Effect of Chromium on Stereolithographic Printing with Alumina-Based Slurries
摘要
We have studied the effect of small Cr2O3 and Cr3+ additions on the optical properties of high-purity alumina-based powders and photocurable slurries for 3D printing. The polymerization depth of the slurries has been shown to strongly depend on the amount of the coloring additive in the Al2O3 powders. Using digital light processing (DLP) 3D printing followed by high-temperature sintering, we have obtained thin-walled planar samples of high-density periodic-structure ceramics and studied their microstructure and luminescence properties. Their photoluminescence spectrum contains a sharp strong line in the red spectral region, at 694 nm (characteristic line of ruby). The luminescence decay curves showed single-exponential behavior with a decay time of ~3.7 ms.