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Carburization preventing coating for ultralow carbon casting resin sand casting

A technology of anti-carburizing paint and resin sand, which is used in casting and molding equipment, coatings, molds, etc., can solve the problems of poor surface stability of sand molds, large grinding allowance, and metal waste.

Inactive Publication Date: 2017-07-18
ANHUI SOLID FOUNDRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of water glass sand casting process to produce large steel castings avoids the casting defects of carburized layer and sulfurized layer on the surface of the casting, but the surface strength of water glass sand is low and easy to absorb moisture, and the surface stability of the sand mold is poor. Casting defects such as inclusions are caused by sand loss; at the same time, the surface quality of steel castings is poor, the grinding allowance is large, the cleaning and shoveling time is long, and the metal waste is serious; and it is difficult to recycle the old sand of sodium silicate, and a large amount of old sand is discharged, resulting in Serious environmental pollution and waste of mineral resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add 3kg carboxymethyl chitosan oligosaccharide and 2kg molecular sieve raw powder to 10kg activated clay, heat up to 115-120°C and keep grinding for 15min, then add 2kg asbestos powder and 0.05kg yttrium oxide, continue to heat at 115-120°C Heat preservation and grinding for 15 minutes to obtain modified clay powder;

[0026] (2) Add 1 kg of hydrolyzed polymaleic anhydride and 1 kg of nano-titanium dioxide to 5 kg of fly ash, and raise the temperature to 110-115 ° C for 30 minutes of heat preservation and grinding to obtain modified fly ash;

[0027] (3) Add 25kg of resin-modified pozzolan, modified clay powder and 5kg of resin-modified ceramic micropowder to 200kg of water, mix well, seal and stand for 1 hour in an environment of 0-5°C, then add modified fly ash and 2kg Sepiolite fiber powder, heated to reflux state and mixed for 15 minutes, the resulting mixture was naturally cooled to room temperature and then sent to a ball mill, ball milled until the output par...

Embodiment 2

[0031] (1) Add 5kg carboxymethyl chitosan oligosaccharide and 2kg molecular sieve raw powder to 15kg activated clay, heat up to 115-120°C and keep grinding for 15min, then add 3kg asbestos powder and 0.05kg yttrium oxide, continue to heat at 115-120°C Heat preservation and grinding for 15 minutes to obtain modified clay powder;

[0032] (2) Add 1 kg of hydrolyzed polymaleic anhydride and 1 kg of nano-titanium dioxide to 10 kg of fly ash, and raise the temperature to 110-115 ° C for 30 minutes of heat preservation and grinding to obtain modified fly ash;

[0033] (3) Add 30kg of resin-modified pozzolan, modified clay powder and 3kg of resin-modified ceramic micropowder to 200kg of water, mix well, seal and stand for 1 hour in an environment of 0-5°C, then add modified fly ash and 2kg Sepiolite fiber powder, heated to reflux state and mixed for 15 minutes, the resulting mixture was naturally cooled to room temperature and then sent to a ball mill, ball milled until the output pa...

Embodiment 3

[0054] The anti-carburization coatings made in Example 1, Example 2, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were sprayed on the surface of the same batch of sand molds made through the same molding sand, and used after the coating was completely dry. The casting of the upper crown and the lower ring of the stainless steel runner of the hydropower station, and the thickness of the surface carburized layer of the castings produced by the processing are measured. The results are shown in Table 1.

[0055] Table 1 Surface carburized layer thickness of castings produced by machining

[0056] Test items Example 1 Example 2 Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Carburized layer thickness 2.32mm 2.28mm 2.56mm 2.83mm 3.24mm 3.85mm

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Abstract

The invention discloses a carburization preventing coating for ultralow carbon casting resin sand casting, and relates to the technical field of the casting industry. The carburization preventing coating comprises following raw materials including, by weight, 25-30 parts of resin modified cinerite, 10-15 parts of activated clay, 5-10 parts of coal ash, 3-5 parts of resin modified ceramic micro powder, 3-5 parts of carboxymethyl chito-oligosaccharide, 2-3 parts of sepiolite fiber powder, 2-3 parts of molecular sieve raw powder, 2-3 parts of asbestos powder, 1-2 parts of hydrolytic polymaleic anhydride, 1-2 parts of nano titanium dioxide, 0.05-0.1 part of yttrium oxide and 150-200 parts of water. The carburization preventing coating plays an excellent carburization preventing role through a formed dual CO gas blockage layer, the thickness of a carburization layer on the surface of an ultralow carbon casting obtained through sand casting after spraying of the carburization preventing coating is lower than 2.5 mm, and the carburization preventing effect is far superior to that of carburization preventing coatings sold on the market at present.

Description

[0001] Technical field: [0002] The invention relates to the technical field of foundry industry, in particular to an anti-carburization coating for resin sand casting of ultra-low carbon castings. [0003] Background technique: [0004] At present, the casting process of castings in my country mainly includes two molding processes of sodium silicate sand and resin sand. The use of water glass sand casting process to produce large steel castings avoids the casting defects of carburized layer and sulfurized layer on the surface of the casting, but the surface strength of water glass sand is low and easy to absorb moisture, and the surface stability of the sand mold is poor. Casting defects such as inclusions are caused by sand loss; at the same time, the surface quality of steel castings is poor, the grinding allowance is large, the cleaning and shoveling time is long, and the metal waste is serious; and it is difficult to recycle the old sand of sodium silicate, and a large am...

Claims

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Application Information

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IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 何祥炎孙国政周万波
Owner ANHUI SOLID FOUNDRY CO LTD
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