MIXTURES OF FORMING MATERIALS BASED ON INORGANIC BINDERS AND METHOD FOR PRODUCING PRESS FORMS AND ROD FOR METAL CASTING

摘要

1. A mixture of molding materials for casting molds and cores for metalworking, containing at least: refractory core molding material, inorganic binder and amorphous SiO in the form of particles, obtained by thermal decomposition of ZrSiO on ZrO and SiO.2. The mixture of molding materials according to claim 1, wherein amorphous SiO in the form of particles is characterized by a BET value of greater than or equal to 1 m / g and less than or equal to 35 m / g, preferably less than or equal to 17 m / g, and particularly preferably less than or equal to 15 m / d.3. A mixture of molding materials according to one of the preceding paragraphs, wherein the average particle size (diameter) determined by dynamically scattering light amorphous with SiO in the form of particles in the molding material mixture is from 0.05 μm to 10 μm, mainly from 0.1 μm to 5 μm and particularly preferably from 0.1 μm to 2 μm. 4. A mixture of molding materials according to claim 1 or 2, where the mixture of molding materials contains amorphous SiO in the form of particles in amounts of 0.1-2 weight. %, preferably 0.1-1.5 weight. %, in each case, based on the main molding material and independently of it, 2-60 weight. % particularly preferably 4-50 weight. %, based on the weight of the binder, where the proportion of solids binder is 25-65 weight. %, preferably 30-60 weight. %.5. A mixture of molding materials according to claim 1 or 2, wherein the amorphous SiO used in the form of particles is characterized by a water content of less than 10 weight. %, mainly less than 5 weight. % and particularly preferably less than 2 weight. %, and it is independently applied mainly in the form of a powder. 6. A molding material mixture according to claim 1 or 2, wherein the molding material mixture contains a maximum of 1 weight. %, preferably a maximum of 0.2 weight. % organic compounds. 7. A mixture of molding materials according to claim 1 or 2, where inorganic