Packless casting temperature-resistant coating

A filler-free, temperature-resistant technology that is applied to casting molding equipment, coatings, molds, etc., and can solve problems such as surface strength loss

Inactive Publication Date: 2009-12-09
徐俊伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a filler-free casting that can solve the surface strength loss of the resin sand core surface due to the high temperature and premature thermal decomposition of the resin binder, resulting in casting defects such as burrs, veins, sand sticking, and sintering. Heat resistant coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0036] Use aluminum dihydrogen phosphate (Al(H2PO4)3+3H2O) or aluminum monohydrogen phosphate (Al(HPO4)3+6H2O) as raw materials.

[0037] The wetting agent is a wetting agent with specifications from TX-10 to TX-16.

[0038] A small amount of wetting agent improves the wettability of the new coating and the sand core surface to facilitate the penetration of the aqueous solution. At the same time, methyl blue is used as an indicator to control the baking degree and facilitate observation.

[0039] Preparation method: After preparing the above raw materials, mix them into a solution.

Embodiment

[0040] Example: (by weight ratio)

[0041] Aluminum hydrogen phosphate

D

Methyl blue

Water

Proportion

Example 1

60％

0.01％

0.001％

The rest is water

1.20

Example 2

62％

0.02％

0.002％

The rest is water

1.25

Example 3

65％

0.03％

0.003％

The rest is water

1.25

Example 4

67％

0.04％

0.004％

The rest is water

1.30

Example 5

70％

0.05％

0.005％

The rest is water

1.30

Example 6

69％

0.02％

0.001％

The rest is water

1.30

Example 7

63％

0.05％

0.003％

The rest is water

1.22

[0042] Aluminum hydrogen phosphate can also be used as a powdered raw material and mixed with water to prepare an aluminum hydrogen phosphate solution with a specific gravity of 1.44±0.03.

[0043] TX in the wetting agents from TX-10 to TX-16 is a non-ionic sur...

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PUM

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Abstract

A packless casting temperature-resistant coating is characterized in that the coating is prepared by the following components by weight percent: 60-70% of aluminium hydrogen phosphate, 0.01-0.05% of wetting agent, 0.001-0.005% of methylene blue and the allowance water and the specific gravity of the prepared solution is 1.2-1.3. The invention has the advantages that the new coating is aqueous solution without any filler so as to avoid all the problems in preparation, storage and use; coating can not be stacked so that castings without surplus or with little surplus can be obtained easily; the effects of avoiding burr, veining, sand penetration and sintering of the coating are incomparable to traditional coatings; blowhole is effectively prevented; the production cost can be promoted to reduce.

Description

Technical field [0001] The invention relates to a surface coating of a sand mold or sand core using organic resin as a binder and quartz sand or other sand as refractory aggregate used in casting production to improve the surface quality of castings and reduce casting defects Filler-free casting temperature resistant coating. Background technique [0002] The molding material (resin sand) that uses organic polymer resin as the binder and quartz sand or other sand as aggregate has been widely used in the foundry industry due to its stable dimensional accuracy, high production efficiency, and good molding and core strength. . Especially in the casting production of the engine industry, the core part (such as the engine block or the cylinder head waterway sand core) is none other than it. [0003] In actual production practice, many casting defects have also occurred under relatively severe conditions (all surrounded by molten metal), such as sand sticking, sintering, veining, burrs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
Inventor 徐俊伟
Owner 徐俊伟
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