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Ceramic shell for single-crystal high-temperature alloy blade and preparation method of ceramic shell

A high-temperature alloy, ceramic type technology, applied in the field of investment casting, can solve the problems of increasing the amount of slurry and sand and prolonging the cycle of ceramic shells, and achieves the effect of reducing the amount of consumption, shortening the production cycle, and improving the ease of release.

Pending Publication Date: 2022-06-03
SHANGHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, as the number of layers of slurry coating increases, it will directly lead to the extension of the period for preparing the ceramic shell, and at the same time increase the amount of slurry and sand

Method used

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  • Ceramic shell for single-crystal high-temperature alloy blade and preparation method of ceramic shell
  • Ceramic shell for single-crystal high-temperature alloy blade and preparation method of ceramic shell
  • Ceramic shell for single-crystal high-temperature alloy blade and preparation method of ceramic shell

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preparation example Construction

[0035] The invention provides a preparation method of a ceramic shell for a single crystal superalloy blade, comprising the following steps:

[0036] (1) carry out surface layer slurry coating, sanding and drying on the outer surface of the wax mold to obtain the first composite structure after preparing the surface layer;

[0037] (2) on the outer surface of the first composite structure obtained in the step (1), the transition layer slurry coating, sanding and drying are performed to prepare the transition layer to obtain the second composite structure;

[0038] (3) on the outer surface of the second composite structure obtained in the step (2), carry out the back layer slurry coating, sanding and drying to prepare the first back layer to obtain the third composite structure;

[0039] (4) coating the outer surface of the third composite structure obtained in the step (3) with epoxy resin, and then wrapping a layer of carbon fiber tape on the outer surface of the epoxy resin ...

Embodiment 1

[0076] (1) Wax mold pretreatment: decontaminate the pressed wax mold and dry it for later use; the schematic diagram of the wax mold structure is shown in image 3 ,from image 3 It can be seen that the wax model includes five cylinders.

[0077] (2) Preparation of surface layer slurry: use silica sol and 320-mesh EC95 powder (EC95 powder is brown corundum sand made of 95% alumina and 5% silica fused and sintered) to prepare a slurry with a viscosity of 3.2mPa.s The surface layer slurry is ready for use;

[0078] (3) Preparation of surface layer: the surface layer slurry prepared in step (2) is used to coat and sand the surface layer slurry on the outer surface of the pressed wax mold, and then it is placed in the room to dry naturally for 12 hours to obtain the first composite structure. ; The sand in the sand is 70 mesh EC95 powder;

[0079] (4) Configure the transition layer slurry: use silica sol and 320 mesh EC95 powder to prepare a slurry with a viscosity of 3.1 mPa.s...

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Abstract

The invention relates to the technical field of investment casting, and provides a preparation method of a ceramic shell for a single-crystal high-temperature alloy blade, when the ceramic shell is prepared, after three layers are prepared, the surface of the ceramic shell is coated with epoxy resin, and then is wrapped with a layer of carbon fiber cloth tape, so that in the later roasting process, the surface of the ceramic shell is coated with a layer of carbon fiber cloth tape; the epoxy resin can generate residual carbon under the condition of relatively high temperature, and forms a C-C interconnected interwoven structure with good mechanical properties with the carbon fiber cloth, so that the strength of the shell is enhanced, and the number of layers of coated slurry is reduced; after the three-layer shell is prepared, carbon fiber cloth is wrapped, and the situation that the alloy performance is affected due to the fact that the carbon fiber cloth reacts with metal alloy liquid in the casting process is effectively avoided. According to the ceramic shell disclosed by the invention, the number of layers of coated slurry is reduced, so that the manufacturing period of the shell is shortened, and the use amount of the slurry and gravel is reduced.

Description

technical field [0001] The invention relates to the technical field of investment casting, in particular to a ceramic shell for a single crystal superalloy blade and a preparation method thereof. Background technique [0002] The ceramic shell is a necessary mold for the manufacture of superalloy blades, the core components of aero-engines. [0003] Investment casting is a common method for preparing ceramic shells, that is, coating slurry layer by layer on the wax mold, and making it with the sand-spraying process. The thickness of the ceramic shell is mainly determined by the number of layers in the preparation of the ceramic shell. In order to meet the requirements of the ceramic shell for single crystal superalloy blades, in the prior art, the thickness of the ceramic shell is usually increased by increasing the number of layers of slurry coated during the preparation of the ceramic shell. However, with the increase of the number of coating slurry layers, it will direc...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C9/22B22C1/00B22C1/10
CPCB22C9/043B22C9/22B22C1/00B22C1/10
Inventor 余建波张浩李霞张振强任忠鸣
Owner SHANGHAI UNIV
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