摘要:
Mix which comprises a) one or more very finely divided silicon dioxide powders having an average particle diameter of from 2 to 100 nm and a BET surface area of at least 30 m 2 /g, b) one or more particulate components selected from the group consisting of oxides, carbides and nitrides, in each case having an average particle diameter of from > 0.5 μm to 30 mm, c) one or more synthetic resins as binders and d) one or more metallic antioxidants having an average particle diameter of from > 0.5 to 250 μm. Process for producing a shaped body, in which to the mix is introduced into a mould, pressed if appropriate and heated to a temperature at which the synthetic resin crosslinks thermally. Shaped body which can be obtained therefrom. Process for producing a refractory shaped body, in which the shaped body is carbonized. Refractory shaped body which can be obtained therefrom.
摘要:
A dispersion which is free of binders and which contains titanium dioxide and at least one water-soluble poly- carboxylate ether, where - the titanium dioxide has a BET surface area of 20 to 400 m2/g, the water-soluble polycarboxylate ether is a copolymer based on at least one oxyalkylene glycol compound and at least one unsaturated monocarboxylic acid derivative or dicarboxylic acid derivative, the dispersion has a content of titanium dioxide of 5 to 50% by weight, based on the total amount of the dispersion.
摘要:
A dispersion which is free of binders and which contains silicon dioxide and at least one water-soluble polycarboxylate ether, where - the silicon dioxide is a pyrogenic silicon dioxide which is present in the form of aggregated primary particles having a BET surface area of 50 to 250 m2/g, and - the aggregates in the dispersion have a mean diameter of less than 1 μm, - based on the total amount of the dispersion, - the water-soluble polycarboxylate ether is a copolymer based on at least one oxyalkylene glycol compound and at least one unsaturated monocarboxylic acid derivative or dicarboxylic acid derivative, - the weight ratio of polycarboxylate ether/silicon dioxide is 0.01 to 100.
摘要:
Preparation for producing refractory materials, characterized in that it comprises one or more particulate, refractory components and one or more binders, where - the particulate, refractory component has a mean particle diameter of > 0.3 m and - the binder is selected from among - from 0.05 to 50% by weight of a very finely particulate binder having a mean particle diameter of from 10 nm to 0.3 m selected from the group consisting of aluminium oxide, titanium dioxide, zirconium dioxide and/or mixed oxides of the abovementioned oxides, - from 0 to 20% by weight of an inorganic binder, from 0 to 20% by weight of a hydraulically setting binder, - from 0 to 15% by weight of an organic, silicon-free binder - and the preparation additionally contains from 0 to 35% by weight of water, where - the proportion of the particulate, refractory component is equal to 100 and the percentages of the further materials in the preparation are based on the particulate component.
摘要:
Process for the infiltration of porous ceramic components, in which a dispersion containing metal oxide particles and having a metal oxide content of at least 30% by weight, based on the dispersion, is used, where the particle size distribution d 50 of the metal oxide particles is not more than 200 nm.
摘要:
Use of pyrogenic metal oxide for the manufacture of a selfcompacting composition comprising hydraulic binders and having high early strength, the composition comprising at least one hydraulic binder and water as further constituents and the product of the BET surface area, in m2/g, of the pyrogenic metal oxide and the proportion by weight of the pyrogenic metal oxide based on the hydraulic binder being 20 to 200 m2/100 g of hydraulic binder.
摘要:
A process for the preparation of products of high early strength comprising hydraulic binders, in which a hydraulic binder, water and 0.1 to 5% by weight, based on the hydraulic binder, of a finely divided titanium dioxide are mixed with agitation and in any desired sequence.
摘要:
Use of a pulverulent composition comprising an inorganic binder and, based on the binder, 0.25 to 5% by weight of finely divided titania for the preparation of products having high early strength.