等离子渗氮后纯钛的耐磨性能的研究

摘要

Objective:To study the effects of plasma nitriding on the abradability of pure titanium in vitro. Methods; 24 cast pure titanium specimens were divided into 4 groups ( n = 6). In group 1 the samples were treated by plasma nitriding in artificial saliva, in group 2 by plasma nitriding in 0. 2% NaF, in group 3 by artificial saliva and in group 4 by 0. 2% NaF. The surface roughness( Ra) of the samples was measured before and after brushing for 75 000 times by a tooth brushing machine and observed under SEM. Results : The Ra values were increased by 0. 021 ± 0. 027, 0. 022 ± 0. 037 , 0. 025 ± 0. 015 and 0.046 ± 0. 023 in group 1, 2, 3 and 4 respectively(P <0. 05). Less surface attrition was observed in group 1 and 2. Conclusion; Plasma nitriding may increase the abradability of pure titanium.%目的:模拟口腔环境,研究在牙刷磨耗机的磨擦下,等离子渗氮对纯钛的耐磨性能的影响.方法:铸造纯钛试件24片,随机分为0.2％ NaF渗氮组、0.2％ NaF未渗氮组、人工唾液渗氮组、人工唾液未渗氮组,在牙刷磨耗机上刷洗75 000次,对比刷洗前后的粗糙度Ra增加值及色彩变化,并在扫描电镜下观察试件表面形貌.结果:与未渗氮组比较,0.2％ NaF等离子渗氮后纯钛的表面粗糙度Ra增加值及色彩变化差异均有显著性(P＜0.05)；不同混合液比较,0.2％ NaF溶液对试件的耐磨性能影响较人工唾液的影响大(P＜0.05).SEM观察表明:在0.2％ NaF溶液中刷洗后未渗氮组纯钛试件表面磨耗现象严重.结论:等离子渗氮后纯钛的耐磨性能得到提高；含氟溶液能降低纯钛表面的耐磨性能.