Environmental Effects on the Mechanical Properties of SiC-Based Hot Gas Cleaning Filters

Studies on processing of layered oxide‐bonded porous sic ceramic filter materials

“…Avrami exponent (n) was derived from Equation (7). Frequency factor (K o ) was derived from Equation ( 6) using the values of n and ln[K o f(x)].…”

“…SiC ceramic filters are used as they have high strength, low thermal expansion coefficient, and excellent thermal shock resistance and are highly durable and reliable. Investigations on measurement of mechanical properties , thermal shock resistance, and corrosion resistance of the ceramics are reported and they are conducted mostly for commercial filters 6–15 . Studies on determination of filtration efficiency and the effects of temperature, dust properties, dust cake formation, cleaning cycles, etc., on the pressure drop of the filters were also carried out 16–20 .…”

“…Continuous efforts are afoot for development of SiC ceramic filters with improved properties; however, very limited information is available about such developmental activities. Commonly available commercial filters are produced using ~20 wt% clay binder, but the filters often fail in long service duration as the binder phase deteriorates at high temperatures in the presence of steam and alkali 6,7 . Reduction of amount of clay binder has been considered to be advantageous.…”

“…Investigations on measurement of mechanical properties , thermal shock resistance, and corrosion resistance of the ceramics are reported and they are conducted mostly for commercial filters. [6][7][8][9][10][11][12][13][14][15] Studies on determination of filtration efficiency and the effects of temperature, dust properties, dust cake formation, cleaning cycles, etc., on the pressure drop of the filters were also carried out. [16][17][18][19][20] Successful operation of commercial filters at severe conditions and at higher temperatures for long duration is still an issue and for this the intrinsic material properties of filters need to be looked in depth.…”

“…commercial filters are produced using ~20 wt% clay binder, but the filters often fail in long service duration as the binder phase deteriorates at high temperatures in the presence of steam and alkali. 6,7 Reduction of amount of clay binder has been considered to be advantageous. In order to realize low-temperature processing of porous SiC ceramics, in situ oxidation-derived silica from SiC or reaction-derived secondary bond phases (mullite, cordierite, etc) formed in the presence of additives (Al 2 O 3 and MgO) were preferred choices for binding SiC particles.…”