MgAl1.9Ga0.1O4透明陶瓷具有优异的光学性能,其制备依赖于高质量坯体的凝胶注模成型和长时间的无压预烧.本研究选择MgF2为烧结助剂,并通过瞬时液相调节无压预烧的致密化过程.采用干压成型、无压预烧和热等静压烧结制备了不同尺寸的MgAl1.9Ga0.1O4透明陶瓷样品,并系统分析了 MgF2对材料显微结构、光学和机械性能的影响.研究表明:MgF2在～1230 ℃熔化形成的液相促使陶瓷的致密度与晶粒尺寸增大,后续烧结过程中残留的MgF2氧化为MgO并固溶进入MgAl1.9Ga0.1O4晶格.添加质量分数0.2％MgF2的2.04 mm厚透明陶瓷样品在紫外和可见光区域具有76.5％～83.4％的直线透过率和较高的光学质量.此外,该陶瓷的特征抗弯强度为167.1 MPa,与细晶MgAl2O4透明陶瓷相近,但是前者的Weibull模数(8.81±0.29)更高.本研究为制备光学性能良好的大尺寸MgAl1.9Ga0.1O4透明陶瓷提供了新的选择.
Currently,the preparation of MgAl1.9Ga0.1O4 transparent ceramics which possess excellent optical properties,is still relying on combining aqueous gel-casting and prolonged pressureless pre-sintering.In this work,MgF2 was used as a sintering additive,and densification process of pressureless pre-sintering was adjusted by a transient liquid phase.MgAl1.9Ga0.1O4 transparent ceramics with different sizes were prepared by dry pressing,pressureless pre-sintering,and hot isostatic pressing treatment.The effects of MgF2 additive on microstructure,optical,and mechanical properties of the samples were systematically analyzed.The results indicated that MgF2 melted at～1230 ℃,contributing to increase of density and grain size of the pre-sintered body,while the residual MgF2 was oxidized to MgO and dissolved into the MgAl1.9Ga0.1O4 lattice in the subsequent sintering process.The 2.04 mm thick transparent ceramic sample with 0.20％(in mass fraction)MgF2 has an in-line transmittance of 76.5％-83.4％in the UV and visible regions.Moreover,the sample has high optical quality with low scattering on incident light.In addition,the characteristic flexural strength of this ceramics is 167.1 MPa,which is close to that of the fine-grained MgAl2O4 transparent ceramics,but the Weibull modulus(8.81±0.29)is higher.This study provided a new option for the preparation of large MgAl1.9Ga0.1O4 transparent ceramic materials with good optical properties.
吕朝阳;徐勇;杨久延;涂广升;涂兵田;王皓
武汉理工大学材料复合新技术国家重点实验室,武汉 430070||武汉理工大学襄阳示范区湖北隆中实验室,襄阳 441000
化学工程
透明陶瓷;MgAl1.9Ga0.1O4;MgF2;瞬时液相烧结;光学性能
transparent ceramic;MgAl1.9Ga0.1O4;MgF2;transient liquid phase sintering;optical property
《无机材料学报》 2024 (005)
531-538 / 8
国家重点研发计划(2023YFB3812000);国家自然科学基金(52272072);湖北隆中实验室自主创新研究项目(2022ZZ-13)National Key Research and Development Program of China(2023YFB3812000);National Natural Science Foundation of China(52272072);Hubei Longzhong Laboratory Independent Innovation Research Project(2022ZZ-13)
10.15541/jim20230587
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