Research On High-throughput Dyeing Of Zirconia Ceramics

Because of its excellent properties such as high hardness,high strength,high toughness,and chemical resistance,zirconia ceramics are currently widely used in various fields,such as molds,tools,oxygen sensors,refractory materials,solid fuel cells,etc.In recent years,with the rapid development of high-end decorations in the market,people’s demand for high-end decoration materials such as watch cases,bracelets,bracelets,gems,etc.has increased.Zirconia ceramics have high strength,high hardness,and good toughness.The excellent performance of high refractive index,beautiful gem gloss and safety and environmental protection have attracted wide attention.However,currently there are only two types of color zirconia ceramics mass-produced in the market,black and white,and other colors of zirconia ceramics are not yet mature.Therefore,the research and development of colored zirconia ceramics has important research significance and market prospects.In this research,the high-throughput method of inkjet printing is the first choice to quickly realize the combination of colors.The first part:through inkjet printing,the compatibility between colors is realized,and then the data is analyzed to find the rules,and a new zirconium oxide dyeing system is designed.Finally,the zirconium oxide color ratio interface is designed to select specific colors..The second part:the use of impregnation doping technology to prepare colored zirconia ceramics with specific colors,using Co（NO₃）₂·6H₂O,Er（NO₃）₃·5H₂O and other colored ionic compounds for dyeing,and exploring the effects of different sintering temperatures The influence of zirconia ceramics on color and mechanical properties.The third part:According to the suitable sintering conditions explored above,hydrogen gas is introduced to reduce at different temperatures.After sintering,the color value CIELab,mechanical properties,and optical properties of the sample are analyzed and characterized.The main research results are as follows:（1）Because the color of zirconia ceramics is still relatively small,and there is no suitable dyeing system.In this research,we choose the high-throughput method of inkjet printing,which can realize the combination of colors efficiently and quickly.Then in the Lab system,by reading the color rendering data of a single color in the 106 color table,the relationship between a single color ion and color rendering was analyzed,and four basic colors were prepared,based on the calculation of the color difference value The formulaΔE=[（△L*）²+（△a*）²+（△b*）²]calculated that the difference between the theoretical value and the actual sampleΔE is less than 4,and the result is within the acceptable range.Finally,a new zirconia color ratio system was designed.By using this system,you can quickly,efficiently and accurately know the configuration information corresponding to each color,improve the efficiency of the experiment,and do a good job in the color management of the zirconia ceramic inkjet printing,and finally achieve What you see is what you get in inkjet printing of zirconia ceramics.（2）Based on the successful design of the color system,five representative colors were selected to study the effect of different sintering temperatures on the chromatic and mechanical properties of colored zirconia.The sintering temperature was selected as 1450℃,1500℃,1550℃,the color and mechanical properties of the samples were compared and analyzed.The experimental results show that the samples can be sintered at a sintering temperature of 1500℃to obtain denser colored zirconia ceramics,with a relative density of 99.7%.In the three-point bending experiment of the colored zirconia ceramic test strip,the highest bending strength can reach 550 MPa.In the chromatic characterization,we can see that the sintered samples,from the lightness L value,the lightness of the five groups all decrease slightly with the increase of temperature.From the chromaticity values a and b,as the temperature increases,the chromaticity values of various colors have changed.The a and b values of pink and yellow increase with the increase in temperature,indicating the red component There are more and more components of yellow and yellow,the saturation of the color increases,and the color becomes darker;the a and b values of purple and blue show a downward trend with the increase in temperature,and the downward trend is fast and then stabilized,indicating that the blue The components of both green and green have increased,and the color changes to blue-green and gradually tends to be stable;the a value of light yellow does not change significantly with the temperature,and the b value increases slightly with the increase of temperature,indicating that the yellow value is slightly There is an increase,and the sample turns yellow as the temperature increases.Combining the results of L,a,b values and mechanical properties,we comprehensively selected a sintering temperature of 1500°C.The dyed colored zirconia ceramics have better mechanical properties and chromatic effects,which increases the possibility of using colored zirconia ceramics in high-end decorations and dental clinical medicine.（3）Finally,we applied hydrogen to the sample after sintering at 1500℃for different temperature reduction,and discussed the influence of different reduction temperature on the chromaticity and mechanical properties of colored zirconia.The results show that at a reduction temperature of 1200℃,sintering in a nitrogen-hydrogen mixed gas atmosphere can obtain dense colored zirconia ceramics with a relative density of 99.5%.The flexural strength of the colored zirconia ceramic test strip can reach 480 MPa in the three-point bending experiment.In chromatic characterization,the sample has the highest brightness at 1200℃.The chromaticity values a and b change with the increase of temperature.Among them,the a and b values of pink and light yellow samples increase with the increase of temperature,and the change is obvious.The saturation of the color increases,and the color changes.Dark and light yellow change is the most obvious.As the temperature rises,it gradually turns into a bright orange red at 1200℃.As the temperature rises again,the color gradually darkens.In addition,the values of a and b of the purple and blue samples showed a downward trend with the increase in temperature.The downward trend was first fast and then stabilized,indicating that the blue and green components increased,and the samples gradually tended to blue-green.At 1200℃,the color saturation of the sample is the highest.Combined with the change trend of Lab value,the color effect of the sample reaches the best at 1200℃.To sum up,in this article,we have successfully designed the color system of colored zirconia.Through the study of the sintering temperature,it is known that the color difference of colored zirconia is the smallest at 1500℃and has relatively high mechanical properties.When a reducing atmosphere is introduced,sintering at a reduction temperature of 1200°C can obtain colored zirconia ceramics with better mechanical properties and color characteristics,which improves the possibility of further industrial production and application of colored zirconia ceramics.In the next further research,we need to study more colorful colored zirconia ceramics and their basic properties and chromatic characteristics to enrich the color system and market applications of zirconia.