Abstract
ABSTRACT Porous alumina bodies are expected to find application as refractory materials to reduce energy consumption during the manufacture of inorganic products. The porosity of such bodies can be efficiently increased by using alumina platelets to form a so-called “house-of-cards” structure. This technique was employed in the present study, together with a gelatin-sol (as binder) and freeze-drying. The porosity, compressive strength, and thermal conductivity of a porous alumina body made in this manner and heat-treated at 1600°C were 80.2%, 1.7 MPa, and 0.94 W/m−1∙K−1, respectively. These physicochemical properties would allow this alumina to be used as a thermal insulation refractory clinker material.
Highlights
In recent years, numerous methods have been developed for the fabrication of novel porous alumina bodies [1,2,3,4]
The irregularities confirmed on the surface of the alumina platelet in Figure 3(b) are considered to be a gelatin film that covers the surface of the platelets
Porous alumina bodies were successfully fabricated by a freeze-drying technique, using α-alumina platelets and a gelatin-sol
Summary
Numerous methods have been developed for the fabrication of novel porous alumina bodies [1,2,3,4] These materials are expected to have various applications, including as filters, thermal insulators, catalyst carriers, and refractory clinkers [5,6,7,8,9,10,11]. In most cases, these studies aimed to achieve both high porosity with a honeycomb structure and improvement in mechanical strength in a specific direction, and were not suitable for refractory clinker applications. The freeze-drying method produces a house-of-cards structure from the alumina platelets, and the application of a gelatin-sol maintains this structure, resulting in increases in both mechanical strength and porosity. The mechanical strength and thermal conductivity of the resulting house-of-cards structured porous alumina were investigated and compared with those of honeycomb structured porous alumina and porous alumina produced by using yeast as a pore former
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