Research On Preparation Technology And Properties Of Zinc Oxide Ceramics By DLP 3D Printing

Zinc oxide ceramic materials have excellent photoelectric and thermoelectric properties and are widely used in sensors,energy and other fields.However,it is difficult to produce high precision zinc oxide ceramics with complex structure by traditional molding methods due to the high brittleness and high melting point of ceramics.In this thesis,three parts of work were carried out for research on preparation technology of zinc oxide ceramics based on DLP 3D printing,and it was applied to the preparation of three-period minimal curved surface（TPMS）structural zinc oxide ceramics with high specific surface area and excellent heat dissipation:（1）Preparation of Zn O ceramics slurry for DLP was studied based on its dispersibility,fluidity and photosensitivity,and the Zn O ceramic slurry with moderate viscosity and excellent dispersibility was prepared.The experimental results showed that 2 wt%BYK111 dispersant can effectively reduce the hydrophilic group（-OH）on the surface of powder particles,which is beneficial to the preparation of low viscosity and high powder content slurry.The prepared UV-curable ceramic slurry contains 2wt%photoinitiator dose of relative resin mass and 38 wt%Zn O powder.The photosensitive characteristics follow Beer-Lambert law and its critical exposure energy is 61.56 m W/cm~2,which provides theoretical guidance for the subsequent printing parameter setting.（2）Based on the experimental data of TG-DSC,the heat treatment technology of zinc oxide ceramic green body was studied.The key temperature points of debinding curve were determined,and the resin was completely removed at 600 ^OC.According to the shrinkage rate,crystal quality and microstructure of the Zn O ceramics,the best sintering heat treatment process parameters was at 1250 ^OC for 1.5 h.The performance test of the zinc oxide sample block prepared by the best heat treatment process was carried out.According to the performance characterization test,the component of the zinc oxide ceramics is single,with hexagonal wurtzite structure,and no other impurities.The SEM analysis showed that the Zn O ceramics has good microstructure,full grain growth,tight bonding,with only a small amount of 0.2-0.4μm micropores.The relative density is 93.48%.The fine structure of Zn O ceramics can be up to 200μm in diameter,which provides the conditions for the later preparation of Zn O ceramics with TPMS structure.（3）Two kinds of TPMS（Gyroid structure and Schwartz P structure）Zn O ceramics were prepared by DLP printing technology.The mechanical properties of the two kinds of structural ceramics were simulated by finite element method and tested.The result shows that the Gyroid structural Zn O ceramics can bear much more deformation than the Schwartz P structure during the compression tests.And the compressive strength is greater than that of Schwartz P ceramics.The TPMS structural Zn O ceramics can be used in the field of sensing and detection in the future.