Preparation And Properties Of Yellow Glass-ceramics

Biocrystalline glass is a kind of biomaterial with excellent current performance.Compared with other biomaterials,it has better bioactivity,biocompatibility and processability.It has good biologic fields such as orthopedics,dentistry and bone tissue.Development prospects.Among them,fluoroapatite glass-ceramics have excellent biological activity and biocompatibility,and have a high similarity with the components in teeth.It is a tooth replacement material with great development potential.Like other biological glass-ceramics,fluorapatite glass-ceramics are white and have a certain color difference from normal teeth.When used as an alternative material,they will affect the overall aesthetics of the teeth and limit its development.Ceramic colorants have good chemical stability and high temperature stability,so you can try the combination of colorants and glass-ceramics,while achieving coloration of glass-ceramics,while maintaining the biocompatibility of glass-ceramics.In this experiment,by combining fluoroapatite glass-ceramics with yellow ceramic colorants,the intention is to prepare yellow glass-ceramics with good biocompatibility.Vanadium zirconium yellow and praseodymium zirconium yellow materials were prepared by solid phase method and doped with fluoroapatite base glass.Using X-ray diffraction analysis(XRD),scanning electron microscopy,ultraviolet-visible spectrophotometer,automatic micro hardness tester,etc.,the coloring mechanism of the colorant was analyzed,and the heat treatment system and doping amount on the glass-ceramics were studied.The influence of crystal phase composition,micro-morphology,sintering properties and mechanical properties.The following results have been achieved through research:1.Two pigments of vanadium zirconium yellow and praseodymium zirconium yellow were prepared by solid-phase method.The coloring mechanism of the two pigments was analyzed by calculating the partial transition energy.Studies have shown that the vanadium-zirconium yellow material contains V5+and V4+coloring ions,of which V5+is adsorbed on the surface of the zirconia crystal,and V4+ is dissolved in the zirconia crystal lattice.The preparation temperature has a great influence on the vanadium-zirconium yellow material.Compared with the ultraviolet absorption intensity of the color material,it is more suitable to prepare at 1200℃;the solid phase method to prepare praseodymium zirconium yellow material,by adding a mineralizer,has a higher synthesis rate at 1000℃,through the calculation of transition energy The coloration of the praseodymium zirconium yellow material is caused by the charge transfer transition and df transition of Pr4+ dissolved in the zirconium silicate lattice.2.The base glass was doped with 2 wt%,4 wt%,6 wt%and 8 wt%colorants,respectively,and sintered at 1000℃ to prepare samples.Studies have shown that neither colorant will affect the crystallization type of glass-ceramics,and can promote the precipitation of fluoroapatite crystals,thereby increasing the content of fluoroapatite in glass-ceramic;The comparative analysis of the UV spectrum of the two colors shows that the UV absorption intensity and the doping amount of the praseodymium zirconium yellow material doped glass ceramics show a better increasing law;The sintering performance and hardness of vanadium-zirconium yellow material doped glass-ceramics are superior to those of praseodymium-zirconium yellow material doped glass-ceramics.In terms of hardness,both can meet the requirements of tooth preparation.3.The effect of heat treatment temperature on glass-ceramics when the doping amount of glass-ceramics is 4 wt%is studied.Through experimental analysis,it can be clearly found that when sintered at 900℃,the vanadium-zirconium yellow material reduces the viscosity of the glass-ceramic,thereby inhibiting the precipitation of the diopside crystal phase;However,when sintered at 1100℃,the praseodymium zirconium yellow material had a significant dissolution and crystallization reaction,which further reduced the content of the color material;Thermodynamic analysis and research shows that as the sintering temperature increases,more stable fluoroapatite crystals tend to form in the glass-ceramics;Sintering at 900-1100 ℃,as the heat treatment temperature increases,the stability of the praseodymium zirconium yellow material decreases,and the coloring ability decreases.When the sintering temperature reaches 1100℃,the colorant loses its coloring ability;The vanadium zirconium yellow has better high temperature stability,and the sintering temperature has little effect on the coloring ability.When sintering in the range of 900-1100℃,the hardness of the glass-ceramics increases first and then decreases.At 1000℃,the hardness remains high.4.Combining the researched color glass-ceramics and glass ink technology,the color glass inks are preliminary discussed,and some properties of the glass inks are analyzed,which provides a reference for the next step.