不同烧结温度的钛硅涂层对钴铬合金耐腐蚀性能的影响

Effects of Ti Si coatings with different sintering temperature on corrosion resistance of dental Co Cr alloy

目的研究不同烧结温度下的钛硅(Ti Si)涂层对牙科软质钴铬合金(Co Cr)耐腐蚀性能的影响。方法选用临床常用的软质钴铬合金,制作成10mm×10mm×1mm规格的试件18件,将试件随机分成A、B、C 3组(n=6),在B、C组试件表面运用溶胶-凝胶法涂覆钛硅薄膜,分别设定900℃和1000℃的烧结温度。将A、B、C组试件分别浸于37℃乳酸/Na Cl溶液中7天,然后利用失重法计算材料的腐蚀速度,并运用等离子体发射光谱仪(ICP-AES)对溶液进行分析,以获得3种试件离子析出量的差异。结果 B、C 2组试件间腐蚀速度没有显著性差异(P>0.05),但都低于A组试件。离子析出量分析显示,B、C 2组试件的Co、Cr、Ni及总的离子析出量均少于A组试件(P<0.05),B组试件的Co、Cr、Si及总离子析出量显著高于C组试件(P<0.05)。结论钛硅涂层可显著提高软质钴铬合金的耐腐蚀性能,1000℃获得的钛硅涂层抗蚀性能优于900℃。

Objective To investigate the effects of titanium-silicon （TiSi） coatings with different sintering temperature on corrosion resistance of dental soft CoCr alloy. Methods The commonly used soft CoCr alloy was cast into 18 specimens of size 10mm × 10mm ×1 mm. These specimens were randomly divided into three groups （group A, B and C） （n=6）. Then the specimens of group B and C were coated with TiSi on the surface by sol-gel method. The specimens of group B were sintered at 900℃, while the sintering temperature of group C specimens was 1000℃. The specimens of groupA, B and C were immersed in a lactic acid/NaCl solution at 37℃ for 7 days. The method of weight loss was used to analyze the corrosion rate. The solutions were analyzed with ICP-AES to determain the release of elements. Results In the analysis of weight loss method data, there were no significantly differences in corrosion rate between group B and C （P〉0.05）. The corrosion rates of group B and C were lower than that of group A （P〈0.05）. The specimens of group A released significantly more ions （Co, Cr, Ni,and total ions） compared with the group B and group C specimens （P〈0.05）. The levels of Co, Cr, Si and total ions were higher in specimens of group B than that in group C （P〈0.05）. Conclusion TiSi coating can significant improve the corrosion resistance of soft CoCr alloy. The TiSi coating sintered at the temperature of 1000℃ showed bettercorrosion performance than that of 900℃ .