3D Printing Of Colored Glaze

SrAl₂O₄: Eu²⁺,Dy³⁺ is a persistent afterglow material that can intensively glow for a long time.In recent years,it has been utilized to prepare colored glaze crafts.The current method to fabricate colored glaze works with complex shape is lost wax casting which requires the production of several models with different materials.The entire process includes more than ten procedures with high produce difficulty,high cost and a relatively low success rate.Based on this,the aim of this project is to develop a high solid loading slurry of raw colored glaze powder dispersed in a novel photosensitive resin with low viscosity synthesized by ourselves,suitable for 3D printing?stereolithography or digital lighting processing?and obtain high quality colored glaze samples with complex shapes after improving 3D printing parameters,debinding curve and sintering process.The optimal formulation of photosensitive resin is 2 wt.% photoinitiator,18 wt.% prepolymer,and 80 wt.% reactive diluent.It exhibited the best fluidity among all prepared photosensitive resins and was used in follow-up research.The influence of colored glaze powder content,dispersant content,powder particle size,and preparation method on the viscosity of colored glaze/photosensitive resin slurry was described in this dissertation.The results showed that 78 wt.% colored glaze/photosensitive resin slurries with a viscosity < 3000 m Pa·s were successfully prepared by a three-roll grinder.3D printing of prepared colored glaze slurries were tested successively using two 3D printers: Form 2 and DLP 800 d.Due to higher laser power and adjustable printing parameters,cure depth of slurry could be modified and better colored glaze green parts were printed with the DLP 800 d printer.The printing parameters were optimized as follows: 50 ?m layer thickness,7000 ms exposure time and 65 brightness.Further study included the investigation on debinding and sintering process of colored glaze green parts.8 mm solid cube?78 wt.% solid content?kept its original appearance with the removal of all polymers from the colored glaze green part.The feasible debinding process is as follows: 2 ?/min heating rate between room temperature and 50 ?,0.1 ?/min between 50 ? and 500 ? and 2 ?/min between 500 ? and 600 ? with holding time for several times throughout the heating process.Colored glaze component with 96.26% density and 845.1 HV hardness was fabricated after a subsequent hot isostatic pressing?HIP?under 1400 ? and 180 MPa?Ar atmosphere?for 6 h,whose linear shrinkages of X-axis,Y-axis and Z-axis were 8.50%,7.50% and 10.50%,respectively.The project pioneered a series of researches and analyses centering around 3D printing of colored glaze and achieved colored glaze samples with relative high density,indicating the feasibility of the preparation of colored glaze handicrafts via a DLP process.