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Transition layer coating for manufacturing shell of precision casting and preparation method of transition layer coating

A technology of precision casting and transition layer, used in casting molding equipment, coating, casting mold, etc., can solve the surface corrosion of wax parts, unable to obtain ideal affinity and surface finish, defoamer or wetting agent and slurry It can solve the problems of poor composite effect and other problems, so as to achieve the effect of good surface quality, linear shrinkage stability and puncture resistance improvement, and to avoid the corrosion of wax parts.

Active Publication Date: 2015-12-02
GAOMI YONGHE PRECISE CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the preparation process of the existing silica sol shell, when the viscosity of the transition layer slurry is small (Tu-4 is less than 10s), the composite effect of the defoamer or wetting agent and the slurry is poor, and the ideal affinity cannot be obtained. and surface finish, and when the amount of defoaming agent or wetting agent is too large, it will cause a certain degree of corrosion on the surface of wax parts

Method used

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  • Transition layer coating for manufacturing shell of precision casting and preparation method of transition layer coating
  • Transition layer coating for manufacturing shell of precision casting and preparation method of transition layer coating
  • Transition layer coating for manufacturing shell of precision casting and preparation method of transition layer coating

Examples

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Effect test

Embodiment 1

[0037] A transition layer paint for shell making of precision castings, which is composed of the following raw materials in the following weight ratios: 10 parts of silica sol, 18 parts of zircon powder, 0.015 parts of defoaming agent, and 0.04 part of wetting agent.

[0038] The preparation method is as follows:

[0039] The transition layer is coated on the surface of the shell membrane coated with the surface layer, and the specific steps are as follows:

[0040] The room temperature is 22-27°C. When the temperature exceeds 27°C, it will cause cracks in the shell mold, dry transition and other undesirable phenomena, and iron fins, flashes, and shell swelling will appear in the casting.

[0041] When the transition layer coating is all new materials, the stirring time is ≥ 24 hours, and the stirring time of some new materials is ≥ 12 hours;

[0042] When the transition layer paint and the back layer paint are all new materials, the stirring time is ≥10h, and the stirring ti...

Embodiment 2

[0063] A transition layer coating for shell making of precision castings is characterized in that it is composed of the following raw materials in weight ratios: 10 parts of silica sol, 20 parts of zircon powder, 0.015 parts of defoaming agent, and 0.04 part of wetting agent.

[0064] The preparation method is the same as in Example 1.

[0065] The prepared product can avoid shrinkage cavity or shrinkage porosity defects, has high surface finish, excellent linear shrinkage stability and puncture resistance of the shell film of the product, and the product quality can reach the product quality standard of precision casting.

Embodiment 3

[0067] A transition layer coating for shell making of precision castings is characterized in that it is composed of the following raw materials in weight ratios: 10 parts of silica sol, 16 parts of zircon powder, 0.015 parts of defoaming agent, and 0.04 part of wetting agent.

[0068] The preparation method is the same as in Example 1.

[0069] The prepared product can avoid shrinkage cavity or shrinkage porosity defects, has high surface finish, excellent linear shrinkage stability and puncture resistance of the shell film of the product, and the product quality can reach the product quality standard of precision casting.

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Abstract

The invention relates to a transition layer coating for manufacturing a shell of a precision casting and a preparation method of the transition layer coating. The transition layer coating for manufacturing the shell of the precision casting consists of the following raw materials in part by weight: 10 parts of silica sol, 16-20 parts of zircon powder, 0.015-0.02 part of defoamer and 0.04-0.045 part of wetting agents. The flow cup viscosity value of the transition layer coating is 7-9s. The quality of the prepared shell is stable, the surface of the shell is compact, high-temperature strength is high, the dimensional accuracy of the casting is high, and surface quality of a product is good. Shelling property and fire resistance are good, and the shell is good in thermal conductivity, low in thermal expansion and excellent in thermal vibration stability. Moreover, the adding amount of the wetting agents and the adding amount of the defoamer are improved, and a transition layer has good breathability.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and in particular relates to a transition layer paint for shell making of precision castings and a preparation method thereof. Background technique [0002] The products obtained by investment precision casting are precise and complex, close to the final shape of the parts, and can be used directly without or with little processing. It is an advanced technology near net shape and an excellent technology in the foundry industry. The application is very extensive. It is not only suitable for casting of various types and alloys, but also produces castings with higher dimensional accuracy and surface quality than other casting methods, and even complex, high temperature resistant and difficult to process castings that are difficult to cast by other casting methods. All can be cast by investment casting. [0003] In the precision casting process, the mold shell is one of the most critical ...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 邹森赵凤森于杰赵凤启
Owner GAOMI YONGHE PRECISE CASTING
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