Ceramic shell material for precision casting of superalloy castings and preparation method of ceramic shell material

A technology of precision casting and high-temperature alloys, which is applied in casting molding equipment, casting molds, casting mold components, etc. to achieve the effects of inhibiting cracking, increasing suspension stability, and reducing the number of times of back coating.

Inactive Publication Date: 2021-03-05
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology fails to achieve a comprehensive improvement of the wet strength, high temperature strength, residual strength, and air permeability, yield and collapse of the shell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment realizes the preparation of the ceramic shell material for precision casting of superalloy castings through the following steps:

[0020] 1. Preparation of shell surface coating: put 20kg of alkaline silica sol in the mixing bucket and stir, add 75kg of zircon powder and 3kg of cobalt aluminate into the mixing bucket in batches, and add to the mixing bucket under the condition of stirring. Add 1 kg of polyvinyl acetate emulsion into the mixing tank, stir for 1 hour, then slowly add 0.25 kg each of wetting agent, defoamer, dispersant and preservative, and continue stirring for 1 hour to obtain the surface coating.

[0021] 2. Preparation of shell back coating: put 30kg of alkaline silica sol in the mixing bucket and stir, add 65kg of sintered mullite powder, 1kg of lignocellulose, 1kg of kaolin, and 1kg of potassium titanate whiskers in batches Add 1 kg of polyvinyl acetate emulsion to the mixing tank under stirring conditions, stir for 1 hour, then slowl...

Embodiment 2

[0025] In this embodiment, the preparation of the ceramic mold shell material for precision casting of superalloy castings is realized through the following steps. Compared with Example 1, the adjustment of this embodiment is: the composition of the mold shell surface layer and the back layer material is changed.

[0026] This embodiment specifically includes the following steps:

[0027] 1. Preparation of shell surface coating: put 25kg of alkaline silica sol in the mixing bucket and stir, add 68kg of zircon powder and 4kg of cobalt aluminate into the mixing bucket in batches, and add to the mixing bucket under the condition of stirring. Add 2kg of polyvinyl acetate emulsion into the mixing tank, stir for 1 hour, then slowly add 0.25kg each of wetting agent, defoamer, dispersant and preservative, and continue stirring for 1 hour to obtain the surface coating.

[0028] 2. Preparation of shell back coating: put 35kg of alkaline silica sol in the slurry mixing tank and stir, add...

Embodiment 3

[0032] In this embodiment, the preparation of the ceramic mold shell material for precision casting of superalloy castings is realized through the following steps. Compared with Example 1, the adjustment of this embodiment is: the composition of the mold shell surface layer and the back layer material is changed.

[0033] This embodiment specifically includes the following steps:

[0034] 1. Preparation of shell surface coating: put 30kg of alkaline silica sol in the mixing bucket and stir, add 60kg of fused corundum powder and 5kg of cobalt aluminate into the mixing bucket in batches, under stirring conditions, Add 4kg of polyvinyl acetate emulsion into the mixing tank, stir for 1 hour, then slowly add 0.25kg of wetting agent, defoamer, dispersant and preservative, and continue stirring for 1 hour to obtain the surface coating.

[0035] 2. Preparation of shell back coating: put 40kg of alkaline silica sol in the slurry mixing tank and stir, add 47kg of sintered mullite powder, ...

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Abstract

The invention discloses a ceramic shell material for precision casting of superalloy castings and a preparation method of the ceramic shell material. A clean and dry blade wax pattern module is immersed into a surface layer coating; after the coating is uniformly coated on the surface of a wax pattern, zircon sand or fused corundum sand serving as fire resistant filler is uniformly spread; dryingis performed at room temperature; then, after a back layer coating of the module is stained with slurry, sintered mullite sand serving as fire resistant filler is uniformly spread and fully dried; theback layer coating is repeatedly stained with the slurry until a required thickness of a shell is achieved; then the back layer coating is used for slurry sealing and drying; the dried shell is dewaxed in a high-pressure steam dewaxing kettle; roasting is performed in air at 850-1100 DEG C for 2-6 hours; and the ceramic shell is obtained after air cooling to the room temperature. The shell manufactured according to the preparation method has high wet strength, high-temperature strength, low residual strength, excellent air permeability, excellent deformability, and excellent collapsibility. Compared with a common shell, the shell is decreased in coating frequency of back layers and reduced in thickness. The increase in heat dissipation rate during casting solidification cooling is facilitated, and the metallurgical quality of the castings is improved.

Description

technical field [0001] The invention relates to a technique in the field of investment casting, in particular to a ceramic mold shell material for precision casting of high-temperature alloy castings and a preparation method thereof. Background technique [0002] The preparation of ceramic shells is one of the main processes in the investment casting process, and the properties of the shells have an important impact on the metallurgical quality, surface quality and dimensional accuracy of castings. Wet strength, high temperature strength and residual strength after pouring are the main technical indicators for evaluating the performance of the shell. For superalloy castings with complex and thin-walled structures, the strength of the shell is required to have high wet strength, high temperature strength and low residual strength, which can ensure that the shell will not be damaged during dewaxing and molten metal pouring. The occurrence of cracks can also ensure that the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C3/00B22C1/02B22C1/10
CPCB22C1/02B22C1/10B22C3/00B22C9/043
Inventor 江毅李飞孙宝德张海龙赵辉雷四雄易出山
Owner SHANGHAI JIAO TONG UNIV
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