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Rheology of dispersions of plasma-processed fine alumina in epoxy resin

100%

Jakobsons E. , Palcevskis E.

International Journal of Applied Mechanics and Engineering

2005

tom Vol. 10, no spec

225-232

The rheological properties (flow curves and the viscoelastic behavior) of the dispersions prepared from plas-ma-processed Al2O3 powders and epoxy wax were investigated on wide ranges of shear rates (from 0.018 to 1350s-1) and frequencies (from 0.063 to 157s-1). Oleic acid and Hypermer LP1 was chosen as dispersants for preparation of the dispersions. It is stated that, at the concentration f ? 15 vol. %, for the composites studied, a spatial particle-particle network structure arise, which is broken at a critical stress s0. The slippage of the sample against the surface of rheometer tools was tested by mutual collation of test records obtained with the cone-plate and cylinder-cylinder equipments. The results showed that the influence of dispersants is the most pronounced if the composite has a spatial particle-particle structure.

Rheology of concentrated suspensions of plasma-processed fine alumina

80%

Jakobsons E. , Faitelson L. , Palcevskis E.

International Journal of Applied Mechanics and Engineering

2003

tom Vol. 8, no spec.

251-258

The rheological properties (flow curves and viscoelastic behavior) of the injection-moulded suspensions prepared from two nanosized plasma-processed Al2O3 powders and water were investigated on wide ranges of shear rates and frequencies . Tiron (disodium salt of 4,5-dihydroxy-1,3-benzene-disulfonic acid) was chosen as a surfactant for preparation of the concentrated alumina suspensions. It is stated that, at an optimal Tiron content in suspensions, their viscosity, yield stress, and complex shear modulus have minimal values. A correlation was shown to exist between the optimal concentration of the dispersant obtained by rheological tests on the alumina powder water suspensions and the mentioned optimal concentration determined by measuring the zeta potential.

Rheology of injection moulding suspension prepared from nanosized plasma processed AlN powder

80%

Palcevskis E. , Jakobsons E. , Faitelson L.

Applied Mechanics and Engineering

1999

tom Vol. 4, no spec.

375-380

The rheological properties (flow curves and viscoelastic behavior) of injection moulding suspension prepared from nanosized plasma processed AlN powder and paraffin wax were investigated in the broad region of shear rates (0.07-1350 s-1). Two viscosity platoaux are observed on the flow curves and the values of two yield stresses are obtained. The linear viscoelastic region is not reached at the lowest deformation amplitude (0.66 %). Higher values of dynamic viscosity than those of effective viscosity at 'gamma'='omega' are observed in all the range of the used frequency and shear rate (0.1-80 s-1). The rebuilding of destroyed particle packing structure during ultrasound or shear treatment is observed. It results in the dependence of rheologic properties on the pretreatment history of suspensions.