轻质高强堇青石多孔陶瓷的制备与表征  

Preparation and Characterization of Porous Cordierite Ceramics with Lightweight and High Strength

作　　者：李昊 李翠伟[1] 汪长安[2] LI Hao;LI Cuiwei;WANG Chang’an(School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China;School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044 [2]清华大学材料学院,北京100084

出　　处：《陶瓷学报》2021年第4期632-638,共7页Journal of Ceramics

基　　金：新型陶瓷与精细工艺国家重点实验室(KFZD201902);北京市自然科学基金(2182059)。

摘　　要：以碱式碳酸镁、氧化铝和二氧化硅为原料,采用泡沫注凝法制备了一系列多孔堇青石。结合TG-DTA、XRD及SEM探究了多孔堇青石煅烧过程的反应机理。结果表明,碱式碳酸镁在煅烧过程中分解产生的氧化镁与氧化铝反应生成镁铝尖晶石,石英发生晶型转变生成方石英,最终堇青石由镁铝尖晶石与方石英反应生成。当浆料固含量为20 vol.%、煅烧温度为1455℃时,所制多孔堇青石的总气孔率为86%、抗压强度达到2.55 MPa,实现了多孔堇青石高气孔率与高强度的良好匹配。Basic magnesium carbonate,alumina and silica were used as raw materials to in-situ synthesize porous cordierite ceramics by using foam gelcasting method.The formation mechanism of cordierite during sintering was explored by using TG-DTA,XRD and SEM.It was demonstrated that magnesia produced due to the decomposition of the basic magnesium carbonate reacted with alumina to form magnesia aluminum spinel.Quartz transformed to cristobalite and finally cordierite was formed through the reaction of magnesia-aluminum spinel and cristobalite.Porous cordierite ceramics with different properties could be obtained by adjusting the processing parameters.When the solid content was 20 vol.%and the sintering temperature was 1455℃,the sample exhibited an total porosity of 86%and a compressive strength of 2.55 MPa,achieving a high match degree between high porosity and high strength.This achievement offered a useful guidance for the preparation and application of lightweight high-strength porous ceramics.

关 键 词：堇青石 多孔陶瓷 抗压强度 反应机理 

分 类 号：TQ174.75[化学工程—陶瓷工业]