Abstract:
The work is devoted to the low-temperature synthesis of porous ceramic materials based on finely dispersed SiC with sintering silicon oxide and magnesia binders. Particular attention is paid to the influence of the shape and morphology of the particles of the initial powder components on the structural parameters and characteristics of porous ceramic materials. Silicon carbide-based membranes sintered at maximum temperatures from 1000$^\circ$C to 1300$^\circ$C had average pore sizes from 0.5 to 1 $\mu$m, open porosity up to 50%, flexural strength up to 48.5 MPa and high water permeability up to 7890$l$$\cdot$ m$^{-2}$$\cdot$ h$^{-1}$$\cdot$ bar$^{-1}$. The established filtration efficiency was $\sim$99% while maintaining stable permeability and physical and mechanical characteristics after multiple filtration-regeneration cycles. The obtained new knowledge about the influence of the morphology of the initial powders on the parameters of the pore space and the physical and mechanical characteristics of the synthesized porous ceramics expands the possibilities of correct prediction and provision of specified parameters of the structure and properties of materials. The results of this work can be used for the production of porous SiC membranes with high energy efficiency and technological simplicity, highly effective for micro- and ultrafiltration processes, and also having the potential for use as substrates for catalysts.
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