The Impact Of Barium Titanate Coating Made By The Electrophoretic Deposition On Bonding Strength Of Titanium Porcelain

Objectives Figure out the perfect technical parameter of making barium titanate coating on pure titanium by electrophoretic deposition with the orthogonal experiment method of four factors and three levels. By examing the bonding strength porcelain-titanium specimen of barium titanate coating made by electrophoretic deposition, and by watching the appearance and structure with scanning electron microscope(SEM) and energyspectrum analysis(EDS), study the impact of barium titanate coating made by electrophoretic deposition on bonging strength of titanium porcelain, and provide experimental evidence for clinical pure porcelain-titanium restoration.Methods 1 Making of barium titanate coating: In terms of ISO9693, make 63 specimens of 25mm×3mm×0.5mm, 7 per group, abrasive blasting the surface of all the specimens. Make nanometer barium titanate powder with barium carbonate, glacial acetic acid and butyl titanate, make barium titanate coating on pure titanium basis by electrophoretic deposition, design 9 groups of experiments by the orthogonal experiment method of four factors and three levels, measure the bonding strength on porcelain, and choose the perfect technical parameter of making barium titanate coating on pure titanium by electrophoretic deposition and check by experiment. 2 Examination of bonding strength of porcelaintitanium: divide 14 specimens into 2groups, control group and experimental group. The control group of 7 specimens(without any conduct, glaze porcelain in the middle(8mm×3mm) of every specimen, 1mm for the whole thickness of porcelain layer), the experimental group(make barium titanate coating under the perfect technical parameter, then glaze porcelain in the middle(8mm×3mm) of every specimen, 1mm for the whole thickness of porcelain layer). Conduct three points bending experiment by electronical universal testing machine, examine the strength of pressure resistance, and watch the appearance and structure with scanning electron microscope(SEM) and energy-spectrum analysis(EDS). Figure out the perfect technical parameter of making barium titanate coating on pure titanium by electrophoretic deposition, make statistical analysis with the orthogonal experiment, compare the porcelain-titanium bonding strength of each group by pair T test.Results 1 Perfect technical parameter of barium titanate coating: sintering temperature of 900℃, deposition voltage of 60 V, deposition time of 60 S, when suspension concentration is 1%, barium titanate coating made by electrophoretic deposition is even and flat with less hiatus. Tested by experiment, porcelain-titanium bonding strength will arrive the maximum in this situation. 2 The impact of barium titanate coating on bonding strength of titanium porcelain: three points bending experiment to examine porcelaintitanium bonding strength shows that by comparing the experimental group and the control group, the difference of porcelain-titanium bonding strength has statistical meaning.Conclusion 1 Perfect technical parameter of making even barium titanate coating on pure titanium by electrophoretic deposition: sintering temperature of 900℃, deposition voltage of 60 V, deposition time of 60 S, when suspension concentration is 1%. 2 Making barium titanate coating on pure titanium by electrophoretic deposition increase the porcelain-titanium bonding strength(P < 0.05). The observation of porcelain-titanium section: macroscopic, some porcelain residue on pure titanium base with an incontinuous grey thin film. In the scanning electron microscope, there are shedding porcelain on the porcelain-titanium bonding interface, in layer or irregular structure. Energy spectrum analysis of fractured porcelain shows that the content of barium residue on pure titanium will increase as the deposition voltage rises.