Theoretical and experimental study on viscoelastic behavior of alumina-agar mixture in agar gelcasting process 

Abstract

This study examined the gel formation behavior and temperature-dependent mechanical characteristics of gel-cast alumina-agar mixtures. The shift from viscoelastic to elastic behaviors, the influence of final agar content, the reversibility of the viscoelastic-elastic transition, and the relationship between complex modulus and temperature were all investigated. The complex viscosity of the mixtures was also investigated to determine their role in ceramic shaping operations. Additionally, we examined the gelling temperature of the agar gelcasting mixture. By putting all rheological parameters into standard oscillatory formulas, the progression of the damping factor was clarified, and its energy dependence was proven. The resultant formulas revealed that the damping factor was able to be explained from both Arrhenius and Eyring tendencies. These findings contribute greatly to our understanding of agar gelcasting behaviors as a ceramic production technology.???????????????????????????????????????????????????????????????????????????????????????????? -??????????????????????????? ??????????????????????????????????????????????????????????????????, ??????????????????????????????????????????????????, ??????????????????????????????????????????????-????????????????????, ???????????????????????????????????????????????? ???????????????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????????????????????????? ???????????????????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????????????????????? ????????????????????????????????????????????????????????????????????????????? ???????? ???????????????????????????????????????????????????????????????????????????????????????????????????????