3D打印石墨基复合材料及有机涂层浸渍OA

The rheological performance of graphite-based composite(HxBy,where x and y denote the mass contents of sodium-based bentonite H and graphite B,respectively)inks were improved using ammonium chloride(NH4Cl)aqueous solution.HxBy composites were fabricated via direct ink writing(DIW)3D printing combined with a sintering process.By impregnating with epoxy resin(EP)and then calcining,HxBy composites with high flexural strength were prepared.The ink rheology was analyzed using a rheometer,while the material structure was characterized by Fourier transform infrared spectroscopy(FT-IR)and wide-angle X ray diffraction(XRD).Thermal stability,thermal,and electrothermal properties were evaluated via thermogravimetric analysis(TG),scanning electron microscopy(SEM),infrared thermal imaging,and other techniques.The results showed that the bending strength of the H3B7 composites after impregnation and calcination(H3B7/EP/S)was increased by 89.0 times.The H3B7/EP/S composite reached a stable temperature of 266.8 ℃ within 400 s on a 300 ℃(350 W)hot stage.When powered at 3,5,7 and 9 V,the H3B7/EP/S composite achieved temperatures of 42.2,67.8,104.3 and 165.9 ℃ at 600 s,respectively,and exhibited excellent cyclic stability.