High temperature resistant molding sand and preparation method thereof

Abstract

The invention relates to a high temperature resistant molding sand, which is prepared from the following raw materials by weight part: 10-20 of loess, 20-30 of steel slag, 3-4 of beta-semi-hydrated gypsum, 5-6 of methyl sodium silicate, 1-2 of tea saponin, 4-7 of CaO, 5-8 of MnO, 5-8 of furnace black, 5-8 of titanium dioxide, 3-5 of polyethylene oxide, 200-220 of clay, a proper amount water, and 20-30 of an assistant. By using clay, the molding sand provided by the invention has appropriate particle size, good air permeability, good fluidity and good dispersion, also the casting surface is smooth, and the molding sand can be recycled. By using steel slag, the high temperature resistance of clay particles is increased, the molding sand is difficult to cake, and resources are saved. By using methyl sodium silicate, furnace black and polyethylene oxide, the molding sand not only has good caking property, but also has good fluidity and good high temperature collapsibility.

Description

technical field [0001] The invention relates to the field of casting, in particular to a high-temperature-resistant molding sand and a preparation method thereof. Background technique [0002] The main problems that the molding sand exists at present are: 1, particle size is difficult to control, if the molding sand particle size is too large, although the air permeability is better, the surface of the casting is relatively rough, and the finish is not good; if the molding sand material diameter is too small, the air permeability of the sand mold will be caused No, the casting has porosity. 2. Poor heat dissipation, poor chilling effect, and shrinkage porosity and shrinkage cavities are prone to occur inside complex castings. 3. The dispersibility and fluidity are not good, and it is easy to agglomerate and sand beans. 4. Easy to stain castings. 5. Poor mold release. 6. There is a lack of targeted molding sand for different types of alloys. [0003] Traditional clay mol...

AI Technical Summary

Problems solved by technology

[0002] The main problems that the molding sand exists at present are: 1, particle size is difficult to control, if the molding sand particle size is too large, although the air permeability is better, the surface of the casting is relatively rough, and the finish is not good; if the molding sand material diameter is too small, the air permeability of the sand mold will be caused No, the casting has air holes

2. Poor heat dissipation, poor chilling effect, and shrinkage porosity and shrinkage cavities are prone to occur inside complex castings

3. Poor dispersibility and fluidity, easy to agglomerate, sandy beans

4. Easy to stain castings

5. Poor mold release

6. Lack of targeted molding sand for different types of alloys

[0003] Traditional clay molding sand has many advantages, but it has the disadvantages of being difficult to recycle, poor air permeability, poor fluidity, poor dispersibility, poor collapsibility, poor heat dissipation, and serious environmental pollution.