Multilayer High-Alumina Ceramic Materials for Disperse Systems Microfiltration with Active Layer Received in Al2O3-CuO, Al2O3- TiO2-MnO2 Systems

Abstract

Designed composition of ceramic mass for synthesis of the high-alumina ceramic substrates for production multilayer microfiltration membranes. Electrocorundum (fraction 100–250 microns) was used as filler for producing of the high-alumina substrates, as a binder – kaolinite-hydromica clay and aluminoborosilicate glass and chalk. Formation of material carried by dry pressing at the pressure of 60 MPa, the temperature of synthesis was 1200–1300 °C. The effect of the sintering temperature of the material, the amount and composition of binder on the porosity, mechanical strength, permeability and porous structure of highalumina permeable porous substrate was investigated. The structure of the substrate is represented by an extensive network of slit-shape pore channels, an average equivalent pore diameter – 10–40 μm. The material has the following set of physicochemical properties: mechanical compressive strength is 27.41 MPa, open porosity – 36.49 %, permeability coefficient – 2.07·10-7 m2. The possibility of application of permeable high-alumina porous substrates as macro- and microfiltration elements in the dairy industry was researched. Designed multilayer high-alumina ceramic materials for disperse systems microfiltration with active layer received in Al2O3-CuO, Al2O3-TiO2-MnO2 systems. The average pore diameter of the microfiltration layers is 1–10 μm, the open porosity – 38.90–48.42 %, the permeability coefficient of the multilayer membranes (thickness 6.15–6.25 mm) – (1.566–1.669)·10-7 m2.