Water-soluble ceramic core and preparation method thereof

Abstract

The invention relates to a ceramic core, in particular to a water-soluble ceramic core and a preparation method thereof, which can be used in investment casting of a casting with a complex cavity structure or a hollow casting with casting temperature of not greater than 900 DEG C. The water-soluble ceramic core is obtained by specifically taking fused corundum powder, zircon sand and sodium chloride particles as main body materials and NaCl solution and polyethylene glycol as adhesives through a specific mixing process by using low-temperature drying and a high-temperature roasting process. According to the water-soluble ceramic core, not only is the strength of the core guaranteed, but also the core has good moldability; and the water-soluble ceramic core has the advantages of convenience and quickness in operation (the core is only required to be washed with clear water and can be easily removed in a short time), no pollution, no need of special equipment, no damage to the casting and the like.

Description

technical field [0001] The invention relates to a ceramic core, in particular to a water-soluble ceramic core and its preparation method, which can be used for pouring temperature not exceeding 900 ? C has a complex inner cavity structure or investment casting of hollow castings. Background technique [0002] 2011 is the opening year for the development of my country's parts and components industry. The "Industrial Structure Adjustment Guidance Catalog (2011 Version)" clearly pointed out the importance of developing parts and components, and the rapid development of the automobile industry, ships, weapons and aerospace industries gave birth to The market demand for aluminum alloy casting parts with complex inner cavities and curved channels has resulted in high-strength resin sand cores being widely used in the production of such castings, but it has caused serious environmental pollution; If the air volume is too large, it is easy to produce stomata defects. [0003] Genera...

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Problems solved by technology

[0002]2011 is the opening year for the development of my country's spare parts industry. The "Industrial Structure Adjustment Guidance Catalog (2011 Version)" clearly pointed out the importance of developing spare parts. The rapid development of the automobile industry, ships, weapons and aerospace industries has given rise to the market demand for aluminum alloy casting parts with complex inner cavities and curved channels, resulting in high-strength resin sand cores being widely used in such castings production, but caused serious environmental pollution; and the resin sand core has a large amount of gas generation, which is prone to pore defects

[0005]Water-soluble core technology has emerged with the development of modern industrial technology, especially the development of the aviation industry. It is mainly used to solve the complex inner cavity and pores in aircraft components However, the application of this technology in our country is not yet popular; according to reports, Hefei University of Technology and other units have successfully developed fused corundum soluble cores; Chengdu Dongfang Electric Machinery Factory has successfully developed potassium carbonate silica sand soluble cores; Meng Shuangfen et al. It has been successfully used in water-soluble cores for the production of steam turbine steel castings; there are also some reports on the development and application of this technology in foreign countries. Aluminum alloy water-cooled plate for mechanical cooling. The overall size of this water-cooled plate is 740×480mm, the thickness is 20 mm, and the cooling water pipe is designed in the wall; Miller and Charles et al. use MgO or CaO as the base material to sinter ceramics Core, successfully cast nickel-based and diamond-based superalloy turbine blades, guide vanes and other complex castings, but usually water-soluble ceramic cores use soluble inorganic salts as binders, resulting in poor heat resistance and low strength of the core , needs higher pressure during molding, is easy to crack when solidified and shrinks, and is easy to cause corrosion to castings, etc., which urgently need to be improved or overcome.

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