Hot moulding of zirconia micro parts
Zirconia micro parts were fabricated by a sequence of process steps. A master model (a positive to the final ceramic part) was copied into a silicone rubber mould insert and the rubber mould insert was used for producing ZrO2 prototypes by hot moulding. Hot moulding was carried out with suspensions of ZrO2 in a mixture of paraffin and a dispersant. The rheological properties of different commercial ZrO2 powders were tested with respect to their hot moulding application. A different sequence of process steps was developed to be able to start with a negative and to fabricate the ceramic micro parts as positives. This sequence included as a final step that the hot-moulding feedstock was filled into a mould insert which consisted of an organic material. Debinding was carried out without prior separation of the green body and the mould insert (lost mould technique).
Key wordsZirconia Micro part Hot moulding Viscosity Feedstock
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