High-air-permeability spherical ceramic particle sand for casting mold core and preparation method and application of high-air-permeability spherical ceramic particle sand

Abstract

The invention provides high-air-permeability spherical ceramic particle sand for casting a mold core and a preparation method and application of the high-air-permeability spherical ceramic particle sand. The spherical ceramic particle sand is prepared from, by mass, 5%-7% of zirconium oxide, 6%-8% of silicon dioxide, 60%-62% of aluminum oxide, 6%-9% of magnesium oxide, 2%-4% of yttrium oxide, 3%-4% of modifier, 2%-3% of dispersing agent and the balance bentonite. The ceramic particle sand is high in sphericity degree and small in thermal expansion coefficient, the use amount of a binder needed when the ceramic particle sand is used for casting a mold core is small, and the size precision of the mold core and an aluminum alloy casting is higher; the ceramic particle sand is good in heat resistance and high in abrasion resistance, can be repeatedly used for multiple times through heating, mixing and grinding during casting production, and is low in batch use cost and lower in environmental pollution.

Description

technical field [0001] The invention belongs to the field of casting and casting auxiliary materials, and particularly relates to a high-permeability spherical ceramic particle sand for a casting core and a preparation method and application thereof. Background technique [0002] Aluminum alloy has low density, high specific strength / stiffness, good corrosion resistance, good plasticity, excellent processing performance, and has good welding performance, excellent electrical conductivity and thermal conductivity, and has been widely used in the field of military equipment. According to the processing technology, aluminum alloys can be mainly divided into two types: deformed aluminum alloys and cast aluminum alloys. Among them, cast aluminum alloys have good process flow properties and medium load bearing capacity. It has been widely used in the manufacture of products such as box, engine oil pipeline, automobile engine cylinder block, automobile engine cylinder head and so o...

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Problems solved by technology

[0004] In order to solve the shortcomings of traditional silica sand materials such as different particle sizes, low heat resistance, high angle coefficient, large thermal expansion coefficient, and large binder consumption when manufacturing casting cores for complex precision aluminum alloy castings, the invention provides a High-permeability spherical ceramic particle sand for casting cores and its preparation method and application, the spherical ceramic particle sand has fine particles, uniform size, high gas permeability, high heat resistance, high wear resistance, low angle coefficient, thermal expansion The characteristics of small coefficient, high degree of spheroidization, and reusability; the present invention can also realize the coordinated control of the physical and chemical properties of ceramic particle sand through the selection of its components and the regulation of mass ratio, and manufacture suitable for Ceramic granular sand for casting cores for complex precision aluminum alloy castings, realizing short-cycle, low-cost, low-pollution green casting of complex precision aluminum alloy castings for military equipment and new energy vehicles, with obvious economic benefits

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