Si3N4泡沫陶瓷的制备过程影响因素及复合化研究进展

Research Progress of Influencing Factors of Preparation Process and Composite of Si3N4 Foamed Ceramics

Si3N4泡沫陶瓷具有低密度、低热导率、优异高温稳定性等特点,在隔热、高温催化剂载体等诸多领域有着极大的应用潜力。近年来,学术界深入研究了Si3N4泡沫陶瓷的制备工艺优化对其组成成分,孔隙率、孔径分布和孔径大小等结构参数,以及力学性能、热导率和介电常数等性能的影响。本文全面分析了陶瓷粉体的类别和粒径、烧结助剂的组成和含量、固相含量、烧结升温速率以及保温时间等工艺参数对Si3N4泡沫陶瓷的微观结构及各项性能的影响规律,为新型Si3N4泡沫陶瓷的设计提供借鉴与指导。介绍了Si3N4泡沫陶瓷与气凝胶、树脂、金属等材料复合化实现互补效应的最新研究进展,并对相关研究领域的前景进行了展望。

Si3N4 foam ceramics have great application potential in many fields such as heat insulation and high temperature catalyst carrier due to their low density,low thermal conductivity and excellent high temperature stability.In recent years,the academic community has intensively stu-died the effects of the preparation process of Si 3N 4 foam ceramics on their composition,porosity,pore size distribution and pore size,as well as mechanical properties,thermal conductivity and dielectric constant.In this paper,the influences of the type and particle size of ceramic powder,the composition and content of sintering aid,solid phase content,sintering heating rate and holding time on the microstructure and properties of Si 3N 4 foam ceramics are analyzed.And the paper can provide reference and guidance for the design of the new type Si 3N 4 foam ceramics.The latest research progress of the composite of Si 3N 4 foam ceramics with aerogel,resin,metal and other materials is introduced which has the advantage of complementary effect,and the prospects of related research fields are prospected.