Manufacture of Fine-Pored Ceramics by the Gelcasting Method

Abstract

The fine-pored materials represent a wide range of applications and searches are being continued to develop methods of their manufacturing. In the article, based on measurements on fine-grained powders of Al2O3, TiO2, and SiO2, it has been demonstrated that gelcasting can be relatively simple method of obtaining of nanoporous materials with high values of both specific surface area and open porosity. The powders were dispersed in silica sol, and the gelling initiator was NH4Cl. The usefulness of experiment design theory for developing of fine-pored materials with high porosity and specific surface area was also shown.

Cellular SiC/Iron Alloy Composite

“…1). These samples were filled with a gelling slurry [30] After gelling, the preforms were heat treated at 600°C in air atmosphere. In such conditions, the foam burns out completely and a porous material is obtained with open channels that replicate the original polymer foam structure.…”

Three-Dimensional Digital Reconstruction of Ti2AlC Ceramic Foams Produced by the Gelcast Method

“…Because of the very low values of the Knudsen number, well below the threshold limit of 0.01, the continuum approach was adopted. In the continuum flow regime the thermodynamic equilibrium near the walls and the no-slip boundary conditions are inherently valid [11]. Since the Reynolds number was on the order of unity, the laminar regime was also adopted for the viscous description and the momentum and mass conservations were described by the Navier-Stokes equations.…”

“…In filters, for example, the performance of gelcast ceramic foams in removing solid particulates from gas flow is highly dependent on the pore window diameter of the foam [10]. In this paper, the focus was placed on Ti 2 AlC produced by the gelcasting method, which is considered a suitable method for obtaining porous materials with a set shape [11]. Gelcasting is a foam production method that is based on the traditional method of forming ceramic materials from casting slips combined with a polymerization reaction.…”