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Reticulated Porous Multiphase Ceramics with Improved Compressive Strength and Fracture Toughness |
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| Authors: | Shou-ren Wang Hao-ran Geng Lin-hai Hui Ying-zi Wang |
| Affiliation: | (1) School of Mechanical Engineering, Ji’nan University, Jinan, 250022, P.R. China;(2) The Key Laboratory of Liquid Structure and Heredity of Materials of Shandong University, 250014 Ji’nan, P.R. China;(3) School of Material Science, Ji’nan University, 250022 Ji’nan, P.R. China |
| Abstract: | A multiphase reticulated porous ceramic (RPC) as Si3N4–Al2O3–SiO2 was fabricated by replication techniques. Proper volumes of additives and twice sinter- twice immerse process endow the RPC an excellent crack healing and submerging property. The compressive strength and fracture toughness improved owing to the crack bridging behavior. The existence of pores in struts in RPC blunt the crack tip and increased the external force needed to propagate the crack. The mechanisms play a beneficial role in enhancing the compressive strength and fracture strength. Si3N4 RPC with additives of 5%Al and 5% Al2O3 yielded the compressive strength of 9.8 MPa and fracture toughness of 0.3 MPa m1/2. |
| Keywords: | compressive strength crack bridging crack healing crack tip blunting fracture toughness reticulated porous ceramic |
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