SILICON CARBIDE CLOSED-CELL CERAMIC PREPARED BY USING INDUSTRIAL SILICON-BASED WASTE RESIDUE AND PREPARATION METHOD THEREFOR

摘要

Disclosed are a silicon carbide closed-cell ceramic prepared by using an industrial silicon-based waste residue and a preparation method therefor. The silicon carbide closed-cell ceramic comprises the following components and the mass ratio thereof: an industrial silicon-based waste residue : a reducing agent : an adhesive : a sintering aid : a pore former = 100 : (30-60) : (3-5) : (5-60) : (5-60). The preparation steps include: (1) uniformly mixing materials according to the ratio of the industrial silicon-based waste residue : the reducing agent : the adhesive : the sintering aid : the pore former = 100 : (30-60) : (3-5) : (5-60) : (5-60), and ball-milling same to obtain a blended material; (2) dry-pressing and shaping, and drying the blended material; and (3) placing the dried material into a high-temperature furnace, sintering same in a reducing atmosphere and performing thermal insulation for a certain time to prepare the silicon carbide closed-cell ceramic prepared by using the industrial silicon-based waste residue. The apparent porosity of the ceramic is 30%-55%, the closed porosity of the ceramic is 12%-20%, the normal-temperature compressive strength of the ceramic is 106-140 MPa, the thermal shock resistance of the ceramic is 103-111 times, and the thermal conductivity of the ceramic is 0.40-0.69 w/( m·K).