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Method for preparing TiAl-based alloy formwork by wax mold casting

A technology of investment casting and base alloy, which is applied in casting molding equipment, metal processing equipment, casting molds, etc., can solve the problems of reduced processing and service performance, high price, and alloy oxygenation, etc., and achieves compact structure, low cost, Use the effect of excellent performance

Active Publication Date: 2011-07-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ThO in surface material 2 Least reactive with molten titanium, but less used due to its radioactivity; Y 2 o 3 It is also difficult to react with TiAl alloy, but it is expensive, other Al 2 o 3 , ZrO 2 It is easy to chemically react with molten TiAl to increase oxygen in the alloy and reduce its processing and service performance

Method used

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  • Method for preparing TiAl-based alloy formwork by wax mold casting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Set the particle size to 200 mesh Y 2 o 3 The powder and silica sol are configured in a weight ratio of 3:1, adding a wetting agent and a defoamer, wherein the wetting agent accounts for 3% by weight of the slurry, and the defoamer accounts for 3% by weight of the slurry. Add Y while stirring 2 o 3 powder, then add wetting agent and defoamer in turn, stir for 10 hours, and make a slurry with flow cup viscosity of 16 seconds; in this embodiment, the wetting agent is polyoxyethylene alkylphenol ether, and the defoamer is isopropanol.

[0027] 2) Dip the wax mold set into the above Y 2 o 3 Put in the slurry for 6 seconds to ensure that the slurry hangs evenly on the wax model, and the sanding particle size is 80 mesh electrofusion Y 2 o 3 Sand is dried for 8 hours in an environment with a temperature of 21°C and a humidity of 50% to form a surface layer; 320 mesh Al 2 o 3 The powder and silica sol are configured into a slurry with a flow cup viscosity of 18 sec...

Embodiment 2

[0031] 1) The particle size is 320 mesh Y 2 o 3The powder and silica sol are configured in a weight ratio of 2.5:1, adding a wetting agent and a defoamer, wherein the wetting agent accounts for 2% by weight of the slurry, and the defoamer accounts for 3% by weight of the slurry. Add Y while stirring 2 o 3 powder, then add wetting agent and defoamer in turn, stir for 10 hours, and make a slurry with flow cup viscosity of 13 seconds; in this embodiment, the wetting agent is low foam wetting and dispersing agent RFCF-10, and the defoaming The agent is silicone resin.

[0032] 2) Dip the wax mold set into the above Y 2 o 3 Put in the slurry for 6 seconds to ensure that the slurry hangs evenly on the wax model, and the sanding particle size is 100 mesh electrofusion Y 2 o 3 Sand is dried for 8 hours in an environment with a temperature of 25°C and a humidity of 40% to form a surface layer; 320 mesh Al 2 o 3 The powder and silica sol are configured into a slurry with a flow...

Embodiment 3

[0035] 1) The particle size is 270 mesh Y 2 o 3 The powder and silica sol are configured in a weight ratio of 2:1, adding a wetting agent and a defoamer, wherein the wetting agent accounts for 1% by weight of the slurry, and the defoamer accounts for 5% by weight of the slurry. Add Y while stirring 2 o 3 powder, then add wetting agent and defoamer in turn, stir for 10 hours, and make a slurry with flow cup viscosity of 18 seconds; in this embodiment, the wetting agent is octylphenol polyoxyethylene ether, and the defoamer is Zhengxuan alcohol.

[0036] 2) Dip the wax mold set into the above Y 2 o 3 Put in the slurry for 8 seconds to ensure that the slurry hangs evenly on the wax model, and the sanding particle size is 40 mesh electrofusion Y 2 o 3 Sand is dried for 8 hours in an environment with a temperature of 23°C and a humidity of 30% to form a surface layer; 270 mesh Al 2 o 3 The powder and silica sol are configured into a slurry with a flow cup viscosity of 22 s...

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Abstract

The invention relates to the field of precision casting, in particular to a method for preparing a shuttering for an investment casting TiAl-based alloy with low cost and strong stability. The method comprises the following steps: preparing slurry of which flow cup viscosity is 10 to 25 seconds from Y2O3 powder of 200 to 400 meshes on granularity and silica sol according to a weight ratio of 2:1-3:1; then, coating the slurry on a wax mould, sprinkling electric melting Y2O3 sand of which sand granularity is 40 to 100 meshes on the wax mould, and drying the wax mould; preparing slurry of which flow cup viscosity is 10 to 30 seconds by adopting Al2O3 powder of 200 to 400 meshes on granularity and silica sol according to a weight ratio of 3:1-4:1, coating the second layer, sprinkling electric melting Al2O3 sand of which sand granularity is 40 to 80 meshes on the wax mould, and drying the wax mould; preparing slurry by adopting bauxite and silica sol according to a weight ratio of 3:1-4:1,and sprinkling coal gangue sand of which sand granularity is 16 to 24 meshes on the wax mould; after three layers, finally hanging the bauxite slurry, and drying the slurry; and then removing wax, and sintering the mould. The method has the advantages of simple shuttering preparation process and low cost of the shuttering, can effectively control reaction of a TiAl-based alloy cast and a shuttering surface material, reduce oxygen feeding amount of the alloy, and is suitable for casting a TiAl-based alloy cast.

Description

technical field [0001] The invention relates to the field of precision casting, in particular to a low-cost and highly stable mold shell preparation method for investment casting TiAl-based alloys. Background technique [0002] Improving the thrust of the aero-engine, reducing the weight of the engine, and saving fuel have become an important direction in the design of aero-engine materials; and an important issue facing the modern automobile industry is the high fuel consumption caused by the incomplete combustion of gasoline and the exhaust gas emitted by automobiles. The way to solve the problem of pollution caused by this problem is to improve the combustion efficiency of fuel, and the lightweight and high wear resistance of component materials are one of the effective means for fuel to improve combustion efficiency. Therefore, as materials for aviation, spacecraft engines and automotive engine components, they should have the four characteristics of "lighter, stronger, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04
Inventor 马颖澈刘奎陈波李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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