A High-Precision Lost Foam Cast Steel Coating

Abstract

The invention discloses a high-precision evanescent mode cast steel coating which consists of the following components in parts by weight: 90-120 parts of fireproof aggregates, 10 parts of auxiliaries, 3 parts of silica sol and 10-50 parts of water, wherein the water serves as a carrier; the fireproof aggregates are a combination of one or several of aluminum-silicon powder, quartz powder and bauxite clinker; the auxiliaries comprise the following internal components in percentage by mass: 15 percent of potato modified starch serving as a binder, 30 percent of Ca-based bentonite serving as a suspending agent, 50 percent of ground calcium carbonate serving as mineral adjustment powder and 5 percent of a surfactant which is FC-4430 fluorine surfactant; the fireproof aggregates are screened by a 200-300-mesh sieve. According to the coating, the surface roughness value of a casting can be reduced, casting defects are prevented, the sand falling and cleaning efficiency of the casting can be effectively improved, and gas generated by pyrolysis of a foam pattern can be effectively discharged out of a casting mold; meanwhile, permeation of metal liquid can be prevented, the strength and the rigidity of the foam pattern can be improved, and deformation of and damage to the pattern are prevented; the high-precision evanescent mode cast steel coating has good heat preservation and insulation effects.

Description

Technical field: [0001] The invention relates to a lost-foam auxiliary material, in particular to a high-precision lost-foam cast steel paint. Background technique [0002] Lost foam casting technology is considered to be the most likely technology to realize green casting in the 21st century, and coating is one of the key technologies of lost foam casting, and its performance determines the success of lost foam casting process. At present, there are many types of lost foam coatings in China, but the quality and price vary. This hinders the development and application of lost foam casting technology to a certain extent. Therefore, the development of lost foam coatings with excellent performance, convenient storage, transportation and use, and high cost performance is of great significance to the popularization and application of lost foam casting technology. [0003] The scientific application of coatings is the key link to stably obtain high-quality castings. The survey s...

AI Technical Summary

Problems solved by technology

[0005] 1) The coating has low high-temperature strength and poor peelability

The phenomenon of sand sticking on the surface of the casting is serious, which increases the cleaning workload and labor intensity of the casting, and makes it difficult to clean the casting later

[0006] 2) Poor paint suspension

The paint is easy to layer and precipitate, and the paint needs to be stirred before each application, which is inconvenient to use

[0007] 3) The strength of the paint layer is low after drying

The appearance is easy to deform and crack during modeling, and the box is easy to collapse during pouring

[0008] 4) The paint layer is easy to crack after drying

Due to the addition of chemical preservatives to the paint, the poor corrosion resistance leads to a short shelf life of the paint

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