不同浓度钛酸钡涂层对钛瓷结合强度的影响

The effects of different concentrations of barium titanate coatings on titanium porcelain bonding strength

目的:研究采用溶胶凝胶法在纯钛表面制备的,不同浓度钛酸钡涂层对钛瓷结合强度的影响。方法:采用随机数字表法将40个纯钛试件(25mm×3mm×0.5mm)随机均分为五组,编号A、B、C、D、E,其中A、B、C、D为实验组,分别镀0.25mol/L、0.30mol/L、0.35mol/L、0.40mol/L的钛酸钡涂层,E为对照组不镀膜。以碳酸钡和钛酸丁酯作为原料制备不同浓度的钛酸钡溶胶,利用溶胶凝胶法在实验组纯钛试件表面制备钛酸钡涂层,扫描电镜观察其表面形貌。从每组随机抽取6个试件,并在每个试件中份烧结瓷粉,最后用三点弯曲试验测定并比较各组试件的钛瓷结合强度。结果:A组到E组的钛瓷结合强度值分别为32.52±3.67MPa、43.28±4.14MPa、36.36±4.11MPa、33.41±3.22MPa、27.42±4.22 MPa。B组试件结合强度最高,与A组、C组、D组、E组相比钛瓷结合强度差异有统计学意义(P<0.05)。结论:在所选浓度中0.30mol/L的钛酸钡溶胶制备的涂层裂纹最细少均匀,且表面最为平整连续,对钛瓷结合强度提高最明显。

Objective： To evaluate the effects of different concentrations of barium titanate coatings made by sol-gel method on titanium porcelain bonding strength. Methods： 40 pure titanium specimens（25mm×3mm×0.5mm） were randomly divided into five groups（n=8） — Group A, B, C, D and E. Barium titanate coatings with the concentrations of 0.25mol/l,0.30mol/l, 0.35mol/l, 0.40mol/l were treated on Group A, B, C and D, while no barium titanate films treated on the contrast group. To make barium titanate sol with barium and butyl titanate, barium titanate coatings were prepared on specimens of each experimental group, of which the surfaces＇ morphology were evaluated by scanning electron microscopy. Porcelain was fused on six specimens selected from every group, and the titanium porcelain bonding strength were measured and analyzed.Results： The titanium porcelain bonding strength（MPa） from Groups A to E were 32.52±3.67, 43.28±4.14, 36.36±4.11,33.41±3.22 and 27.42±4.22 respectively. Barium titanate coating of 0.30mol/l gained shows the highest titanium porcelain bonding strength, and there was a significant difference between Group B and the rest of the groups（P〈0.05）. Conclusions：Among the concentrations tested, 0.30 mol/l sol formation of barium titanate thin film shows the highest titanium porcelain bonding strength.