Preparation and properties of mullite-bonded porous fibrous mullite ceramics by an epoxy resin gel-casting process |
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| Affiliation: | 1. School of Metallurgy, Northeastern University, Shenyang 110819, PR China;2. Electron Microscope Unit, Mark Wainwright Analytical Centre, The University of New South Wales, Sydney, NSW 2032, Australia;1. Department of Chemistry, Indian Institute of Space Science and Technology, Thiruvananthapuram 695 547, India;2. Vikram Sarabhai Space Center, Thiruvananthapuram 695 547, India;1. School of Civil Engineering, Beijing Jiaotong University, 100044, Beijing, China;2. Institute for Infrastructure Engineering, Western Sydney University, Penrith, NSW 2751, Australia;3. Institute of Advanced Structure Technology, Beijing Institute of Technology, 100081, Beijing, China |
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| Abstract: | Porous fibrous mullite ceramics with a narrow range of pore size distribution have been successfully prepared utilizing a near net-shape epoxy resin gel-casting process by using mullite fibers, Al2O3 and SiC as raw materials. The effects of sintering temperatures, different amounts of fibers and Y2O3 additive on the phase compositions, linear shrinkage, apparent porosity, bulk density, microstructure, compressive strength and thermal conductivity were investigated. The results indicated that mullite-bonded among fibers were formed in the porous fibrous mullite ceramics with a bird nest pore structure. After determining the sintering temperatures and the amount of fibers, the tailored porous fibrous mullite ceramics had a low linear shrinkage (1.36–3.08%), a high apparent porosity (61.1–71.7%), a relatively high compressive strength (4.4–7.6 MPa), a low thermal conductivity (0.378–0.467 W/m K) and a narrow range of pore size distribution (around 5 µm). The excellent properties will enable the porous ceramics as a promising candidate for the applications of hot gas filters, thermal insulation materials at high temperatures. |
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| Keywords: | D Mullite B Porosity B Fibers Properties |
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