Abstract
The rheological properties of dense silica in water suspensions (approx. 50% solids by volume) containing additions of metal oxides were examined. Metal oxides used were ferric, zinc and stannic. To prevent settling, testing was performed in a rheometer which was modified to provide for continual stirring of the materials. Relatively small oxide additions had the effect of thickening the mixtures and making them non-Newtonian. Different rate-limiting steps for flow were identified depending on the particular mixture, testing temperature and shear strain rate. Flow could be described using empirical equations which are identical to those often used to describe plastic flow in solid crystalline materials.
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Abbreviations
- NaTPP:
-
sodium tripolyphosphate
- A :
-
pre-exponential term in eq. (1) (K Pa−1 s−1)
- A′ :
-
pre-exponential term in eq. (3) (K Pa−n s−1)
- C :
-
power law coefficient (Pa−n s−1)
- k :
-
Boltzmann's constant (J K−1)
- n :
-
power-law index
- Q :
-
activation energy (J mol−1)
- R :
-
gas constant (J mol−1 K−1)
- T :
-
temperature (K)
- \(\dot \gamma \) :
-
shear strain rate (s−1)
- \(\dot \gamma _0 \) :
-
pre-exponential term (s−1)
- ΔF :
-
free energy of activation (J)
- η :
-
viscosity (Pa s)
- τ :
-
shear stress (Pa)
- τ y :
-
shear yield stress (Pa)
References
Ferrini F, Ercolani D, de Cindio B, Nicodemo L, Nicolais L, Ranaudo S (1979) Rheol Acta 18: 289
Blaszczyk J, Petela R (1986) Rheol Acta 25: 521
Overend IJ, Horsley RR, Jones RL, Vinycomb RK (1984) 9th Intern Congr Rheology, Acapulco, Mexico
James RO, Healy TW (1972) J Colloid Interface Sci 40: 42
Schindler PW, Fürst B, Dick R, Wolf PU (1976) J Colloid Interface Sci 55: 469
Horsley RR, Jones RL, Snow RJ (1984) 9th Intern Congr Rheology, Acapulco, Mexico
Mayhew YR, Rogers GFC (1976) Thermodynamic and Transport Properties of Fluids, Blackwell, Oxford
Bondi A (1956) In: Eirich FR (ed), Rheology, Theory and Applications. Academic Press, New York
Frost HJ, Ashby MF (1982) Deformation Mechanism Maps, Pergamon Press, Oxford
Chandler HD (1986) Phil Mag A 53: L71
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Chandler, H.D., Jones, R.L. Flow mechanisms in dense silica-metal oxide-water suspensions. Rheol Acta 27, 76–81 (1988). https://doi.org/10.1007/BF01372453
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DOI: https://doi.org/10.1007/BF01372453