3 results about "Composite ceramic" patented technology

The invention provides a SiC whisker synergistic silicon nitride particle toughened alumina-based ceramic cutter material and a preparation process thereof. The preparation method comprises the following steps: preparing SiC whiskers and a sintering aid into slurry, uniformly mixing the slurry with Al2O3 and Si3N4, drying to obtain composite ceramic powder, pre-pressing the composite ceramic powder into a green body, and carrying out vacuum hot-pressing sintering on the green body to obtain the alumina-based ceramic cutter material, wherein the heating process of the vacuum hot pressing sintering comprises the following steps: heating to 190-210 DEG C at a first heating rate, keeping the temperature, heating to 1350-1450 DEG C at a second heating rate, keeping the temperature, heating to 1500-1650 DEG C at a third heating rate, and keeping the temperature; in the heating process of vacuum hot-pressing sintering, the green body is firstly kept pre-pressed, when the temperature rises to1050-1150 DEG C, the pressure of the green body is started to be increased and kept, and when the temperature continues to rise from 1350-1450 DEG C, the pressure of the green body continues to be increased until the temperature rising is ended, and the pressure is kept.

The invention discloses a transparent high-temperature-resistant anti-corrosion nano composite ceramic coating suitable for a welding part. The coating comprises nano silicon oxide, nano aluminum oxide, nano zirconium oxide, a silicon modified water-based additive, a water-based dispersant, a water-based leveling agent, a water-based suspension stabilizer, a water-based curing agent, a water-based wetting agent, a water-based PH value regulator, a water-based low-temperature anti-freezing solution and deionized water, the transparent high-temperature-resistant anti-corrosion nano composite ceramic coating can realize transparent and ultrathin high-precision corrosion resistance on the welding part, and the used coating is high-temperature-resistant, boiling-resistant, damp-heat-resistant; meanwhile, the coating is a pure water-based environment-friendly coating, and VOCS is lower than 5 g/L; the coating reaches the food grade, meets the FDA related requirements, is easy to use, can be used in a traditional coating mode, and is high in cost performance, the maximum coating plane area of 1 kilogram of the coating can exceed 50 square meters, and the use cost is lower.

The invention relates to a method for preparing carbonitride-silicide solid solution composite ceramic at a low temperature by a reaction hot pressing sintering technology, and belongs to the field of multiphase ceramic materials. The invention aims to solve the technical problems of poor sinterability and high-temperature performance of the existing multiphase ceramic. The method comprises the following steps: 1, mixing carbide powder, carbonitride powder and silicon powder, and carrying out ball milling to obtain composite powder; and 2, sintering the composite powder obtained in the step 1 to obtain the carbonitride-silicide solid solution composite ceramic. Fourth subgroup carbides and carbonitride capable of generating solid-phase exchange are selected, the solid-phase reaction and the solid-solution coupling synergistic process of original powder in the sintering process are fully utilized, an anion-cation dual solid solution or split-phase solid solution can be formed, and compared with a traditional means, the sintering temperature can be reduced by 300-500 DEG C. And the relatively low sintering temperature ensures that the material prepared by the method has a fine average grain size, and the strength and the hardness of the material are remarkably improved.