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Preparation method of tungsten-containing high-inertia shell through TiAl alloy investment casting

A technology of investment precision casting and inert type, which is applied in the direction of casting molding equipment, casting molds, casting mold components, etc., and can solve serious problems, such as sticky sand layer thick interface reaction on the casting surface, high cost, etc.

Inactive Publication Date: 2015-12-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high cost of the existing TiAl alloy investment casting ceramic mold shell, thick sand layer on the surface of the casting and serious interface reaction, and provide a TiAl alloy investment casting containing tungsten with high inertness The method of preparing the shell

Method used

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  • Preparation method of tungsten-containing high-inertia shell through TiAl alloy investment casting
  • Preparation method of tungsten-containing high-inertia shell through TiAl alloy investment casting
  • Preparation method of tungsten-containing high-inertia shell through TiAl alloy investment casting

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specific Embodiment approach 1

[0024] Specific implementation mode 1: The preparation method of a tungsten-containing TiAl alloy investment casting high inert mold shell of this embodiment is carried out according to the following steps:

[0025] 1. Preparation of surface layer slurry: Add defoamer and wetting agent to the ammonium tungstate sol under the condition of stirring speed of 20r / min~40r / min to obtain a mixed solution, and then add at a speed of 200g / min ~300g / min Add Al to the mixed solution 2 O 3 Powder, stir and mix to Al under the condition of stirring speed of 20r / min~40r / min 2 O 3 The powder is uniformly dispersed in the mixed liquid, and then stirred at a stirring speed of 80r / min-100r / min for 22h-24h, and then left for 8h-12h to obtain the surface layer slurry;

[0026] The Al 2 O 3 The mass ratio of the powder to the ammonium tungstate sol is (2.5~3):1; the mass ratio of the ammonium tungstate sol to the antifoaming agent is 100: (0.05~0.2); the ammonium tungstate sol and the lubricant The mas...

specific Embodiment approach 2

[0037] Specific embodiment two: this embodiment is different from specific embodiment one in that: the Al described in step one 2 O 3 The particle size of the powder is 320 mesh. The other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0038] Specific embodiment three: this embodiment is different from specific embodiment one or two in that: the Al described in step one 2 O 3 The mass ratio of powder to ammonium tungstate sol is 2.6:1. The other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a tungsten-containing high-inertia shell through TiAl alloy investment casting and aims to solve the problems of high cost, thicker burnt-on sand layer on the casting surface and a serious interface reaction of an existing TiAl alloy investment cast ceramic shell. The method comprises steps as follows: step one, preparation of surface slurry; step two, preparation of a surface shell; step three, preparation of a back shell; step four, slurry sealing; step five, dewaxing and roasting. According to the method, low-cost Al2O3 powder is added to ammonium tungstate sol, a high-inertia refractory material is generated with a certain roasting technology, the degree of a TiAl alloy investment casting interface reaction is remarkably reduced, and the cost for TiAl alloy investment casting is reduced, and the interface reaction is reduced. The shell has a smooth casting surface, burnt-on sand is remarkably reduced, the thickness of an interface reaction layer is about 20 mu m, and compared with a conventional shell, the shell is greatly improved.

Description

Technical field [0001] The invention relates to a method for preparing a TiAl alloy investment casting mold shell. Background technique [0002] TiAl alloy has broad application prospects in aerospace and industrial fields due to its low density, high specific strength, high temperature creep resistance and oxidation resistance. The preparation of TiAl alloy by investment precision casting has unparalleled advantages in other processes, especially in the production of thin-walled components with complex shapes. This method can achieve near-net-shape forming and obtain precision components with no or nearly no margins, which greatly reduces Loss, improve material utilization. [0003] Because the molten TiAl alloy has high chemical activity, it can react with almost all refractory materials to form a pollution layer on the surface of the component, deteriorate the internal and external quality of the component, affect the dimensional accuracy of the component, and even cause the co...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C3/00
Inventor 陈玉勇贾燚肖树龙徐丽娟田竟曹守臻韩建超
Owner HARBIN INST OF TECH
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