莫来石-刚玉-镁铝尖晶石复相材料的抗碱侵蚀性能研究  

Preparation and alkali corrosion resistance of mullite-corundum-magnesium aluminate spinel multiphase materials

作　　者：高云琴[1,2] 郭凯歌 马爱琼 牛兴荣[1] 杨光 张旭东[1] Gao Yunqin;Guo Kaige;Ma Aiqiong;Niu Xingrong;Yang Guang;Zhang Xudong(College of Materials Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,Shaanxi,China;不详)

机构地区：[1]西安建筑科技大学材料科学与工程学院,陕西西安710055 [2]矿区生态修复与固废资源化厅市共建山西省重点实验室培育基地,山西阳泉045000

出　　处：《耐火材料》2024年第4期334-340,共7页Refractories

基　　金：矿区生态修复与固废资源化厅市共建山西省重点实验室培育基地开放基金(SXIT202305)资助。

摘　　要：为了提高莫来石-刚玉质匣钵的抗碱侵蚀性能,以煤矸石、工业氧化铝和工业氧化镁为原料,采用二步煅烧法制备了莫来石-刚玉-镁铝尖晶石复相材料,研究了工业氧化镁加入量(加入质量分数分别为1%、2%、3%、4%和5%)对试样物相组成、显微结构及物理性能的影响,并探究了试样抗钠离子电池正极材料的侵蚀机制。结果表明:1)氧化镁可促进莫来石晶体生长和试样烧结致密化,且由于莫来石晶体直接结合及微晶镁铝尖晶石颗粒增韧,所有试样均具有高的常温耐压强度,≥248 MPa;2)以不同形态分布于试样中的镁铝尖晶石可形成物理屏障,阻止Na^(+)渗透,阻隔其与莫来石和刚玉反应,提高试样的抗碱侵蚀性能;3)综合试样的物理性能和抗碱侵蚀性能,工业氧化镁的最佳加入量为4%(w)。To improve the alkali corrosion resistance of mullite-corundum saggars,mullite-corundum-magnesium aluminate spinel multiphase materials were prepared using coal gangue,industrial alumina,and industrial magnesia as raw materials via a two-step calcination method.Effects of the industrial magnesia addition(1%,2%,3%,4%,and 5%,by mass)on the phase composition,microstructure,and physical properties of the samples were studied.The corrosion resistance mechanism of the samples to sodium ion battery cathode materials was explored.The results show that:(1)MgO can promote the growth of mullite crystals and the sintering densification of the samples;due to the direct bonding of mullite crystals and the toughening of microcrystalline magnesium aluminate spinel particles,all samples have high cold compressive strength,≥248 MPa;(2)the MgAl_(2)O_(4)spinel distributed in different forms in the samples can form physical barriers to prevent Na^(+)penetration,block its reaction with mullite and corundum,and improve the alkali corrosion resistance of the samples;(3)considering the physical properties and the alkali corrosion resistance of the samples,the optimum addition of the industrial magnesia is 4%.

关 键 词：莫来石-刚玉-镁铝尖晶石 物相组成 显微结构 抗碱侵蚀性能 

分 类 号：TQ174[化学工程—陶瓷工业]