Molding sand for heat-resistant steel members and preparation method thereof

Abstract

Molding sand for heat-resistant steel members is prepared from the following raw materials in parts by weight: 9-10 parts of bentonite, 5-8 parts of Chinese medical stone powder, 5-7 parts of zinc oxide, 6-9 parts of chromium carbide, 1-1.5 parts of dehydrogenated sodium acetate, 4-5 parts of amino resin, 0.6-0.9 part of sodium stearate, 8-12 parts of calcium oxide, 10-14 parts of magnesium oxide, 1-2 parts of potassium oxide, 20-25 parts of pseudo-boehmite dry sol powder, 15-20 parts of calcium carbonate, 130-160 parts of clay, proper amount of water, and 20-30 parts of an auxiliary agent. The molding sand employs clay for sintering granulation, is good in air permeability and dispersity, and is recyclable. By adding pseudo-boehmite dry sol powder and chromium carbide, the heat resistance of the clay particle is increased. The molding sand is applicable to heat-resistance steel members, a casting surface is not easy for generating blow holes and is fast in heat radiation.

Description

technical field [0001] The invention relates to the field of casting, in particular to a molding sand for heat-resistant steel parts and a preparation method thereof. Background technique [0002] At present, there is a problem that the particle size of the molding sand is difficult to control. If the particle size of the molding sand is too large, although the air permeability is good, the surface of the casting is rough and the finish is not good; Stomata are produced. At present, the molding sand still has the problems of poor fluidity and easy sand beans. [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. [0004] Heat-resistant steel requires molding sand with high air permeability, heat dissipation, and high temperature resistance. Ordinary molding sand is diffi...

AI Technical Summary

Problems solved by technology

[0002] At present, there is a problem that the particle size of the molding sand is difficult to control. If the particle size of the molding sand is too large, although the air permeability is good, the surface of the casting is rough and the finish is not good; porosity

At present, the molding sand still has the problems of poor fluidity and easy sand bean

[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.

[0004] Heat-resistant steel requires molding sand with high air permeability, heat dissipation, and high temperature resistance. Ordinary molding sand is difficult to meet this requirement, or the rate of defective products is high