Strong porous permeable ceramic is studied, prepared by selection of grain size compositions with filler of electromelted corundum grades F600 (100 – 200 μm), F360 (40 – 60 μm), and F120 (10 – 20 μm). The strengthening binders used are very fine corundum powder (~2 μm), alloyed with 0.25 wt.% MgO; a mixture of SiC (particle size 3 – 4 μm) and MgO (particle size 1 – 2 μm) in a ratio of 2:1. Specimens in the form of bars 60 × 15 × 5.5 mm are prepared by uniaxial semidry compaction under a pressure of 50 MPa (for single fraction compositions) and 25 MPa (for three-fraction compositions). Specimens are fired in air at temperatures from 1350 to 1550°C. Specimen open porosity varies from 28 to 43%, and ultimate strength in bending from 1 to 36 MPa. The best strength is obtained using a binder in the system SiC–MgO (5 wt.% binder above 100% of filler, σben = 36 MPa, and open porosity is 30%).
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Notes
Subsequently % is written instead of wt.%.
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Translated from Novye Ogneupory, No. 2, pp. 25 – 29, February, 2017.
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Belyakov, A.V., Oo, Z.Y.M., Popova, N.A. et al. Strengthening Binders for Porous Permeable Ceramic with Electromelted Corundum Filler. Refract Ind Ceram 58, 89–93 (2017). https://doi.org/10.1007/s11148-017-0060-9
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DOI: https://doi.org/10.1007/s11148-017-0060-9