碳化硅质泡沫陶瓷过滤器的研制.pdfVIP

维普资讯 学兔兔 铸 造 Mar．2008 FOUNDRY Vo1．57 No．3 碳化硅质泡沫陶瓷过滤器的研制 曹大力 ，麦开华 ，马 雷 ，何铃铃 ，孙绍波z (1_沈阳化工学院材料学院，辽宁沈阳110142；2．沈阳机床股份有限公司中捷摇臂钻床事业部，辽宁沈阳110043) 摘要：以碳化硅、高岭土、氧化铝粉为原料，以混合稀土氧化物为烧结助剂，制成流变性较好的水基陶瓷料浆，将其 浸渍在泡沫塑料上，在泡沫体上形成均匀的涂层，最终烧制成具有气孔率高、容重小、强度好、抗热震性强的碳化硅 质泡沫陶瓷过滤器。研究了水、乙醇、NaOH、CMC以及NaOH+CMC对聚氨酯泡沫塑料的表面处理效果。研究发现： 经过NaOH和CMC混合处理的泡沫塑料可以获得最佳的挂浆效果；浆料的涂挂量在一定范围内随着固相含量的增加而 变好，当固相含量为75％时，可获得均匀稳定适于浸渍的浆料；二次挂浆可以明显地增加泡沫塑料的涂覆量，其孔筋 直径是一次挂浆的2倍，增加了泡沫陶瓷过滤器的强度。 关键词：碳化硅；泡沫陶瓷过滤器；混合稀土氧化物；抗折强度 中图分类号：TH249．9 文献标识码：A 文章编号：1001—4977(2008)03—0294—04 Study on Preparation of SiC Based Foam Ceram ic Filters CAO Da-li’，MAI Kai—hua’，MA Lei’，HE Ling-ling’，SUN Shao-bo (1．School of Materials Science and Engineering，Shenyang Institute of Chemical Technology Shenyang 1 1 01 42，Liaoning，China；2．Department of China—Czech Radial Drilling Machine． Shenyang Machine Tool Co．，Ltd．Shenyang 1 1 0043，Liaoning，China) Abstract：SiC based foam ceramic filters with high porosity，light bulk density．high flexural strength and high thermal—shock resistarice were fabricated frOm aqueous slurry by a replication process with polyurethane sponges as the substrates．The ceramic slurry with high viscosity and rheology behavior was prepared with SiC，kaolin，alumina，RE2O3 and other powder additives．The effects of H20，C2H5OH，NaOH，CMC，NaOH+CMC on loading properties of polyurethane sponge were investigated in detail；the results showed that the sponge treated by NaOH+CMC can get satisfying