首页|轻烧MgO粉对凝胶注模法制备MgAl2O4多孔陶瓷性能的影响

轻烧MgO粉对凝胶注模法制备MgAl2O4多孔陶瓷性能的影响

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为了降低原料成本,简化工艺流程,提高MgAl2O4多孔陶瓷的性能,将Al2O3粉和MgO粉于1 500 ℃保温2 h合成了 MgAl2O4粉体,再外加轻烧MgO粉(外加质量分数分别为0.5%、1.0%、1.5%和2.0%),采用凝胶注模法于1 500℃保温2 h制备了 MgAl2O4多孔陶瓷,研究轻烧MgO粉外加量对MgAl2O4多孔陶瓷结构和性能的影响.结果表明:1)以轻烧MgO粉作为固化剂制备的MgAl2O4多孔陶瓷烧后线收缩率较小,具有较好的尺寸稳定性,且孔径主要分布在0.5~2.0 μm;2)随着轻烧MgO粉外加量的增加,MgAl2O4多孔陶瓷的显气孔率和气通量增加,显微结构较均匀;3)当轻烧MgO粉外加量(w)为2.0%时,MgAl2O4多孔陶瓷的综合性能最佳.
Effect of light burnt MgO powder on properties of porous MgAl2O4 ceramics by gel-casting route
In order to reduce the raw materials cost,simplify the process,and improve the performance of porous MgAl2O4 ceramics,MgAl2O4 powders were synthesized using Al2O3 powder and MgO powder at 1 500 ℃ for 2 h,and then light burnt MgO powders(0.5%,1.0%,1.5%and 2.0%,by mass)were extrally added to prepare porous MgAl2O4 ceramics using the gel-casting route at 1 500 ℃ for 2 h.Effect of the light burnt MgO powder addition on the structure and performance of porous MgAl2O4 ceramics were in-vestigated.The results show that:(1)the porous MgAl2O4 ceramics prepared using light burnt MgO pow-der as a hardener have small linear shrinkage and good volume stability,whose pore size is mainly in the range of 0.5-2.0 μm;(2)as the light burnt MgO powder addition increases,the apparent porosity and the gas flux increase,and the microstructure is uniform;(3)when the light burnt MgO powder addition is 2.0%,porous MgAl2O4 ceramics show the optimal comprehensive performance.

porous MgAl2O4 ceramicsgel-casting routelight burnt MgO powdermicrostructure

朴佳思、杜庆洋、唐钰栋、白佳海

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山东理工大学材料科学与工程学院 山东淄博 255049

山东工业陶瓷研究设计院有限公司 山东淄博 255049

MgAl2O4多孔陶瓷 凝胶注模法 轻烧MgO粉 显微结构

山东省自然科学基金资助项目

ZR2019MEM045

2024

耐火材料
中钢集团洛阳耐火材料研究院有限公司

耐火材料

北大核心
影响因子:0.808
ISSN:1001-1935
年,卷(期):2024.58(1)
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