Abstract
The porous cordierite-mullite ceramics were prepared by the pore-forming in-situ technique. The characterizations of porous cordierite-mullite ceramics were determined by an X-ray diffractometer (XRD), a scanning electron microscopy (SEM), and a microscopy measured method, etc., and the effect of particle size on phase composition, pore characterization and strength were investigated. It?s found that particle size affects strongly the formations of cordierite and mullite, and then changes the pore characterization and strength. With the decrease of the particle size, the sintering temperature at which the formations of cordierite and mullite take place extremely fast decreases, the pore size distribution becomes from bi-peak mode to mono-peak mode, the porosity and the median pore size decrease but strength increases. The most opposite mode is the specimen sintered at 1400 ?C from the grinded powder with an average particle size of 10.2 ?m, which consists of cordierite, mullite and minor spinel, and has a high apparent porosity (40 %), a high compressive strength (58.4 MPa), a small median pore size (6.3 ?m) and well-developed necks between particles.
Highlights
With the increasing demand of saving energy and resource, porous ceramics with excellent properties and their environment-friendly fabrication methods have attracted extensive attentions
When the average particle size is 25.6 μm, the phase composition of specimen A sintered at 1370°C are cordierite, mullite, spinel, corundum (Al2O3) and quartz (SiO2), with the increase of sintering temperature to 1400°C, quartz in specimen A disappears
When the average particle size decreases to 17.6 μm, the phases of specimen B sintered at 1370°C are cordierite, mullite, spinel, corundum, no quartz, with the increase of sintering temperature to 1400°C, the phases of specimen B are cordierite, mullite, spinel
Summary
With the increasing demand of saving energy and resource, porous ceramics with excellent properties and their environment-friendly fabrication methods have attracted extensive attentions. The properties of porous ceramics greatly depend on the porosity, the pore size distribution and the compositions. Smaller pore size and homogenous pore distribution are thought to be helpful to improve the strength of porous ceramics and decrease the coefficient of thermal conductivity [1,2,3,4,5,6,7]. The compositions of porous ceramics with lower coefficient of thermal expansion and higher strength are propitious to enhance the high-temperature properties. The pore-forming in-situ technique is a good and environment friendly way to prepare porous ceramics with well-distributed pores because it
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
