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J. Korean Ceram. Soc. > Volume 36(12); 1999 > Article
Journal of the Korean Ceramic Society 1999;36(12): 1281.
알루미나 콜로이드 현탁액의 응공와 요변성
이상진, 박홍채1, 전병세
경남대학교 무기재료공학과
1부산대학교 무기재료공학과
Coagulation and Thixotropy of Alumina Colloidal Suspension
ABSTRACT
The coagulation and thixotropic behaviors of alumina colloidal suspensions containing alumina cements were inves-tigated. To prepare stable colloidal suspensions 0.2wt% dispersing agent (NH+ salt of polymethyl acrylic acid) was added. The concentrations of ions dissolved from alumina cements the zeta potential the relations between shear stress and shear rate and the viscosity of the suspensions were examined as a function of the alumina cement contents. The suspension pH and the apparent viscosities were increased with increasing th contents of alumina cement but the zeta potentials were decreased. However the apparent viscosities of suspensions were decreased with increasing shearing time (0-60 minutes) at the constant shear rate(122sec) and the elastic strain behaviors were revealed when the stresses were removed. From the plot of shear rate and shear stress the suspension showed a typical thixotropic behavior
Key words: Thixotropic behavior, Coagulation, Elastic strain, Zeta potential, Viscosity pH
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