| Abstrakt: |
Abstract: Porous calcium hexaluminate (CaAl SB 12 sb O SB 19 sb or CA SB 6 sb ) is a promising refractory material for thermal insulation applications because it combines low thermal conductivity (0.1-0.5 W•(m•K) SP -1 sp at 1200-1400 °C), suitable mechanical strength (1-10 MPa, uniaxial compression), chemical inertia, good refractoriness (melting temperature of 1830 °C), high resistance to thermal shock, and straightforward processing conditions. Later, in 1999, the Peccini method was adapted to produce a gelled polymer from ethanol, Al(NO SB 3 sb ) SB 3 sb •9H SB 2 sb O, citric acid and calcium acetate (Ca(C SB 2 sb H SB 3 sb O SB 2 sb ) SB 2 sb •H SB 2 sb O) solutions in stoichiometric proportions to generate CA SB 6 sb . Such aggregates are usually combined with other ceramic raw materials (such as calcined or tabular alumina), water, and a hydraulic binder (calcium aluminate cement and hydratable alumina) to produce suspensions that are cast in the desired shape, cured and dried [6]. This occurred because larger particles tend to form regions of high concentration of CaO and greater portions of molten calcium aluminates (C SB 3 sb A, C SB 12 sb A SB 7 sb , and CA). [Extracted from the article] |
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