Coated sand for sample cup for analysis of liquid metal characteristics

Abstract

The invention relates to precoated sand for a molten metal characteristic analysis sample cup. The sample cup made of precoated sand is used for containing metallic solution and measuring the characteristics of the metallic solution, and belongs to the technical field of casting. The precoated sand is prepared from the following raw materials: crude sand, a binder, a solidifying agent, a plasticizer and a lubricating agent, ad is characterized in that the using amount of the solidifying agent is 40-50% that of the binder, the using amount of the binder is 3-5% that of the crude sands, the using amount of the plasticizer is 1-5% that of the binder, and the using amount of the lubricating agent is 0.1-0.5% that of the crude sand. The precoated sand has the beneficial effects that the raw material ratio of the precoated sand is reasonable, the high temperature resistance of the precoated sand is enhanced remarkably, particularly, aluminum phosphate for the binder has a high-temperature binding function, aluminum dihydrogen tripolyphosphate has a flame resistance effect, graphite powder has a function of enhancing the strength of a carbon framework subjected to resin combustion, aluminum phosphate, aluminum dihydrogen tripolyphosphate and the graphite powder are harmonized, the high temperature resistance of the sample cup is improved, the sample cup is not cracked, delaminated and subjected to sand dropping within four minutes after molten metal is poured, and the cast molten metal instantaneous analysis technical requirement can be met.

Description

technical field [0001] The invention relates to coated sand for a metal property analysis sample cup. The sample cup made of the coated sand is used for containing molten metal and measuring the properties of the molten metal, belonging to the technical field of casting. Background technique [0002] Coated sand refers to the mold (core) sand covered with a layer of resin film on the surface of the sand grains. The existing manufacturing method of coated sand is: first heat the sand to a predetermined temperature, then add thermoplastic phenolic resin, the resin is heated and melted, and is coated on the surface of the sand through the stirring of the sand mixer, and then the curing agent hexamethylene The tetraamine aqueous solution is stirred evenly, and the lubricant is added, and after stirring, cooling, crushing, and sieving, it becomes coated sand. The molding method of the coated sand is: the coated sand is injected into the hot core box heated to about 230°C through...

AI Technical Summary

Problems solved by technology

However, due to the high temperature of the molten metal, the sample cup can only be maintained for a short period of time after the molten metal is injected, and will soon crack and peel off. At present, the measurement time for the analysis of the characteristics of the molten metal needs to be more than 4 minutes, while ordinary coated sand Manufactured sample cups cannot meet the requirements of the detection time