Novel porous Si3N4 ceramics prepared by aqueous gelcasting using Si3N4 poly-hollow microspheres as pore-forming agent |
| |
| Affiliation: | 1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300072 China;2. Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin, 300072 China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China;3. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK |
| |
| Abstract: | In this paper, novel porous Si3N4 ceramics were prepared by aqueous gelcasting using Si3N4 poly-hollow microspheres as pore-forming agent. The effect of Si3N4 poly-hollow microsphere content on the phase composition, microstructure, shrinkage, porosity and mechanical properties of the prepared porous Si3N4 ceramics were investigated. It is found that there is only β-Si3N4 phase in all the prepared porous Si3N4 ceramics. Meanwhile, the SEM results show that the pores in the porous Si3N4 ceramics distribute uniformly, the added Si3N4 poly-hollow microspheres and the basal body contact closely. With the increase of Si3N4 poly-hollow microsphere content, the shrinkage of the porous Si3N4 ceramics decreases gradually, and the porosity of the porous Si3N4 ceramics decreases firstly and then increases. Furthermore, the flexural strength and fracture toughness of the porous Si3N4 ceramics decrease with the increase of the Si3N4 poly-hollow microsphere content. |
| |
| Keywords: | Aqueous gelcasting Flexural strength Fracture toughness |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
