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TiAl alloy powder near-net-shaping method

A technology of alloy powder and near-net shape, which is applied in the field of powder metallurgy. It can solve the problems of coarse grains in the as-cast structure, low ductility at room temperature, and difficulty in forging and forming, and achieve the effect of easy peeling, low cost, and easy demoulding.

Active Publication Date: 2015-04-15
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluidity of the TiAl alloy molten liquid is poor, and the traditional casting process has a large number of pores and porosity in the casting, and the as-cast structure has coarse grains, and the room temperature ductility of the product after casting is low, and the practical application is limited.
While forging can improve the structure and properties very well, but for some components with complex structures, it is also difficult to use forging to form

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Select a round bar with a diameter of 15mm and a length of 80mm as the preformed component for hot isostatic pressing of ceramic molds. The implementation steps are as follows:

[0017] 1. Prepare a round rod wax model; uniformly mix alumina powder, silicon dioxide and titanium dioxide powder with a mass percentage of 68%, 30% and 2% respectively, and then add silica sol according to the mass percentage of powder and liquid at 2:1. Stir evenly to prepare a coating; apply the prepared coating evenly on the surface of the wax mold and dry for 2 hours; repeat the coating and drying steps 6 times, dewax after drying for 24 hours, sinter at 1100 ° C, and obtain a ceramic mold after cooling ;

[0018] 2. Use low-carbon steel to prepare a metal sheath with a thickness of 3mm, a diameter of 50mm, and a height of 120mm;

[0019] 3. Fill the titanium-aluminum alloy powder with an average particle size of 20 microns into the ceramic mold and vibrate it, then put the ceramic mold ...

Embodiment 2

[0024] Select a round bar with a diameter of 15mm and a length of 80mm as the preformed component for hot isostatic pressing of ceramic molds. The implementation steps are as follows:

[0025] 1. Prepare a round rod wax model; mix 70% and 30% yttrium oxide powder and zirconia powder evenly, then add yttrium sol according to the mass percentage of powder and liquid at 2:1, and stir evenly to prepare a coating; Apply the prepared paint evenly on the surface of the wax mold and dry for 2 hours; repeat the coating and drying steps 6 times, and dry for 24 hours before dewaxing, sintering at 1450°C, and obtain a ceramic mold after cooling;

[0026] 2. Use 304 stainless steel to prepare a metal sheath with a thickness of 3mm, a diameter of 50mm, and a height of 120mm;

[0027] 3. Fill the TiAl alloy powder with an average particle size of 200 microns into the ceramic mold and vibrate it, then put the ceramic mold filled with steel powder into the middle of the stainless steel sheath,...

Embodiment 3

[0032] Select a round bar with a diameter of 15mm and a length of 80mm as the preformed component for hot isostatic pressing of ceramic molds. The implementation steps are as follows:

[0033] 1. Prepare a round rod wax model; uniformly mix zirconia powder and titanium dioxide powder with mass percentages of 95% and 5% respectively, then add zirconium sol according to the mass percentage of powder liquid at 2:1, and stir evenly to prepare a coating; The prepared coating is evenly coated on the surface of the wax mold, and dried for 2 hours; the coating and drying steps are repeated 6 times, after drying for 24 hours, dewaxing, sintering at 1500 ° C, and cooling to obtain a ceramic mold;

[0034] 2. Use 304 stainless steel to prepare a metal sheath with a thickness of 3mm, a diameter of 50mm, and a height of 120mm;

[0035] 3. Fill the titanium-aluminum alloy powder with an average particle size of 100 microns into the ceramic mold and vibrate it, then put the ceramic mold fill...

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Abstract

The invention relates to a TiAl alloy powder near-net-shaping method which is particularly suitable for shaping of TiAl alloy powder. According to the method, a wax mold for preparing a required shaping component is prepared first, paint is prepared through binder and oxide ceramic powder, the surface of the wax mold is coated with the paint, and a ceramic mold with certain thickness, strength and high temperature plasticity is obtained after the wax mold is dryed, dewaxed and sintered; the TiAl alloy powder is filled into the ceramic mold to be compacted, the ceramic mold is then placed into a metal sheath, metallic oxide sand is filled between the metal sheath and the ceramic mold, the metal sheath is vacuumized and welded in a sealed mode, finally, the metal sheath undergoes hot isostatic pressing, the ceramic mold plastically deforms and contracts under the action of high temperature and high pressure, and thus the TiAl alloy powder is compressed and compacted to shape the component with the required shape. The TiAl alloy powder near-net-shaping method can be used for near-net-shaping of complex structural components, the texture is fine and uniform, metallurgical defects do not occur, shaping temperature is low, and interface reactions between the metal and the ceramic mold are avoided.

Description

technical field [0001] The invention relates to a method for near net shaping of TiAl alloy powder, which belongs to the field of powder metallurgy. Background technique [0002] TiAl alloy has the characteristics of low density, good high-temperature mechanical properties and strong high-temperature oxidation resistance. The service temperature can reach above 860 ° C, and it is an excellent structural material. However, the bottleneck hindering its large-scale application lies in its room temperature plasticity and difficult processing. The fluidity of TiAl alloy molten liquid is poor. The traditional casting process has a large number of pores and porosity in the casting, and the as-cast structure has coarse grains. The room temperature ductility of the cast product is low, and the practical application is limited. Forging can improve the structure and performance, but for some complex structural components, it is difficult to use forging to form. The powder metallurgy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16
Inventor 朱郎平李建崇南海黄东赵嘉琪
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS