The invention relates to a device, which operates at high temperature, in particular up to 550 C., and in particular between 50 and 350 C., such as an oven or a part of an oven, this device being equipped with at least one insulating product formed from at least one insulating material ,based>on aerogel(s), advantageously in the form of at least one layer, in particular of at least one fibrous layer. based on aerogel(s), said product comprising less than 0.55% by weight of hydrophobizing agent(s).

The invention also relates to the insulating product suitable for this device and to the use of this product for a high-temperature application.

Exemplary embodiments relate to a batch for producing an unshaped refractory ceramic product, to a method for producing a fired refractory ceramic product, to a fired refractory ceramic product and to the use of an unshaped refractory ceramic product.

A composition of matter for use as an electrode in batteries, fuel cells and other applications, that may or may not be primarily composed of graphite, Portland Cement, pozzolans and water. Organic polymers, additives, reinforcements, fillers, catalysts, current collectors, and other materials may be included in vast ranges and proportions. Large graphite electrodes and other useful products are fabricated integrating concrete with chemical and electrical sciences. Batteries, fuel cells, thermal energy systems, conductive paints, fireproof coatings, metal casting forms, crucibles, fire bricks, graphite electrodes for electroplating, electric arc furnaces, and other applications may make use of the composition. For example, an air battery cathode composed of 50 grams white portland cement, 7 grams metakaolin pozzolan, and 700 grams of properly mixed graphite particle sizes. Dry components mixed with a water based liquid component start the cementing reactions. Mixing, forming and curing play important roles in the final composition properties.

The invention relates to a batch for producing an unshaped refractory ceramic product, to a method for producing a fired refractory ceramic product, to a fired refractory ceramic product and to the use of an unshaped refractory ceramic product.

Provided is a method for preparing a bulk CAlN composite aerogel with high strength and high temperature resistance, which includes: evenly stirring aluminum chloride crystals, water, ethanol and epoxy propane, to obtain a clear aluminum oxide sol solution, then adding formaldehyde and resorcinol to the solution and performing even stirring, to obtain an RF/Al.sub.2O.sub.3 composite aerogel sol solution, leaving the gel to stand, treating the sample by using a supercritical CO.sub.2 drying method, and finally heat-treating the sample at a high temperature under the condition of nitrogen, to obtain the bulk CAlN composite aerogel with high strength and high temperature resistance. The composite aerogel prepared by using this method has advantages of high integrity, high specific surface area, intact structure, low heat conductivity, low density, and high strength.

A heat insulator including a porous sintered body having a porosity of 70 vol % or more, pores having a pore size of more than 1000 m in a proportion of 10 vol % or less of all pores and pores having a pore size of 0.8 m or more and less than 10 m occupy 50 vol % or more and 80 vol % or less of pores having a pore size of 1000 m or less, while pores having a pore size of 0.01 m or more and less than 0.8 occupy 10 vol % or more and 30 vol % or less pores having a pore size of 1000 m or less. The porous sintered body is formed from MgAl.sub.2O.sub.4 raw material and includes a fibrous layer formed from inorganic material fibers, the heat conductivity of the heat insulator at 1000 C. or more and 1500 C. or less being 0.40 W/m.Math.K) or less.

The presently disclosed and/or claimed inventive process concept(s) relates generally to a water soluble or water dispersible composition comprising a copolymer and use in oil field. More particularly, the presently disclosed and/or claimed inventive concept(s) relates to the copolymers comprising allyloxy linkage and its function derivatives and its use in oil field such as a high temperature cement retarder composition.