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Primary layer coating for manufacturing shell of precision casting and preparation method of primary layer coating

A technology for surface coatings and precision castings, applied in casting molding equipment, coatings, casting molds, etc., can solve the problem of poor compounding effect of defoaming agent or wetting agent and slurry, inability to obtain affinity and surface smoothness, Wax surface corrosion and other problems, to avoid wax corrosion, linear shrinkage stability, improve puncture resistance, and good surface quality

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 slurry is high (Tu-4 is greater than 45s), the composite effect of the defoamer or wetting agent and the slurry is poor, and the ideal affinity and compatibility cannot be obtained. surface finish, and when the amount of defoamer or wetting agent is too large, it will cause a certain degree of corrosion on the surface of the wax

Method used

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  • Primary layer coating for manufacturing shell of precision casting and preparation method of primary layer coating
  • Primary layer coating for manufacturing shell of precision casting and preparation method of primary layer coating
  • Primary layer coating for manufacturing shell of precision casting and preparation method of primary layer coating

Examples

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Effect test

Embodiment 1

[0036] A surface coating for shell making of precision castings, which is composed of the following raw materials by weight: 10 parts of silica sol, 40 parts of zircon powder, 0.015 parts of defoaming agent, and 0.04 part of wetting agent.

[0037] The preparation method is as follows:

[0038] 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.

[0039] When all the surface coatings are new materials, the stirring time is ≥24h, and for some new materials, the stirring time is ≥12h;

[0040] When the transition layer paint and the back layer paint are all new materials, the stirring time is ≥10h, and the stirring time of some new materials is ≥5h;

[0041] Less than 50% new material: stirring time 4-5h;

[0042] More than 50% new material: stirring time 6-12h;

[0043] More than 75% new material: stirr...

Embodiment 2

[0061] A surface coating for shell making of precision castings is characterized in that it consists of the following raw materials in weight ratios: 10 parts of silica sol, 38 parts of zircon powder, 0.015 parts of defoaming agent, and 0.04 part of wetting agent.

[0062] The preparation method is the same as in Example 1.

[0063] 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

[0065] A surface coating for shell making of precision castings is characterized in that it is composed of the following raw materials in parts by weight: 10 parts of silica sol, 42 parts of zircon powder, 0.015 parts of defoaming agent, and 0.04 part of wetting agent.

[0066] The preparation method is the same as in Example 1.

[0067] 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 primary layer coating for manufacturing a shell of a precision casting and a preparation method of the primary layer coating. The primary layer coating is prepared from the following raw materials in part by weight: 10 parts of silica sol, 38-42 parts of zircon powder, 0.04 part of wetting agents and 0.015 part of defoamer. The flow cup viscosity value of the primary layer coating is 48-57s. The quality of a prepared shell is stable, the surface of the shell is compact, high-temperature strength is good, the dimensional accuracy of the casting is high, and the 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 increased, and a primary layer has good breathability.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and in particular relates to a surface coating 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 factors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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