Study On UV Curing Process Of Ceramic Based On Constrained Surface Projection

Ceramic materials have a series of excellent properties such as high strength,high hardness,high temperature resistance,corrosion resistance,unique electrical and optical properties,and are widely used in high-tech fields such as aerospace,biomedicine,energy,and chemical engineering.Due to the extremely high brittleness of ceramic materials,it is difficult to manufacture complex and high-precision ceramic parts.The use of constrained surface projection light curing technology(DLP)can realize the direct forming of complex ceramic parts,which can shorten the manufacturing cycle and reduce the manufacturing cost.The thesis focuses on the impact of ceramic particles on the light propagation characteristics and material rheology and the process reliability and molding accuracy in the ceramic light curing molding,and provides basic data and a theoretical basis for process optimization for the constrained surface projection ceramic light curing process.In the ceramic DLP process,the photopolymerization of the ceramic slurry in the photosensitive resin is the basic step of molding,and the ceramic particles in the ceramic slurry affect the light transmission characteristics,thereby affecting the photopolymerization behavior.The paper uses the finite difference time domain method to study the influence of ceramic particles on the light intensity distribution in the molding area.The results show that the particle size and refractive index of the ceramic powder have a significant effect on the light propagation characteristics.The closer the particle size is to the wavelength of the light source,the more severe the light wave scattering;the closer the particle refractive index is to that of the photosensitive resin,the smaller the particle scattering and the greater the light transmittance.In order to meet the low viscosity and fluidity and good requirements of the ceramic slurry in the DLP process,the silica ceramic powder was modified first,and the amount of dispersant,ceramic particle size,ceramics in the preparation process of the silica ceramic slurry was studied.The effect of solid content on the rheological properties and stability of the slurry.The results show that a powder with a low specific surface area and a morphology close to a spherical shape is beneficial to the preparation of a slurry with high solid content and low viscosity;the viscosity of ceramic slurry increases with the solid content Increase with increase;at the same solid content,the smaller the particle size of micron ceramics,the greater the viscosity of the slurry,and the better the stability of the slurry;the best addition amount of slurry dispersant is 2wt.%.The multiple scattering effect introduced by ceramic particles in the photosensitive resin photocuring reaction system increases the complexity of molding.The paper systematically studied the effects of exposure time,ceramic slurry solid content rate and ceramic particle size on the curing process during the photocuring molding process.The influence law,the relationship between the exposure time and the curing thickness under the conditions of different solid content and particle size is obtained,and a preliminary study and analysis of the forming error of the parts in the DLP-based ceramic forming process are carried out.