Silicon Carbide‐ and Boron Carbide‐Based Hard Materials

Electrochemical corrosion of silicon-infiltrated silicon carbide ceramics in aqueous solutions

“…Silicon carbide materials, and solid state-sintered silicon carbide materials (SSiC) in particular [1], have found widespread use as seals, bearings and valves in a variety of media in industrial wear applications. SiC materials are used on account of their good tribological properties [1] and high corrosion resistance [1][2][3][4].…”

Corrosion of Ceramic Materials

“…Bubbles can also be formed by impurities with higher oxidation rates (e.g. carbon in SiC) (Nickel et al, 2010;Nickel & Gogotsi, 2000;Schmalzried & Schwetz, 2010). Oxidation is strongly influenced by the porosity in the material.…”

“…The different kinds of silicon carbide ceramics exhibit different corrosion behavior (Figures 12, 20, 21) (Schmalzried & Schwetz, 2010;Schwetz & Hassler, 2002a, 2002b. Whereas the dense SSiC exhibits very highcorrosion stability in different media and at different temperatures, SiSiC and LPSSiC show lower stabilities due to their compositions and microstructures.…”

“…The specific resistivity at room temperature can be in the range of more than 1 MUm to <1 Um depending on the doping of the grains and the grain boundary phase (Ihle, Martin, Herrmann, et al, 2006;Kleebe & Siegel, 2003;Sauti, Can, McLachlan, & Herrmann, 2007;Schmalzried & Schwetz, 2010;Siegelin, Kleebe, & Sigl, 2003). The reaction of SiC with acids, bases and water is a redox reaction and therefore a chemical potential in contact with water can be formed as in the case of metals (Figures 22 and 23; standard potentials are given in the literature (Sydow, Sempf, et al, 2011)).…”

“…Corrosion behavior is therefore a property not of the material, but of the system including the material, the media and conditions such as temperature, pressure, medium type and volume or flow rate, and tribological as well as mechanical loads. Therefore, a simple statement concerning corrosion resistance of a material cannot be given because the material may be stable under one set of conditions, but unstable under another set of conditions (Jacobson, 1986;Klemm, 2010;Nickel & Gogotsi, 2000;Nickel, Quirmbach, & Pötschke, 2010;Petzow & Herrmann, 2002;Schmalzried & Schwetz, 2010).…”