Abstract
All-ceramic artificial teeth are made by High-speed Centrifugal Compaction Process (HCP), combined with resin shell mold made by 3D printer. By the process, we can avoid essential problems for on- demand ceramic duplication process, such as shrinkage during sintering, use of high-cost metal dies for high pressure compaction, etc. A shell type resin mold with 0.4 mm thickness is made by UV-hardening 3D printer. The shell is buried in alumina slurry, then compacted by the HCP. The alumina powder is densely compacted (63%) in the mold without breaking or deforming thin walled shell molds, since the applied pressure during the HCP is almost isotropic, that is, no remarkable stress is forced on the molds. The mold is taken off by thermal decomposition in a furnace (N_2 atmosphere). The shape and surface microstructure of sintered compact have good coincidence with that of shell mold, as well as CAD data.
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