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Carreño-Morelli Efraín |
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| Title |
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Effect of particle agglomeration on rheology of alumina feedstocks for powder injection moulding |
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Arias-Serrano B., Thomas-Vielma P., Várez A., Levenfeld B., Martinerie S., Carreño-Morelli E. |
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| References |
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Proc. of European Powder Metallurgy Conference Euro PM2009, Copenhagen, Denmark, October 12-14, 2009, Vol.2, pp. 41-46 |
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| Abstract |
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Homogeneity of feedstocks is one of the important properties to produce injection molded parts of high quality. In this experimental work the effect of agglomeration in the starting powder of alumina feedstocks was analysed. Two pre-treated powders, one precoated with SA and a spray dried powder, were used for comparison with the as received powder. Alumina feedstock was prepared with 58 vol.% of powder and a binder system based on high density polyethylene (HDPE), paraffin wax (PW) and stearic acid (SA). The mixing process was optimized by means of mixing torque measurement. Rheological behaviour of three feedstocks was analysed using capillary rheometer. All the feedstocks exhibited a pseudoplastic behaviour with n < 1 according to the Ostwald de Waele power law. Feedstocks with spray dried powder showed the lowest viscosity and allow sintered parts to incorporate higher ceramic loading with lower shrinkage, higher densities and better final properties. |
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