The Technical Analysis Of Yuezhou Kiln Celadon And Comparative Study Of Hongzhou Kiln

Yuezhou kiln is located in Xiangyin county,it is also known as Xiangyin kiln.In the Eastern Han Dynasty,Yuezhou kiln began to make celadon,and its burning history continued through the Tang Dynasty.The tea culture of the Tang Dynasty prevailed,and the tea sets that flourished in Yuezhou Kiln were loved by people and listed as one of the six famous kilns.The kiln site of Yuezhou was excavated in the 1850s,causing great concern.Since the site of the kiln was discovered,scholars have mainly studied from the archaeological point of view,and very few have studied from the perspective of science and technology.In this study,energy-dispersive X-ray fluorescence spectrometry non-destructive test analysis technology was used to test the Yuezhou kiln celadon samples,and analyzed the chemical composition of glaze and body in different periods of Yuezhou.Samples of Tang Dynasty and Hongzhou kiln in the same period were also selected,to compare and explore the porcelain-making process relationship between these two porcelain kilns.In addition,this study also used a high-temperature thermal dilatometer to determine the firing temperature.The water absorption,apparent porosity and bulk density were measured by boiling method and hydrostatic weighing method,and the scanning electron microscope was used to observe the microstructure.Attempts were made to explore the evolution and development of the craftsmanship and technology of different historical dynasties from the aspects of the inherent physical properties,chemical composition and microstructure of the artifacts.Through research,this paper draws the following conclusions:（1）From the Eastern Han Dynasty to the Tang Dynasty,there were subtle differences in the formula of the body and glaze of Yuezhou kiln celadon.For porcelain bodies,they were made of sedimentary clay with a high aluminum content as raw material.The content of Fe₂O₃ and TiO₂ in porcelain porcelain is high,which affects the color of the the matrix,which makes the porcelain of the Yuezhou kiln generally grayish.In terms of enamel,Yuezhou kiln celadon should be a calcium glaze incorporating grass ash.（2）The firing temperature of Yuezhou kiln celadon is around 1200°C.During the Eastern Han and Sui Dynasty,the water absorption and apparent porosity of the samples were lower,the firing temperature was higher,and the sintering degree was better.During the period of Jin and Tang Dynasties,the sample had higher water absorption and apparent porosity,lower firing temperature and poorer sintering degree.（3）The glaze layer of Yueyang kiln is thin and the thickness of the glaze layer is in the range of 200³20um,there is a clear boundary between the enamel,and there are many pores on the surface of the body,there are mullite crystals in the matrix.（4）Comparing the Yuezhou kiln with the Hongzhou kiln,we can see that the raw material for the two-kiln celadon is the same as the sedimentary clay.However,the Fe₂O₃and TiO₂ in Hongzhou kiln porcelain are higher than that in Yuezhou kiln.The color of the porcelain body is deep.In order to cover the color of the body,Hongzhou kiln applied a layer of makeup earth to the surface of the body.In terms of enamel,the chemical compositions of Hongzhou kiln and Yuezhou kiln glaze are similar,and the enamels of both kiln mouths are calcium glazes introduced with grass ash.In addition,the content of Fe₂O₃ in Hongzhou kiln enamel is lower than that in Yuezhou kiln enamel,and the glaze color is not as green as the Yuezhou kiln.As a whole,Hongzhou Kiln and Yuezhou Kiln have no great differences in raw material formulas.The two kiln mouths have similar styles and similar raw material formulas,which indicates that there are technical exchanges and mutual influences between the two kiln mouths.