increase in the Sn content, reaching a maximum value at the 20% Sn content. This is the result of the combined effect of the corrosion resistance and wear resistance of the coating.
由于钛合金具有优异的比强度、耐腐蚀性和生物相容性，常被用作生物植入材料。为了解决Ti-25Nb-3Zr-2Sn-3Mo钛合金硬度低、耐磨性差的问题，采用表面机械强化+表面机械涂层的新型复合改性技术在其表面沉积了具有良好生物相容性的TiN/Sn涂层。利用TiN的耐磨性和Sn的附着性，形成了具有耐腐蚀磨损性能的复合涂层，以提高其耐腐蚀磨损性能。以不同比例（10%Sn、20%Sn、30%Sn和40%Sn）的TiN/Sn粉末为介质，在氮气气氛下对合金进行表面机械研磨和固相涂层的复合强化处理。通过XRD、SEM-EDS、纳米压痕测试仪、白光干涉仪和往复磨损测试仪对复合强化层的微观结构和力学性能进行了测试。此外，分析了样品在不同载荷和电化学条件下的腐蚀磨损性能。结果表明，合金表面复合强化层由TiN/Sn涂层+机械变形层组成。随着Sn含量的增加，TiN/Sn涂层的厚度不断增加，而机械变形层的厚度不断减小。复合强化层具有良好的综合力学性能。在模拟体液（SBF）溶液中，复合强化样品的耐腐蚀磨损性能得到提高；磨损程度随Sn含量的增加先降低后升高，当Sn含量为30%时达到最佳值。与原始样品相比，涂层样品的腐蚀增加，但磨损显著降低。腐蚀磨损协同因子κ值随Sn含量的增加先增大后减小，在Sn含量为20%时达到最大值。这是涂层耐腐蚀性和耐磨性共同作用的结果。
