| 摘要 |
<p>1. A method for producing heat-insulating members for heat insulation purposes in the temperature range between 800 degrees C and 1100 degrees C on the basis of calcium silicate, in which CaO and Si2 react together in a mol ratio of about 0.9:1.0 to 1.1:1.0 with water in excess, and, after shaping, dehydration, hydrothermal hardening and drying, the linear shrinkage of the heat-insulating member thus produced is at most 2% after a 24-hour-long temperature loading of above 800 degrees C, and the CaO component is of caustic lime, calcium hydroxide or the like and the SiO2 component is prorata of crystalline SiO2 and amorphous SiO2 in the form of waterglass and silicic acid, characterised in that a) the waterglass and the silicic acid are made to react in a quantity such as to achieve, related to the calcium silicate of the heat-insulating member, a part by weight of amorphous SiO2 of 6 to 21% and of K2 O or Na2 O of 0.1 to 0.7% ; b) the initial mixture is heated in such a way that a temperature of 40 to 55 degrees C is reached therein at the beginning of a storage phase, known per se, which is to be carried out subsequently, and c) the reaction product, after the storage phase and in a way known per se, is shaped, dehydrated, subjected to hydrothermal hardening and then dried.</p> |
