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Red mud and fly ash-based ceramic foams using starch and manganese dioxide as foaming agent 被引量:11

以淀粉和二氧化锰为发泡剂的赤泥-粉煤灰基泡沫陶瓷(英文)
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摘要 Ceramic foams were prepared using red mud and fly ash as raw materials with sodium borate as sintering aid agent,starchand MnO2as foaming agent,respectively.The influence of the amount of starch or MnO2on the crystalline phase,pore morphologyand physical–chemical porosities was studied.The results showed that the main crystal phases of samples with starch addition andMnO2addition were sodalite phase Na6(AlSiO4)6and Na8(SiAlO4)6MnO4,respectively.The SEM images showed that the variation ofporous structure was mainly dominated by the addition of foaming agent.With the increase of foaming agent,the samples exhibitedbetter comprehensive properties:bulk density of0.59?0.96g/cm3,porosity of41.82%?63.51%,water absorption of3.16%?9.17%,compressive strength of4.22?8.38MPa,flexural strength of2.44?5.82MPa,acid resistance of95.59%?99.60%,alkali resistance of99.82%?99.99%.Based on these properties,the ceramic foams can be used in building field. 分别以淀粉和二氧化锰分别为发泡剂,以硼酸钠为助溶剂,成功制备以赤泥和粉煤灰为主要原料的泡沫陶瓷。研究了淀粉或二氧化锰的含量对泡沫陶瓷中物相、孔形态及理化性能的影响。结果表明,以淀粉或二氧化锰为发泡剂制备的泡沫陶瓷的主晶相分别为Na_6(AlSiO_4)_6和Na_8(SiAlO_4)_6MnO_4;扫描电镜观察结果表明,发泡剂含量对泡沫陶瓷中气孔结构的形成起决定性作用;随着发泡剂含量的增加,泡沫陶瓷表现出优良的综合性能:体密度0.59~0.96 g/cm^3,气孔率41.82%~63.51%,吸水率3.16%~9.17%,抗压强度4.22~8.38 MPa,抗弯强度2.44~5.82MPa,耐酸性95.59%~99.60%和耐碱性99.82%~99.99%。所制备的泡沫陶瓷适合用作建筑物的隔热、保温、隔声与防火材料。
作者 Li-jun HOU Tao-yong LIU An-xian LU 侯丽君;刘涛涌;卢安贤(中南大学材料科学与工程学院,长沙410083)
出处 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第3期591-598,共8页 中国有色金属学报(英文版)
基金 Project(K1003027-11) supported by the Key Project Foundation of Science and Technology Plans of Changsha,China
关键词 red mud fly ash STARCH manganese dioxide ceramic foam 赤泥 粉煤灰 淀粉 二氧化锰 泡沫陶瓷
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