Abstract
In this paper, novel Al2O3-based poly-hollow microsphere (PHM) ceramics were prepared using Si3N4 and Al2O3 PHMs as pore-forming agents. The effect of Si3N4 and Al2O3 PHMs with different percentages on properties of Al2O3-based PHM ceramics was investigated. Through adjusting percentage of Al2O3 PHMs, Al2O3-based PHM ceramics with enhanced properties are achieved. X-ray diffraction (XRD) results show that main phases of Al2O3-based PHM ceramics vary from β-SiAlON (z value increases from 2.9 to 4) to Al2O3 with the increase of percentage of Al2O3 PHMs from 10% to 100%. The different phase compositions result in different properties of Al2O3-based PHM ceramics. With the increase of percentage of Al2O3 PHMs, porosity of Al2O3-based PHM ceramics gradually decreases, while their shrinkage, flexural strength, and fracture toughness firstly decrease and then increase. Using different kinds of ceramic PHMs as pore-forming agents, various novel and high-performance porous ceramics could be prepared via optimizing percentage of ceramic PHMs in the future.
Highlights
Porous ceramics with high porosity, high specific surface area, low density, low thermal conductivity, and other unique properties have attracted much attention for their potential applications as catalyst supports, filters, thermal insulator, and bone substitutes, etc. [1,2,3,4]
Novel Al2O3-based poly-hollow microsphere (PHM) ceramics were successfully prepared by aqueous gelcasting using Si3N4 and Al2O3 PHMs as pore-forming agents
When percentage of Al2O3 PHMs increases from 10% to 100%, main phases of the samples gradually vary from β-SiAlON (z value increases from 2.9 to 4) to Al2O3
Summary
Porous ceramics with high porosity, high specific surface area, low density, low thermal conductivity, and other unique properties have attracted much attention for their potential applications as catalyst supports, filters, thermal insulator, and bone substitutes, etc. [1,2,3,4]. Lots of processing routes have been used to prepare porous ceramics, such. J Adv Ceram 2016, 5(2): 176–182 successfully produced via combination of particlestabilized foams and centrifugal atomizing technology [19,20], which could be used as novel promising pore-forming agent to prepare porous ceramics. In 2014, Su et al [19] prepared porous Al2O3 ceramics by gelcasting using Al2O3 PHMs as pore-forming agent. When lots of Al2O3 PHMs are used to prepare porous ceramics, they would contact with each other. In order to improve the bonding strength among different Al2O3 PHMs, Yang et al [21] coated Al2O3 PHMs with CaSiO3 sintering additive via co-precipitation method, and porous Al2O3 ceramics with good mechanical properties were successfully prepared by dry pressing using coated
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