Varying the Granulometric Composition of an Electrofused-Corundum-Based Ceramic with a Porcelain Binder to Control its Open Porosity and Strength

• Published in: Refractories and industrial ceramics Vol. 57; no. 1; pp. 77 - 80
• Main Authors: Belyakov, A. V., Oo, Zaw Ye Maw, Popova, N. A., Min, Ye Aung, Oo, Kyaw Lwin
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.05.2016; Springer Nature B.V
• Subjects: Binders; Ceramics; Ceramics industry; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Corundum; Flexural strength; Glass; Materials Science; Mixes; Modulus of rupture in bending; Natural Materials; Particle size; Porcelain; Porosity; Sintering (powder metallurgy); ceramic; granular powders; electrofused corundum; strength; open porosity; ceramic filters
• DOI: 10.1007/s11148-016-9931-8
• ISSN: 1083-4877

A study is made of a strong porous ceramic based on granular mixes of a filler—electrofused corundum with particle sizes of 2 – 3 and 0.5 mm (95 wt.% of the mix) — and a porcelain binder (5 wt.%). Several mixes were prepared with different values for the 2 – 3 mm/0.5 mm ratio of filler-particle sizes: 0/95, 35/60, 40/55, 45/50, 50/45, and 95/0. The specimens were pressed at pressures of 25, 50 and 100 MPa and fired at temperatures of 1350 and 1450°C. The sintered specimens ranged from 19 to 143 MPa in ultimate flexural strength and 17 to 26% in open porosity. The results are attributed to the formation of a framework in the semifinished product along with regions outside the framework. The new porous permeable ceramic is promising for use in the form of filters and supports for ceramic membranes.