| abstract |
The present invention relates to a novel process for the production of ceramic materials, in particular refractory materials having a reduced relative density. More particularly, the present invention relates to a method of making a lightweight refractory material having non-adjacent pores based on molded and non-molded materials. These materials can be used as working lining in high temperature applications. The method is based on forming spherical closure and isolated pores within the structure of the material. Polymer particles, especially polymethacrylates, especially polymers and / or copolymers prepared by suspension polymerization, are used as the burn-outable pore-former to produce pores having pore diameters that can be set in a desired manner. The polymers and / or copolymers are in the form of small spheres having a predetermined diameter. The introduction of isolated spherical pores enables the production of ceramic materials with sometimes significantly reduced relative density and improved corrosion resistance and better mechanical strength compared to the prior art. At the same time, certain closed pore systems contribute to the reduction of the thermal conductivity of the ceramic material. In addition, the novel process has the advantage that there is no risk of forming undesired black cores, even in the production of thick film ceramic products. |