Abstract
The rheological behaviour of an alumina injection moulding suspension was studied. A capillary rheometer allowing working under accurate injection moulding conditions has been developed. The main result concerns the observed slip phenomenon. It was shown that wall slip is reinforced with higher temperatures and decreasing shear rates. An attempt was made to correlate the results of the rheological study with the emergence of injection moulding defects. Normal filling was observed at low temperature, but solid jetting appeared under high temperatures and low shear rates. This unusual behaviour is a consequence of the wall slip mechanism. At low temperatures, when no slip was detected on rheological measurement, a steady front flow takes place. At higher temperatures, wall slip is favoured to shearing and unsteady front flow is obtained.
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