The Design of Three-Layered Struts to Strengthen SiC Reticulated Porous Ceramics for Porous Media Combustion
1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 43008/China
2 National-Provincial Joint Engineering, Research Center of High Temperature, Materials and Lining Technology, Wuhan 430081/China
Revision 28.05.2018, 28.09.2018
Volume 11, Issue 1, Pages 77 - 81
Abstract
Silicon Carbide Reticulated Porous Ceramics (SiC RPCs) with multi-layered struts were designed via polymer sponge replica technique together with vacuum infiltration of alumina slurry containing kyanite. The effects of vacuum infiltration and the addition of kyanite in infiltration slurry on the strut structure, mechanical properties and thermal shock resistance of SiC RPCs were investigated. During vacuum infiltration process, the triangular voids within SiC struts were filled up and strut surface was coated by infiltration slurry. After sintering, the multi-layered struts were designed in SiC RPCs, which were characterised as the outer layer of aluminosilicate, middle layer of mullite bonded SiC skeleton and inner layer of mullite-bonded corundum. SiC RPCs with three-layered struts possessed excellent mechanical properties and thermal shock resistance in association with the reaction-boned inner layer and the optimised strut structure.
Keywords
SiC reticulated porous ceramics, three-layered strut, mechanical properties, thermal shock resistance
References
[1] Pickenäcker, O.; et al.: Innovative ceramic materials for porous-medium burners, I. Interceram 48 (1999) 424–433 [2] Abdul Mujeebu, M.; et al.: Applications of porous media combustion technology – A review. Appl. Energy 86 (2009) 1365–1375 [3] Ortona, A.; et al.: Aging of reticulated Si-SiC foams in porous burners. Advances in Appl. Ceramics 109 (2010) 246–251 [4] Ding, S.; Zeng, Y.P.; Jiang, D.L.: Thermal shock resistance of in situ reaction bonded porous silicon carbide ceramics Mater. Sci. & Engin. 425 (2006) 326–329 [5] Brockmeyer, J.W.; Aubrey, L.S.; Dore, J.E.: Ceramic foam flter. US Patent 4975191, 1990 [6] Colombo, P.: Conventional and novel processing methods for cellular ceramics. Philosophical Transactions of the Royal Society. A Mathematical Physical & Engin. Sci. 364 (2006) 109–124 [7] Yao, X.M.; Tan, S.H.; Huang, Z.R.: Infuence of polymeric sponge pre-treatment on properties of reticulated porous ceramics. J. of the Chinese Ceramic Soc. 33 (2005) 1215–1219 [8] Yao, X.M.; et al.: Effect of recoating slurry viscosity on the properties of reticulated porous silicon carbide ceramics. Ceramics Int. 32 (2006) 137–142 [9] Zhu, X.W.; et al.: Improvement in the strut thickness of reticulated porous ceramics. J. of the Amer. Ceram. Soc. 84 (2004) 1654–1656 [10] Hargus, P.M.; Mula, J.A.; Redden, M.K.: Process for forming a ceramic foam. US Patent No. 4 866 011, 12. Sept. 1989 [11] Jun, I.; et al.: Improved compressive strength of reticulated porous zirconia using carbon coated polymeric sponge as novel template. Mater. Letters 60 (2006) 2507–2510 [12] Chen, D.H.; Masuda, K.: Effects of honeycomb geometry on stress concentration due to defects. Composite Structures 188 (2018) 55–63
Copyright
Göller Verlag GmbH
