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Preparation method for precision casting of mold shell through directional solidification investment casting of titanium-aluminum based alloy

An investment precision casting and directional solidification technology, which is applied in casting molding equipment, metal processing equipment, casting molds, etc., can solve the problems of deteriorating casting quality and affecting the mechanical properties of castings, and achieve long-term preservation, stable size, and stable performance Effect

Inactive Publication Date: 2014-01-29
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The titanium-aluminum-based alloy melt is easy to react with the mold shell material, forming a contamination layer on the surface of the casting, deteriorating the quality of the casting, and affecting the mechanical properties of the casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The implementation steps of the preparation method of the titanium-aluminum-based alloy directional solidification investment casting mold shell are as follows:

[0033] ⑴ Slurry preparation for isolation layer

[0034] Mix the titanium boride powder and the yttrium sol with a particle size of 200 mesh, stir evenly, and set aside, the weight ratio of the powder to the yttrium sol is 3:1, and the flow cup viscosity of the isolation layer slurry is 98s;

[0035] ⑵Back layer slurry preparation

[0036] Mix the zirconia powder with a powder size of 200 mesh and the zirconium sol at a weight ratio of 2:1, stir evenly, and set aside, the flow cup viscosity of the back layer slurry is 78s;

[0037] ⑶ Formwork isolation layer preparation

[0038] Apply the prepared isolation layer slurry on the wax mold, then evenly spread the yttrium oxide sand with a particle size of 30 mesh, dry it for 12 hours at 20°C and a humidity of 30%, repeat the above coating, hanging, and laying S...

Embodiment 2

[0044] The implementation steps of the preparation method of the titanium-aluminum-based alloy directional solidification investment casting mold shell are as follows:

[0045] ⑴ Slurry preparation for isolation layer

[0046] Mix the titanium boride powder and the yttrium sol with a particle size of 325 mesh, stir evenly, and set aside, the weight ratio of the powder to the yttrium sol is 5:1, and the flow cup viscosity of the isolation layer slurry is 55s;

[0047] ⑵Back layer slurry preparation

[0048] Mix the zirconia powder with a particle size of 325 mesh and the zirconium sol at a weight ratio of 4:1, stir evenly, and set aside, the flow cup viscosity of the back layer slurry is 42s;

[0049] ⑶ Formwork isolation layer preparation

[0050] Apply the prepared isolation layer slurry on the wax mold, then evenly spread the yttrium oxide sand with a particle size of 100 mesh, dry for 20 hours at 23°C and a humidity of 60%, repeat the above coating, hanging and laying Sp...

Embodiment 3

[0056] The implementation steps of the preparation method of the titanium-aluminum-based alloy directional solidification investment casting mold shell are as follows:

[0057] ⑴ Slurry preparation for isolation layer

[0058] Mix the titanium boride powder and the yttrium sol with a particle size of 500 mesh, stir evenly, and set aside, the weight ratio of the powder to the yttrium sol is 8:1, and the flow cup viscosity of the isolation layer slurry is 34s;

[0059] ⑵Back layer slurry preparation

[0060] Mix the zirconia powder with a powder size of 500 mesh and the zirconium sol at a weight ratio of 6:1, stir evenly, and set aside, the flow cup viscosity of the back layer slurry is 23s;

[0061] ⑶ Formwork isolation layer preparation

[0062] Apply the prepared isolation layer slurry on the wax mold, then evenly spread the yttrium oxide sand with a particle size of 150 mesh, dry for 36 hours at 25°C and a humidity of 90%, repeat the above coating, hanging and laying Spri...

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Abstract

The invention discloses a preparation method for precision casting of a mold shell through directional solidification investment casting of a titanium-aluminum based alloy. According to the preparation method, the mold shell is prepared from an isolating layer slurry by taking yttrium sol as a binding agent and titanium boride, zirconium boride, high-purity tungsten powder and the like as fillers through wax pattern preparation, coating hanging, wax pattern removal and high-temperature sintering. A mold shell system disclosed by the invention has the characteristics that the slurry performance is stable, the coating performance is good, storage is easy, and the mold shell has good high temperature resistance and thermal shock resistance and high chemical stability, and the like; a prepared cast has the characteristics of thin surface pollution layer, high dimensional accuracy and the like. The mold shell is suitable for development and production of turbine blades with directional solidification structures.

Description

technical field [0001] The invention relates to a method for preparing a titanium-aluminum-based alloy directional solidification investment casting mold shell, which belongs to the technical field of investment precision casting mold shell preparation. Background technique [0002] Titanium-aluminum-based alloy is an excellent structural material, which has the characteristics of low density, high specific strength, good corrosion resistance, good creep resistance and oxidation resistance, and is widely used in the aerospace field. However, the bottleneck hindering its large-scale application lies in its room temperature plasticity and difficult processing. [0003] As a technology that can produce complex shape and near-net-shape structural parts, investment investment casting is suitable for mass production, no machining allowance and complex components that are difficult to machine. [0004] Directional solidification is to use the control of the direction of heat condu...

Claims

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Application Information

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IPC IPC(8): B22C9/04
Inventor 李建崇朱郎平南海赵嘉琪黄东
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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