Fe_(2)O_(3)对Ca_(2)Mg_(2)Al_(28)O_(46)相组成与组构及其致密化进程的影响  

Effect of Fe_(2)O_(3)Addition on Phase Composition and Fabric and Densification Evolution of Ca_(2)Mg_(2)Al_(28)O_(46)

作　　者：刘云 尹洪峰[1] 汤云 辛亚楼 任小虎 袁蝴蝶[1] 孙可为[1] LIU Yun;YIN Hongfeng;TANG Yun;XIN Yalou;REN Xiaohu;YUAN Hudie;SUN Kewei(College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《硅酸盐学报》2023年第6期1499-1509,共11页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51572213)。

摘　　要：Ca_(2)Mg_(2)Al_(28)O_(46)(C_(2)M_(2)A_(14))耐火材料具有优异的高温使用性能,为了将这类耐火材料应用在高温窑炉,本工作采用高温固相反应烧结法合成了三元化合物C_(2)M_(2)A_(14),研究了烧成温度及添加1%(质量分数)Fe_(2)O_(3)对试样相组成演变与组构及其致密化进程的影响。结果表明:C2M2A14在1650℃由六铝酸钙(CA6)与尖晶石反应生成,在1750℃大量生成,随着六方板状CA6转化为多面体C2M2A14和低共熔液相的出现,致密化进程加快。加入Fe_(2)O_(3)后,由原来(1,1,15)晶面择优取向的六方板状晶体转变为(119)晶面择优取向的菱面体,同时由于Fe离子的固溶活化作用,促进了致密化进程,相同烧成温度可获得更加致密的合成产物,经1780℃保温3 h烧成制备的C2M2A14试样显气孔率为12.5%、吸水率为3.9%、体积密度为3.20 g·cm^(-3),获得了一种高温耐火材料。Ca_(2)Mg_(2)Al_(28)O_(46)(C_(2)M_(2)A_(14))refractory has a superior high-temperature performance for high-temperature kilns.In this paper,a ternary compounds-C2M2Ai4 was synthesized via high-temperature solid-state reaction sintering.Effects of firing temperature and Fe_(2)O_(3)addition on the phase composition,fabric and densification evolution of the specimens were investigated.The results show that the C_(2)M_(2)A_(14)is generated by the reaction of CaA_(12)O_(19)(CA6)with spinel at 1650 C,and is produced in large quantities at 1750 C.The densification evolution is accelerated with the transformation from hexagonal lamellar CA to polyhedron C_(2)M_(2)A_(14)and the appearance of eutectic liquid.The hexagonal plate of(1,1,15)preferred orientation is changed to the rhombohedral of(119)preferred orientation after adding Fe2O3,and the densification evolution is promoted,and more dense synthetic products can be obtained at the same firing temperature due to the solid solution strengthening of Fe ions.The apparent porosity,water absorption,and bulk density of C_(2)M_(2)A_(14)(1%Fe203)specimen fired at 1780℃for 3 h are 12.5%,3.9%,and 3.20 gcm-3,respectively.A high-temperature refractory is obtained.

关 键 词：钙镁铝氧化物 相组成演变 组构 致密化进程 

分 类 号：TU528[建筑科学—建筑技术科学]