Lost foam coating and preparation method thereof

Abstract

The invention relates to a lost foam coating and a preparation method thereof. The coating comprises the following components: 25 to 35 weight parts of mullite powder, 20 to 30 weight parts of quartz sand, 15 to 25 weight parts of zircon sand, 1 to 3 weight parts of sodium bentonite, 0.5 to 1.5 weight parts of carboxyl methyl cellulose (CMC), 3 to 8 weight parts of polyvinyl acetate, 0.5 to 1.5 weight parts of polyvinyl alcohol, 0.2 to 0.4 weight part of sodium alkyl benzene sulfonate, 0.1 to 0.3 weight part of T-80, 0.2 to 0.4 weight part of n-octanol, and 0.8 to 1.5 weight parts of iron oxide red powder. The lost foam coating has high high-temperature air permeability. After a casting is cooled, a sand sticking phenomenon is eliminated, and a large part of smear is automatically peeled from the surface of the casting. According to spectral analysis of chemical components, the carbon content of the surface of the casting is controlled within the requirement.

Description

technical field [0001] The invention belongs to the field of casting, in particular to the technical field of production of lost foam cast steel. 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 to form a model cluster. After brushing refractory paint and drying, it is buried in dry quartz sand for vibration molding, and poured under negative pressure. , the model is vaporized, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method of castings. [0003] Compared with traditional casting technology, lost foam casting has the following characteristics: 1. Good casting quality and low cost; 2. Unlimited materials and suitable sizes; 3. High dimensional accuracy, smooth surface, and reduced cleaning workload; 4. Internal The defects are greatly reduced and the organization is dense; 5. Large-scale and mass production can be reali...

AI Technical Summary

Problems solved by technology

[0004] Although the lost foam casting process has been developed rapidly at present, when casting low-carbon steel castings, carburization is prone to occur on the surface of the castings, and the increase in carbon on the surface of low-carbon steel will lead to a series of hardness increases, deterioration of processing performance, and decline in corrosion resistance. question

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