钛涂层厚度和喷涂频次对植入物假体疲劳性能的影响研究OACSTPCD
Effects of Ti coating thickness and spraying frequency on fatigue strength of implants
目的:研究钛涂层厚度和喷涂频次对植入物假体疲劳强度的影响,为假体涂层厚度确定和喷涂工艺管控提供一定的理论依据.方法:根据ASTM F1160-14要求,对300和600 μm厚钛涂层的Ti-6Al-4V合金基体试样施加垂直向下的载荷,直到载荷下降时停止测试,记录各试样在测试过程中的最大极限载荷,并推算弯曲应力.之后对2种试样以正弦波形施加107次垂直向下的循环载荷,得到抗弯曲疲劳的最大弯曲应力值,以确定不同钛涂层厚度对基体疲劳性能的影响.根据ISO 7206-4:2010要求,在1次喷涂涂层和2次喷涂涂层的Ti-6Al-4V合金基体股骨柄柄部施加120～1 200 N的循环载荷,记录股骨柄断裂情况与发生断裂时对应的疲劳循环测试次数,以确定钛涂层喷涂频次对股骨柄耐疲劳性能的影响.结果:300和600 μm 2种厚度的钛涂层试样的极限弯曲应力差异无统计学意义(P＞0.05),而且经过107次循环加载,600 μm试样的最大弯曲应力比300 μm试样仅降低1.5％;在120～1 200 N循环载荷下,1次喷涂钛涂层的3件股骨柄通过500万次循环加载后股骨柄均未断裂,而2次喷涂钛涂层的3件股骨柄分别在循环至18万次、30万次和230万次发生断裂.结论:300和600 μm钛涂层对Ti-6Al-4V合金基体的疲劳性能的影响无显著差异;与1次喷涂钛涂层的股骨柄相比,2次喷涂钛涂层的股骨柄耐疲劳性能明显降低.
Objective To explore the effects of Ti coating thickness and spraying frequency on the fatigue strenght of implants,so as to provide theoretical basis for determining coating thickness and controlling spraying process.Methods A vertically downward load was applied to 300-and 600-μm-thick titanium-coated Ti-6Al-4V alloy substrate specimens until the test was stopped at the drop of the load according to the requirements of ASTM F1 160-14,with the maximum ultimate load of each specimen during the test recorded and the bending stresses deduced.The maximum bending stress values against bending fatigue were obtained by applying 107 times of vertically downward cyclic loads in a sinusoidal waveform to the 2 specimens to determine the effect of different titanium coating thicknesses on the fatigue strength of the specimens.According to the requirements of ISO 7206-4:2010 120-1200 N cyclic loads were applied to the femoral shafts of the alloy substrates after one time and two times of coating,and the fracture situations of the shafts and the numbers of cyclic fatigue tests in case of the fracture were recorded so as to determine the effects of Ti coating thickness on the fatigue strength of implants.Results The maximum beding stress of 600-μm-thick titanium-coated Ti-6Al-4V alloy substrate specimen showed no significant differences with that of 300-μm-thick coated specimen(P＞0.05),which was only lower than the latter by 1.5％after applying 107 times of vertically downward cyclic loads;under 120-1200 N cyclic loads,none of the three femoral shafts with one time of Ti coating fractured after 500 millon times of cyclic loading,while the three femoral shafts with two times of Ti coating fractured at cycles up to 180 000,300 000 and 2.3 million cycles,respectively.Conclusion There is no significant difference between 300-and 600-μm-thick titanium-coated Ti-6Al-4V alloy substrate specimens in fatigue strength;the femoral shaft with two times of Ti coating has the fatigue resistance decreased significantly when compared with the shaft with one time of coating.[Chinese Medical Equipment Journal,2024,45(6):38-43]
陈帅帅
山东新华联合骨科器材股份有限公司研发中心,山东淄博 255035
基础医学
植入物假体钛涂层厚度喷涂频次疲劳性能Ti-6Al-4V合金基体
implantTi coating thicknessspraying frequencyfatigue strengthTi-6Al-4V alloy substrate
《医疗卫生装备》 2024 (006)
38-43 / 6
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