3D printing of silicon carbide ceramics based on photopoymerization:Surface oxidation of SiC powder to improve UV curing property of its slurry
In order to prepare SiC ceramics by 3D printing based on photopolmerizaiton,the surface oxidation treatment was proposed to enhance the UV curing property of SiC slurry.The oxidation process of silicon carbide particles,the effects of oxidation temperature and holding time on the oxidation process were analyzed by SEM,XRD and XPS.The rheological and UV curing properties of SiC slurry were analyzed by a dynamic rheometer,an UV spectrophotometer and a digital micrometer.The results show that the UV reflectivity of SiC particles after surface oxidation treatment is significantly improved,up to 48.11％,which is 1.8 times of that of the non-oxidized SiC particles.The UV curing performance of the slurry is obviously improved.Its curing thickness is up to 76 μm as the slurry is exposed under UV light for 5 s,which is 3.6 times of that of the non-oxidized SiC particles.The thickness of the oxide layer increases with oxidation temperature and holding time,up to 144.8 nm.Considering that excessive oxidation is not conducive to the subsequent sintering process for silicon carbide ceramics,the optimal process for surface oxidation of SiC powder is holding at 1100℃for 3.0 h.The slurry with 1％(mass fraction)KOS163 as a dispersant and a solid content of 45％(volume fraction)is successfully printed into 3D SiC ceramic body via 3D printing based on photopolymerization.
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