Ceramsite precoated sand and preparation method thereof

Abstract

The invention discloses ceramsite precoated sand and a preparation method thereof, belongs to the field of casting materials, and particularly relates to a sand core for a casting piece or a shell-core material and a preparation method thereof. The provided ceramsite precoated sand is low in cost, good in performance and simple in preparation. The ceramsite precoated sand is prepared from the following raw materials in parts by mass: 100 parts of crude sand, 1-3 parts of phenolic resin, 0.01-0.2 part of a coupling agent, 0.1-0.45 part of a curing agent, 0.1-0.2 part of a high-temperature-resistant adjuvant and 0.05-0.3 part of a lubricant. The crude sand is ceramsite sand or a mixture of the ceramsite sand and quartz sand. The ceramsite precoated sand is prepared by mainly using features of the ceramsite sand which is simple in preparation process, high in fire resistance degree, low in thermal expansion coefficient, good in angular coefficient and the like. The preparation method forthe ceramsite precoated sand is simple and convenient in operation. The obtained ceramsite precoated sand is good in performance, so the ceramsite precoated sand has a good economic benefit.

Description

Technical field [0001] The invention belongs to the field of casting materials, and specifically relates to a casting mold or core material and a preparation method thereof. Background technique [0002] In the casting production process, the aggregate and main component of the mold are sand. At this stage, the sand used for coated sand casting is mainly quartz sand, non-quartz sand, artificial sand, etc. Among them, quartz sand is mainly ordinary silica sand; non-quartz sand is divided into magnesia, olivine sand, chromite sand, zircon sand, etc.; artificial sand is divided into artificial composite sand, enstatite sand, and carbon particles Sand etc. [0003] With the rapid development of my country's foundry industry, the requirements for foundry materials are getting higher and higher, and some shortcomings of traditional coated sand foundry sand have become more and more prominent. Quartz silica sand has the shortcomings of low refractoriness, large thermal expansion, large...

AI Technical Summary

Problems solved by technology

Quartz silica sand has the disadvantages of low refractoriness, large thermal expansion, large angle coefficient, and poor fluidity, causing defects such as sand sticking, veining, deformation, and cracking in castings

Non-quartz sand is divided into magnesia, olivine sand, chromite sand, zircon sand, etc. Although the comprehensive performance is high, the resources are scarce and expensive

At the same time, because it is mechanically broken during the production process, a large amount of binder will be consumed if the angle coefficient is large; although the manufacturing process of artificial composite sand is simple, the metallurgical composition of the casting is likely to change due to the messy chemical composition. Because of the different manufacturing process of artificial sand, there may be harmful alloy elements mixed into the sand grains, which will damage the metallurgical quality of the casting, and specifically cause defects such as pores, pinholes, slag inclusions, and sand sticking.

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