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Preparation method of shell mold for investment casting of TiAl based alloy

An investment casting and base alloy technology, which is applied in casting molding equipment, metal processing equipment, casting molds, etc., can solve the problems of poor room temperature plasticity of TiAl-based alloys, laborious and waste forging, and elongation of less than 1%. Good thermal stability and chemical stability, easy production, good thermal conductivity

Inactive Publication Date: 2013-12-04
锆坦生物技术(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because TiAl-based alloys have poor room temperature plasticity and obvious room temperature brittleness, their elongation during stretching is less than 1%, and the grains will grow sharply during hot working, resulting in further embrittlement, so the machinability is very poor. making it difficult to apply
[0004] In view of the characteristics of TiAl-based alloys, forging is obviously laborious and wasteful, especially when making parts with complex shapes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) ZrO with a particle size of 325 mesh at room temperature 2 Prepare a slurry with zirconium sol according to the powder-liquid ratio of 3:1 (g / ml), then add n-octanol and defoamer, the weight percentages of the two additives are 3‰ and 5‰ respectively, that is, in ZrO was added during stirring 2 Powder, n-octanol, defoamer (commercialized), then stirred for 1.5 hours and left to stand for 24 hours. At this time, the viscosity of the slurry was a flow cup viscosity of 49 seconds.

[0025] 2) Immerse the wax pattern in the paint for 8 seconds and turn it slightly to make the slurry completely cover the wax pattern. Take out the wax pattern and leave it empty for 5 seconds to let the excess slurry flow away and ensure that the remaining slurry on the wax pattern is evenly covered Wax model, dusting particle size is 120 mesh ZrO 2 Sand is used as the surface layer, and then placed in a non-circulating environment with a temperature of 25°C and a humidity of 65% for 12 h...

Embodiment 2

[0030] 3) the particle size is 400 mesh ZrO 2 Prepare a slurry with zirconium sol according to the powder-liquid ratio of 2.8:1 (g / ml), then add n-octanol and defoamer, the weight percentages of the two additives are respectively 1‰ and 3‰, stir in the zirconium sol Add ZrO in the process 2 Powder, n-octanol, defoamer, then stirred for 1 hour, and left to stand for 24 hours. At this time, the viscosity of the slurry was a flow cup viscosity of 58 seconds.

[0031] 4) Immerse the wax pattern in the paint for 8 seconds and turn it slightly to make the slurry completely cover the wax pattern. Take out the wax pattern and leave it empty for 5 seconds to let the excess slurry flow away and ensure that the remaining slurry on the wax pattern is evenly covered Wax model, dusting particle size is 100 mesh ZrO 2 Sand is used as the surface layer, and then placed in a non-circulating environment with a temperature of 28°C and a humidity of 70% for 12 hours. Calcined fused Al with a p...

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Abstract

The invention relates to a preparation method of a shell mold for investment casting of a TiAl based alloy, and belongs to the technical field of precision casting. The preparation method comprises the following steps that: firstly, ZrO2 and zirconia sol are prepared into a slurry; after the slurry is coated with a wax pattern, ZrO2 sand with a particle degree of 120 to 180 meshes is spread; Al2O3 and ethyl silicate hydrolyzate are prepared into a slurry, and then after the slurry is coated with a mold shell, Al2O3 sand with a particle degree of 60 to 90 meshes is spread, the slurry coating and the sand spreading are repeated for several times, the sand is Al2O3 sand with the particle degree of 40 to 50, 20 to 30, and 6 to 10 meshes sequentially, and drying is carried out; and dewaxing and roasting are carried out. The preparation method has the advantages that: the strength of the mold shell is sufficient, the production cycle is short, the quality of the inner surface of the mold shell is good, the reaction between TiAl based alloy castings and the mold shell is small after casting, and the castings have high surface quality.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and in particular relates to a preparation method of a TiAl-based alloy shell mold for investment casting. Background technique [0002] TiAl-based alloy has the advantages of high strength, low density, high elastic modulus, good oxidation resistance and creep performance, and is a kind of light-weight high-temperature structural material with great potential. It is a rapid development in the field of titanium casting in recent years. A class of alloys [E.A.Loria.Quo vadis gamma titanium aluminumide.Intermetallics.2001.9:997-1001]. TiAl-based alloys are expected to be used in jet engines and turbines and other aerospace and high-temperature-resistant parts of the automotive industry, as well as wings and shells of ultra-high-speed aircraft, and are considered to be a new generation of lightweight high-temperature-resistant structural materials with the most application potential [Li Ji...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04
Inventor 陈子勇肖连博相志磊聂祚仁
Owner 锆坦生物技术(北京)有限公司
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