Application Of Thermal Analysis Technology For Ceramic Sintering Process

Ceramic sintering performance primarily reflected in the sintering temperature.High sintering temperature is not only a waste of energy, but also lead to thedeterioration of ceramic materials. The sintering temperature is too low then theporcelain body is not fully densified, also cannot achieve the desired strength.Therefore the accurate determination of sintering temperature range of ceramicmaterials has very important significance. At present, the traditional measurementmethod of determination of sintering temperature range of ceramic materials is byresistance furnace roasting or refractory determination instrument. However, thetraditional test method is rather complex, and the results are easily affected by humanor the instrument. Meanwhile, ceramic sintering densification rate not only by theeffects of original powder, and is closely related to the heating rate. Therefore, thispaper attempts to use thermal analysis technique for the determination of the sinteringtemperature, and provide experimental basis in the determination of the sinteringtemperature of the ceramic applications by the thermal analysis technique.This paper firstly measured the sintering temperature range of the porcelain,building ceramics and ceramics for daily use by thermal expansion instrument,compared with the test results by traditional test methods, combined with the SEMand XRD test results of ceramic materials in different sintering temperatures. The testresult of ceramic sintering temperature range by thermal expansion instrument isreliable and accurate. Study on sintering characteristics of ceramic materials, therelationship of heating rate and the optimum sintering temperature and the influenceof sintering performance by green body size distribution. Draw the followingconclusions:Thermal expansion instrument determination of sintering temperature range ofceramic materials, not only has the advantages of convenient, and its test resultaccurate and reliable. According to the test results, the sintering temperature range ofthe porcelain is1270-1340℃, the sintering temperature range of the buildingceramics is1240-1260℃, the sintering temperature range of the ceramics for dailyuse is1270-1300℃.The main physical and chemical changes in sintering process of the ceramicgreen body is, room temperature to300℃, mainly to exclude drying failed to excluderesidual moisture,300℃to1000℃,with removal of water and carbonatedecomposition, body weight loss, volume did not change significantly, kaolinite has gradually transformed into the metakaolin,1000℃to the sintering temperature, bodybegins to shrink, and have a strong contraction of the body with the increase oftemperature.The relationship of heating rate and optimal sintering temperature is research bythermal analysis technology. The results indicate that the sintering temperature islinear to the logarithm of heating rate,and the heating rate faster, the optimal firingtemperature is higher.Study the sintering properties as the insulator porcelain body size and itsdistribution are changes. The results showed that with decreasing the particle size ofthe insulator porcelain body and the particle size distribution narrowed, sinteringtemperature decreased gradually, the grain size of the sintered body decreases, thevolume density increasing, open porosity reduces gradually, the bending strengthincreases gradually.