Preparation method of rare earth ceramic foam filter

Abstract

The invention belongs to the technical field of a preparation method of a ceramic filter for casting and relates to a preparation method of a rare earth ceramic foam filter. The preparation method comprises the following steps of preparing ceramic pulp: mixing rare earth, ceramic aggregate and an adhesive in parts by weight to prepare ceramic pulp A and ceramic pulp B; preparing a blank: dipping a polyurethane foam carrier into the ceramic pulp A, sufficiently absorbing the ceramic pulp A, carrying out roll forming via roll forming equipment to prepare the blank, reinforcing the upper surface, the lower surface and a core of the blank twice via glazing equipment after drying the blank; and carrying out high-temperature sintering: putting the blank after twice reinforcing and drying into a high-temperature sintering furnace for sintering to form the rare earth ceramic foam filter. A sintering period is short; the energy is saved; the breakage of the blank is avoided; at the same time, the pulp is adhered more uniformly; the blank is reinforced twice via glazing; the internal pulp is distributed uniformly and has low possibility of falling-off; and the property of a sintered product is stable.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of ceramic filters for casting, and in particular relates to a preparation method of rare earth foam ceramic filters. Background technique [0002] Rare earth elements refer to Group IIIB in the periodic table of elements. Rare earth elements have a unique arrangement of extranuclear electrons, which can effectively improve the performance of metals and alloy materials. In recent years, the research and development of new rare earth materials and their application in high-tech industries have been regarded as a standard for the development of a country's high-tech level. Studies have shown that the influence of rare earths on the structure of metals and their alloys is mainly reflected in three functions: (1) Purification: First, the affinity between rare earths and oxygen, sulfur, and hydrogen is very strong, forming a high melting point and thermal stability. Rare earth compounds wi...

AI Technical Summary

Problems solved by technology

However, due to the limitation of pore size and flow rate, it is difficult to effectively filter and purify a large number of small inclusions and harmful impurities in metal and alloy melts, which makes the ceramic foam filter an important role in the filtration and purification technology of metal alloy melts. The promotion and application are greatly restricted, and it cannot meet the requirements of a large number of products that are demanding on the filtration of metals and their alloy melts

[0004] Chinese patent application 201010511259.4 discloses a method for preparing a yttrium oxide foam ceramic filter. The third foam ceramic filter blank is immersed in the component B ceramic slurry prepared in step 2, and taken out after immersion for 1 to 5 minutes to obtain The second impregnated body; then the second impregnated body is installed on the centrifuge, and the excess B component ceramic slurry in the second impregnated body is removed under the condition of centrifugal slurry rejection, so as to obtain the fourth foam ceramic filter green body; followed by drying After sintering and centrifugation, the slurry inside the embryo body is not evenly distributed, and the structure of polyurethane foam is easily damaged during the centrifugation process