含堇青石涂层碳化硅网状多孔陶瓷的制备及燃烧特性  

Preparation and Combustion Characteristics of Cordierite Coated SiC Reticulated Porous Ceramics

作　　者：万方豪 李亚伟[1,2] 梁雄[1,2] 潘丽萍[1,2] 王庆虎[1,2] 桑绍柏[1,2] 邹阳[1,2] 李晨辉[3] WAN Fanghao;LI Yawei;LIANG Xiong;PAN Liping;WANG Qinghu;SANG Shaobai;ZOU Yang;LI Chenhui(Wuhan University of Science and Technology,The State Key Laboratory of Refractories and Metallurgy,Wuhan 430081,China;Wuhan University of Science and Technology,National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology,Wuhan 430081,China;State Key Laboratory of Material Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]武汉科技大学,省部共建耐火材料与冶金国家重点实验室,武汉430081 [2]武汉科技大学,高温材料与炉衬技术国家地方联合工程研究中心,武汉430081 [3]华中科技大学材料科学与工程学院,材料成形及模具技术国家重点试验室,武汉430074

出　　处：《硅酸盐学报》2022年第6期1685-1693,共9页Journal of The Chinese Ceramic Society

基　　金：湖北省自然科学基金(2020CFB122);国家自然科学基金(52102028)。

摘　　要：针对多孔介质高温燃烧用碳化硅多孔陶瓷因高温氧化导致抗热震性能以及辐射效率衰减等问题,首先采用有机泡沫浸渍法制备碳化硅素坯,经低温预烧、真空浸渍含Mg(OH)_(2)、单质Si和α-Al_(2)O_(3)浆料,经过原位反应烧结在碳化硅骨架表面构筑含堇青石红外辐射涂层的碳化硅多孔陶瓷。结果表明:真空浸渍浆料能在碳化硅骨架表面涂覆连续涂层的同时,能完全填充骨架的三角孔洞,经1350℃烧结成功制备了具有堇青石涂层、碳化硅骨架中间层、堇青石填充层的3层结构碳化硅多孔陶瓷。3层结构的形成显著提高了碳化硅多孔陶瓷力学性能及抗热震性能以及高温抗湿氧化能力,碳化硅多孔陶瓷在1350℃热处理后耐压强度达到1.18 MPa、残余强度保持率达67%;碳化硅多孔陶瓷中3层结构孔筋表面堇青石红外辐射涂层的形成,强化了碳化硅多孔介质燃烧器辐射换热过程和燃烧效率,将燃烧器表面温度提高约140℃,并显著降低了燃烧器中CO、NOx等污染物的排放量。To solve the problems of thermal shock resistance and radiation efficiency attenuation due to the high-temperature oxidation of silicon carbide porous ceramics used in high-temperature combustion of porous media,a silicon carbide billet was prepared by an organic foam impregnation method.Also,porous silicon carbide ceramics containing cordierite infrared radiation coating were fabricated on the surface of silicon carbide skeleton via in-situ reaction sintering.The results show that the vacuum impregnation slurry can coat the skeleton surface and completely fill up the triangular holes of the silicon carbide skeleton.The three-layered porous silicon carbide ceramics with a cordierite coating,the central layer of the silicon carbide skeleton and the cordierite filling layer were prepared by sintering at 1350℃.The mechanical properties,thermal shock resistance and high-temperature wet oxidation resistance of porous silicon carbide ceramics are improved due to the formation of the three-layered structure.The compressive strength of porous silicon carbide ceramics is 1.18 MPa after heat-treatment at 1350℃,and the residual strength retention rate is 67%.According to the results of porous media combustion experiments,the three-layered structure of silicon carbide porous ceramic with a surface reinforcement by cordierite infrared radiation coating can reinforce silicon carbide porous media burner radiation heat transfer process and increase the combustion efficiency,thus increasing the burner surface temperature by 140℃and reducing the emissions of CO and NO_(x) pollutants in the burner.

关 键 词：碳化硅多孔陶瓷 堇青石 涂层 3层结构 抗热震 

分 类 号：TQ175[化学工程—硅酸盐工业]