Energy and the environment


Ceramics are commonly used as filters or membranes when the surrounding environment is very aggressive (high temperature, corrosive fluid, etc.).

Ceramic foams are used, for example, for filtration of aluminium alloys of smelters. They can eliminate inclusions and reduce trapped gas. Silicon carbide filters are designed to filter impurities from steel, grey cast iron and bronze.

Particulate filters are composed of an extruded ceramic honeycomb structure and the channels are clogged alternately to force the passage of gas through the porous walls. Silicon carbide is used because it has high thermal conductivity, which can dissipate heat from soot combustion, and high thermal shock resistance.

Catalytic converters also have ceramic honeycomb structures in which a catalyst is deposited on the surface to degrade gaseous emission pollutants. The catalytic converter is usually made from a low expansion coefficient oxide (cordierite) while catalysts are oxide powders (Al2O3, CeO2, CeO2 / ZrO2 and zeolite) on which noble metals are deposited (platinum, rhodium and palladium).

Ceramic membranes with controlled porosity can be used to filter particles in liquid effluents. Dense ceramic membranes are used at a high temperature to separate the gaseous species by selective permeation. The latter category includes materials such as zirconia rendered ion-conductive by doped yttrium used as a solid electrolyte in fuel cells (SOFC) or lambda sensors, and perovskite oxides, which are both ionic and electronic conductors used in catalytic membrane reactors.

Another important area of use is in the nuclear sector where ceramics are used as fuel (UO2, PuO2), refractory materials, storage elements or for rendering waste inert.

Severe stress (high temperatures, extremely corrosive environments) to which ceramics are subjected require the use of efficient and specific materials for each application.

The CTTC has the expertise and equipment required to develop and create the ceramics alongside your teams to meet your needs, from the design phase to the scale 1 prototype: