Sand adhering prevention cast steel EPC (Expendable Pattern Casting) coating and preparation method thereof

Abstract

The invention discloses a sand adhering prevention cast steel EPC (Expendable Pattern Casting) coating which comprises the following components: bauxite chamotte, graphite powder, bentonite, water glass, carboxymethylcellulose sodium, n-octyl alcohol and fatty alcohol-polyoxyethylene ether. The invention further discloses a preparation method of the sand adhering prevention cast steel EPC coating. Fragment analysis for the sand adhering prevention cast steel EPC coating disclosed by the invention proves that molten steel is not dipped in the coating, refractory aggregate granules in the inner layer of the coating are filled with molten glass, and thus, the molten steel is prevented from being dipped, and a cast is also prevented from being adhered with sand. After the cast is cooled, no sand is adhered on the cast, and most of coating fragments are automatically peeled off from the surface of the cast so that the peel-off effect is obvious. Even through a small amount of coating is not peeled off, the post-treatment is greatly simplified, and a large amount of labors are saved.

Description

technical field [0001] The invention relates to the field of casting, in particular to the technical field of lost foam cast steel manufacturing, and in particular to an lost foam coating for anti-stick sand cast steel and a preparation method thereof. Background technique [0002] Lost foam casting (also known as solid casting) is to bond and combine foam models similar in size and shape to castings into model clusters. After brushing and drying refractory coatings, they are buried in dry quartz sand for vibration modeling and poured under negative pressure. , the model is vaporized, the liquid metal occupies the position of the model, and a new casting method is formed after solidification and cooling. Compared with traditional casting technology, lost foam casting has the following characteristics: 1. Good casting quality and low cost; 2. Unlimited material and suitable size; 3. High dimensional accuracy, smooth surface, and reduced cleaning workload; 4. Internal Defects...

AI Technical Summary

Problems solved by technology

In addition, there is another situation: some coatings do not have suitable chemical composition and sufficient thickness, and it is difficult to prevent high-temperature molten steel from continuing to penetrate into the gap between the molding sand particles. The molten steel penetrates into the molding sand through the coating, resulting in sand sticking on the surface of the casting. Uniform "iron-clad sand" adheres to the surface of the casting

[0006] From the above analysis, we know that this phenomenon can only be avoided by preventing the molten steel from immersing into the gaps between aggregate particles. However, since the aggregate particles should not be too small, otherwise the air permeability will decrease, and the gasification products will not be able to penetrate smoothly, which will cause pores. , Slag inclusion phenomenon, making the casting quality decline

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