Ceramics And Corrosion

He is also coordinator of the collaborative research center 920 of the german research foundation.

Ceramics and corrosion.

Corrosion resistant ceramics are low in porosity high in density. The incorporation of ceramics known as a cermet can modify a material s properties such as density conductivity brittleness insulation and. Christos aneziris is head of ceramics at the institute of ceramics glass and construction materials where his research activities include refractories thermal shock performance corrosion high temperature wettability ceramic filters and metal matrix composites. Sabu thomas preetha balakrishnan m s.

Concrete for example generally is very stable but it contains calcium hydroxide and calcium aluminate which are attacked by sulphates such as calcium sulphate often present in ground water. Corrosion can be concentrated locally to form a pit or crack or it can extend across a wide area more or less uniformly corroding the surface. A balanced mixture of scientists from material science metallurgy physics chemistry and mineralogy sum up the s. Corrosion is often thought of as the oxidation of metals such as iron but ceramics also corrode or react with their environment.

Ceramics are sometimes adhered to metallic surfaces to prevent corrosion and material degradation. As such they are almost unaffected by the oxidation process leading to corrosion. The ability of ceramics to resist corrosion in some cases entirely is the primary reason they are the material of choice for hostile environments. Ceramics ceramco s aluminum oxide and ceramco s zirconium dioxide are already oxides.

Because corrosion is a diffusion controlled process it occurs on exposed surfaces. They are used in a variety of products from wristwatches to cars and spacecraft for this purpose. Corrosion behaviour is one of the most poorly understood characteristics of ceramics. Tungsten carbide usually highly resistant to corrosion is destroyed.