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

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.