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Preparation of Ceramics Coatings on Titanium by Microarc Oxidation Technique Institute Opaque Porcelain

Author: TangHui
Tutor: YuDeZhen
School: Harbin Institute of Technology
Course: Materials Science and Engineering
Keywords: Titanium Micro-arc oxidation Opaque porcelain Tensile strength
CLC: TG174.453
Type: Master's thesis
Year: 2008
Downloads: 53
Quote: 1
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Abstract


This study was prepared by micro-arc oxidation ceramic membrane technology to replace the titanium crown of opaque porcelain, to change the traditional ceramic process, reducing tooth preparation when cutting the amount of tooth structure to make porcelain crown color better, increasing titanium porcelain bonding strength. In Na 3 PO 4 -FeSO 4 -Ce (NO 3 ) 3 -Mg (CH 3 COO) 2 and K 2 ZrF 6 -FeSO 4 -Ce (NO 3 ) 3 electrolyte system, through the mediation of electrolyte formulations and power of process parameters on the surface of TA2 prepared colors and porcelain teeth opaque porcelain color similar oxidation ceramic coating. Using scanning electron microscopy (SEM) observations of the surface oxide film, cross-sectional shape; X-ray diffraction pattern (XRD) analysis of the phase composition of the oxide film; X-ray energy dispersive spectroscopy (EDS) on the oxide film composition and its distribution were analyzed ; tensile test for detection of the substrate film and the bonding strength; hand-held spectrophotometer color film. In Na 3 PO 4 -FeSO 4 -Ce (NO 3 ) 3 -Mg (CH 3 COO) 2 system, by regulating electrolyte ferrous sulfate and cerium nitrate concentration and power parameters prepared a pale yellow, yellow, light reddish brown, dark brown oxide film; in K 2 ZrF 6 - FeSO 4 -Ce (NO 3 ) 3 system prepared a slightly milky white, cream and milk yellow ceramic coating. And the film and the substrate combination of high strength, much larger than the ISO porcelain bond strength requirements 25MPa. With Fe, Ce element oxide film layer changes in the relative content of a different color, the film increases in the relative content of iron, the film was red; film is relatively high content of cerium element when the film was yellow. By adjusting the micro-arc oxidation electrolyte composition and power parameters oxide film can be adjusted relative content of each element, and then control the color of the film. The concentration of ferrous sulfate electrolyte increases, the film of the red deepened; electrolyte increases the concentration of cerium nitrate, deepening yellow film; power of positive and negative phase voltage increases, are conducive to iron, Cerium into the film, making the film's color to red and yellow offsets. Pulse frequency power oxide layer almost does not affect the color. Color distribution of the film in the people within the chromaticity distribution of teeth in Na 3 PO 4 -FeSO 4 -Ce (NO 3 ) 3 -Mg (CH 3 COO) 2 system ideal film prepared tooth color L value is close to the people The minimum range, the color close to the color of discolored teeth. In K 2 ZrF 6 -FeSO 4 -Ce (NO 3 ) 3 system, the oxide film prepared in the best color distribution closer to the normal range of color distribution of the tooth.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Inorganic complex layer of protection > Ceramic stratified
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