Cellular Ceramics Produced from Ceramic Shell: Processing and Characterization

Abstract

In this work, ceramic shell (mullite source), an industrial solid waste from the lost-wax casting process, after crushing and milling steps, was used and evaluated as an alternative raw material source for the production of cellular ceramics for high temperature applications (> 1400 °C). The obtained ceramic shell powder, with particle size distribution (d 50 < 2 µm) suitable for the production of ceramic foams, was characterized from the point of view of their physical, chemical, morphological and crystallographic properties. Samples were prepared and obtained by direct foaming and gelcasting routes, dried at room temperature and then fired in two steps (650 °C/2 h and 1550 °C/2 h), and cooled in the furnace to room temperature. The effects of solids loading (35 and 42 vol. %) and stirring velocity (500 and 2000 rpm) on the cellular structure (pore size distribution and porosity) and mechanical properties of the produced ceramic shell foam samples were evaluated. The results showed that it is possible to obtain ceramic foams based on mullite-zirconite, with pore sizes between 100 and 900 µm, porosities up to 77% and compressive strength varying from 3 to 20 MPa.

Evaluating the properties of cellular ceramics prepared with a granite dust and plantain (Musa paradisiaca) peel powder for external wall thermal insulation of buildings

“…Cellular ceramics are a key material suitable for thermal insulation of buildings due to its high surface area and permeability, low density and specific heat, high thermal and acoustic insulation, and high chemical resistance in addition to the fact that it is non-flammable and flame resistant, chemically inert, and non-toxic. Different processing techniques of cellular ceramics include gel casting, replication of a sacrificial foam template, direct foaming of a liquid slurry, burn-out of fugitive pore formers, among others [11,12]. Andreola et al [13] experimented three different manufacturing techniques of porous ceramics and concluded that one technique can be preferable as compared to the others depending on the specific use.…”