Lost foam casting cast iron coating for preventing carbon defects and preparation method thereof

A technology of lost foam casting and carbon defects, which is applied to casting molding equipment, coatings, casting molds, etc., can solve the problems of special coating products that do not reduce or eliminate carbon defects in iron castings, and achieve good suspension and thixotropy, operation Convenience, smooth finish

Inactive Publication Date: 2010-07-07
NANTONG XINZHENGDA SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Based on the domestic research and application situation, there is no special coating product specially used to reduce or eliminate carbon defects in iron castings in China, and it can be used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] According to mass percentage, take bauxite 60.5%, kaolin 17.5%, talcum powder 3.5%, attapulgite stick clay 3.5%, sodium lignosulfonate 0.4%, aluminum sulfate 6%, polyvinyl alcohol 3.49%, silica sol 5.0% %, iron oxide powder 0.1% and n-octanol 0.01%;

[0050] According to the mass ratio of 1:5, the attapulgite stick clay is mixed with water, stirred evenly, and left to stand for 70 hours to obtain the attapulgite stick clay water mixture;

[0051] According to the mass ratio of 1:5, slowly add the polyvinyl alcohol obtained in step 1 into water and fully stir for 10 minutes, stop stirring and soak for 30 minutes, then slowly heat to 95°C and keep fully stirring until the solution is clear and there are no visible transparent particles. To, make polyvinyl alcohol aqueous solution;

[0052] According to the mass ratio of 1:5, the aluminum sulfate obtained in step 1 is mixed with water, stirred evenly, and the aluminum sulfate aqueous solution is obtained;

[0053] Mix ba...

Embodiment 2

[0057] According to mass percentage, take bauxite 64.2%, kaolin 13.5%, talcum powder 6.0%, attapulgite stick clay 3%, sodium lignosulfonate 0.7%, aluminum sulfate 5.88%, polyvinyl alcohol 1.7%, silica sol 4.8% %, iron oxide powder 0.2% and n-octanol 0.02%;

[0058] According to the mass ratio of 1:3, the attapulgite stick clay is mixed with water, stirred evenly, and left to stand for 75 hours to obtain the attapulgite stick clay water mixture;

[0059] According to the mass ratio of 1:3, slowly add the polyvinyl alcohol obtained in step 1 into water and fully stir for 10 minutes, stop stirring and soak for 60 minutes, then slowly heat to 75°C and fully stir until the solution is clear and there are no visible transparent particles. , making polyvinyl alcohol aqueous solution;

[0060] According to the mass ratio of 1:4, the aluminum sulfate obtained in step 1 is mixed with water, stirred evenly, and the aluminum sulfate aqueous solution is obtained;

[0061] Mix bauxite, ka...

Embodiment 3

[0065] According to mass percentage, take bauxite 64.5%, kaolin 17.435%, talcum powder 5.9%, attapulgite stick clay 1.7%, sodium lignosulfonate 0.8%, aluminum sulfate 2.5%, polyvinyl alcohol 3.5%, silica sol 3.5% %, iron oxide powder 0.15% and n-octanol 0.015%;

[0066] According to the mass ratio of 1:6, the attapulgite stick clay obtained in step 1 was mixed with water, stirred evenly, and left to stand for 72 hours to obtain the attapulgite stick clay water mixture;

[0067] According to the mass ratio of 1:6, slowly add polyvinyl alcohol into water and fully stir for 5 minutes, stop stirring and soak for 45 minutes. Then slowly heat to 85°C and fully stir until the solution is clear and there are no visible transparent particles, then the polyvinyl alcohol aqueous solution can be prepared;

[0068] According to the mass ratio of 1: 6, the aluminum sulfate obtained in step 1 is mixed with water, stirred evenly, and the aluminum sulfate aqueous solution is obtained;

[006...

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Abstract

The invention discloses a lost foam casting cast iron coating for preventing carbon defects, which comprises the following components by weight percent: 60.5%-64.5% of bauxite, 13.5-17.5% of kaolin, 3.5%-6.0% of talc powder, 1.7%-3.5% of attapulgite, 0.4%-0.8% of sodium lignosulphonate, 2.5%-6.0% of aluminum sulfate, 1.7%-3.5% of polyvinyl alcohol, 3.5%-5.0% of silica sol, 0.1%-0.2% of iron oxide powder and 0.01%-0.02% of n-octanol, and the sum of the components is 100%. The lost foam casting cast iron coating is prepared by respectively preparing water solution of the attapulgite, the polyvinyl alcohol and the aluminum sulfate, evenly mixing the bauxite, the kaolin, the talc powder and the iron oxide powder for preparing mixed powder material, mixing the water solution of the attapulgite, the polyvinyl alcohol and the aluminum sulfate, the silica sol and the refractory mixed powder material with the n-octanol, stirring and grinding. The coating has the advantages of good thixotropy, good coating property, high coating strength and good gas permeability; and the surface of a cast is smooth and has no wrinkles and other carbon defects.

Description

technical field [0001] The invention belongs to the technical field of metal liquid forming, and in particular relates to a lost foam casting cast iron coating for preventing carbon defects, and also relates to a preparation method of the casting coating. Background technique [0002] Lost foam casting is to combine the plastic foam model with the same size and shape as the casting and the riser system made of the same material to form a model cluster, brush the lost foam paint and dry it, and bury it in the dry sand of the special sand box Vibrating and compacting the molding, using vacuum equipment to connect a special sand box to evacuate, pouring high-temperature metal liquid under the condition of maintaining a certain negative pressure in the mold to melt and gasify the mold, and the decomposition products escape through the coating / mould interface, and the liquid state A casting method in which metal occupies the position of the model, solidifies and cools to form a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C7/02
Inventor 张忠明徐春杰林尤栋
Owner NANTONG XINZHENGDA SPECIAL STEEL
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