The invention relates to a preparation process of
continuous casting slab high-temperature
oxidation resistant coatings, which is characterized in that less than 120 meshes of
powder, reductant containing carbon, inorganic binders, surfactants,
suspending agents and the like with the compositions such as 25-55 wt% SiO2, 10-20 wt% Al203, 11-23 wt% MgO and the like are respectively grinded and mixed evenly, then water is used to be mixed and stirred sufficiently evenly, and finally the density of the coatings are adjusted within 1200-1500 kg / m3. The coatings can not only be sprayed onto
continuous casting slabs at normal temperature, but also be sprayed onto high-temperature
casting slabs, form continuous whole protective
coating layers under the action of high temperature, effectively reduce
temperature drop of the
casting slabs and oxidation burning loss in even heating process of a
heating furnace without changing original performance of matrixes, and effectively decrease
dilution of alloying elements on the surfaces of the
casting slabs. After the casting slabs are out of the
heating furnace, natural spalling capability of the
coating layers is strong, and oxidation matrixes of the casting slabs are smooth. Raw materials of the
oxidation resistant coatings are easy to be obtained, and the coatings have low cost and simple preparation process and are adaptable to
oxidation resistance for various steels when being heated at 700-1300 DEG C / 2-8 hours.