氧化镁、碳酸钙矿化剂对多孔氧化铝陶瓷性能的影响  

Effects of magnesium oxide and calcium carbonate mineralizers on the performance of porous alumina ceramic

作　　者：陈广[1,3] 王威 梁力行 彭勇慧 周文韬 欧阳静 王志国[2] CHEN Guang;WANG Wei;LIANG Lixing;PENG Yonghui;ZHOU Wentao;OUYANG Jing;WANG Zhiguo(Hunan Key Laboratory of Mineral Materials and Application,Central South University,Changsha 410083,China;Technology Center,China Tobacco Hunan Industrial Co.,Ltd.,Changsha 410007,China;Department of Inorganic Materials,School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学矿物材料及其应用湖南省重点实验室,长沙410083 [2]湖南中烟工业技术有限公司技术中心,长沙410007 [3]中南大学资源加工与生物工程学院无机材料系,长沙410083

出　　处：《粉末冶金材料科学与工程》2023年第4期347-360,共14页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51774331);长沙市自然科学基金资助项目(kq2208271);湖南中烟工业技术有限责任公司开放课题(KY2021KF0011)。

摘　　要：选用TiO_(2)、MgO、CaCO_(3)作为矿化剂,在空气气氛下采用常压烧结工艺制备多孔氧化铝陶瓷。研究MgO、CaCO_(3)含量以及保温时间对氧化铝陶瓷室温抗弯强度、烧结收缩率、显气孔率、密度和溶解效率的影响。结果表明:添加MgO、CaCO_(3)矿化剂均能降低陶瓷的收缩率、室温抗弯强度和密度,提高显气孔率和溶解效率。含有MgO的样品在1320℃/3 h烧结后的收缩率从1.75%降至0.21%,显气孔率由33.49%升至36.86%;在1320℃/6 h烧结后的收缩率从1.88%降至0.38%,显气孔率从32.94%升至35.46%。含有CaCO_(3)的样品在1320℃/3 h烧结后的收缩率从0.55%降至−0.50%,显气孔率由35.47%升至41.26%;在1320℃/6 h烧结后的收缩率从1.16%降至−0.21%,显气孔率从35.96%升至42.44%。终烧保温时间由3 h延长至6 h,含有MgO、CaCO_(3)矿化剂的样品收缩率提高,室温抗弯强度变化不明显,含有MgO的样品显气孔率降低,含有CaCO_(3)的样品显气孔率提高。MgO、CaCO_(3)能明显提高陶瓷样品的溶解效率,仅含有TiO_(2)矿化剂的样品碱煮(加助溶剂LiF)72 h后质量几乎未变;含有MgO矿化剂的样品碱煮(未加助溶剂)24 h均能完全溶解;含有CaCO_(3)矿化剂的样品碱煮(加助溶剂)72 h后完全溶解。TiO_(2),MgO and CaCO_(3) were selected as mineralizing agents for porous alumina ceramics,which were prepared by atmospheric sintering under air atmosphere.The effects of different contents of MgO,CaCO_(3) and holding time on the bending strength at room temperature,sintering shrinkage rate,apparent porosity and dissolving efficiency were studied.The results show that the addition of mineralizing agents MgO and CaCO_(3) can decrease the shrinkage rate,bending strength at room temperature and density,and increase the apparent porosity and the dissolving efficiency.The shrinkage rate of the samples containing MgO decreases from 1.75%to 0.21%after 1320℃/3 h sintering,and the apparent porosity increases from 33.49%to 36.86%.The shrinkage of the samples containing MaO decreases from 1.88%to 0.38%after 1320℃/6 h sintering,and the apparent porosity increases from 32.94%to 35.46%.The shrinkage rate of the samples containing CaCO_(3) decreases from 0.55%to−0.50%after 1320℃/3 h sintering,and the porosity increases from 35.47%to 41.26%.The shrinkage of the samples containing CaCo3 decreases from 1.16%to−0.21%after 1320℃/6 h sintering,and the apparent porosity increases from 35.96%to 42.44%.When the holding time of heating treatment is extended from 3 h to 6 h,the shrinkage rate of the samples containing mineralizing agent MgO and CaCO_(3) increases,while the bending strength at room temperature do not change significantly.The apparent porosity of the samples containing MgO decreases and that of the sample containing CaCO_(3) increases.MgO and CaCO_(3) can significantly improve the dissolving efficiency.The quality of the samples containing only mineralizing agent TiO_(2) is almost unchanged after 72 h of boiling in alkaline liquid(adding cosolvent LiF),the samples containing MgO can be completely dissolved after 24 h of boiling in alkaline liquid(no cosolvent added),and the samples containing CaCO_(3) can be completely dissolved after 72 h of boiling in alkaline liquid(adding cosolvent).

关 键 词：多孔氧化铝陶瓷 矿化剂 收缩率 溶解效率 抗弯强度 

分 类 号：TQ174[化学工程—陶瓷工业]