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Fine-grain titanium aluminum powder forming method

A molding method and powder technology, which is applied in the field of titanium-aluminum intermetallic compounds and materials, can solve problems such as cold isostatic pressing of pre-alloyed titanium-aluminum powder, achieve short production cycles, facilitate engineering applications, and reduce costs Effect

Inactive Publication Date: 2017-10-24
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

[0004] An improved preparation method of fine-grained titanium-aluminum alloy is provided to realize the uniform preparation of elemental titanium-aluminum powder, reduce the oxygen content in the powder mixing process, and solve the problems of difficult cold isostatic pressing of pre-alloyed titanium-aluminum powder. The internal metallurgical quality and dimensional deviation control of titanium-aluminum alloy powder can finally achieve the purpose of improving the performance of titanium-aluminum alloy and reducing production costs

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  • Fine-grain titanium aluminum powder forming method
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  • Fine-grain titanium aluminum powder forming method

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preparation example Construction

[0034] (1) Preparation of titanium-aluminum alloy powder, the preparation method is one of the following:

[0035] Method 1 Weigh each component according to the ratio of titanium-aluminum alloy components, the atomic ratio is Al:Nb:Cr=48:2:2, and the balance is Ti, record the weighed components as raw materials, and divide the raw materials 1. Put the stainless steel balls into the mixing tank, seal the mixing tank and mix on the tumbling machine. The rotation frequency of the mixer is 27HZ, and the mixing time is 5-10h. Powder and steel balls are separated to obtain uniform titanium-aluminum mixed powder. The mass ratio of raw materials and steel balls is 10-40:1-3;

[0036] Method 2 selects spherical gas-atomized titanium-aluminum powder as the raw material, and the composition ratio of the gas-atomized titanium-aluminum powder is the same as method 1. Put the raw material and stainless steel balls into the ball milling tank respectively, seal the ball milling tank and carr...

Embodiment 1

[0048] The steps and technological process of this embodiment are as follows:

[0049] Mix powder. Original hydrodehydrogenation Ti powder (purity > 99%), Al powder (purity > 99%), Al-Nb powder (purity > 99%), Cr powder (purity > 99%) according to the atomic ratio of 48:48:2 :2 for proportioning, the original powder and stainless steel balls are put into the mixer for mixing, wherein the diameter of the stainless steel balls is and The two are mixed, the rotation frequency of the mixer is set at 27HZ, and the mixing time is 8h, and then the mixed titanium-aluminum powder and steel balls are separated by a screen to obtain uniformly mixed titanium-aluminum powder.

[0050] Powdered. Please refer to Figure 4 and Figure 5 1. Fill the mixed rhombic TiAl powder in the cavity 3 of the rubber sheath 1, and the powder particles need to be shaken and vibrated continuously during the powder filling process. The rubber sheath 1 used in this embodiment is a barrel-shaped sheath ...

Embodiment 2

[0054] The steps and technological process of this embodiment are as follows:

[0055] Milling. Original gas-atomized spherical titanium-aluminum powder (purity > 99.99%), put the raw material and stainless steel balls into the ball milling pot respectively, seal the ball milling pot and carry out dry ball milling, the rotating speed of the ball milling pot is 350r / min, and the ball milling time is set Set as 3.5h, the diamond-shaped titanium-aluminum powder after ball milling was obtained, and the particle size of the powder ranged from 20 to 60 μm.

[0056] Powdered. Please refer to Figure 4 and Figure 5 , the diamond-shaped TiAl powder after ball milling is filled in the cavity 3 of the rubber sheath 1, and the powder particles need to be constantly shaken and vibrated during the powder filling process. The rubber sheath 1 used in this embodiment is a barrel-shaped sheath with openings at both ends, and both ends are sealed by a natural rubber plug 4 and an adjustable...

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Abstract

The invention relates to the field of materials, belongs to the field of titanium aluminum intermetallic compounds, and in particular, relates to a fine-grain titanium aluminum powder forming method. The invention provides a design method of a cold isostatic pressing formed ladle and a titanium aluminum powder forming method under different powder production processes; and compact sintering is performed on a pressed blank with excellent forming performances. The method comprises the following steps: original spherical prealloying titanium aluminum powder and element powder are respectively mixed on a planet ball mill and a polishing machine; titanium aluminum powder prepared by the method is filled in a rubber ladle for continuous compaction; then, the rubber ladle and a corresponding device are put in a cold isostatic pressing machine for near net shaping; and the formed pressed blank is sintered in a vacuum sintering furnace to form a needed round rod sample or a small component. The method can realize the near net shaping technology of a titanium aluminum powder component, and is fine in structure grain and excellent in internal metallurgy quality and size deviation control.

Description

technical field [0001] The invention relates to the field of materials, in particular to the field of titanium-aluminum intermetallic compounds, and in particular to a method for forming fine-grained titanium-aluminum powder. Background technique [0002] With the development of high-performance aviation weapons and equipment, there is an urgent demand for high-temperature resistant materials. Titanium-aluminum intermetallic compounds have become key candidate materials for replacing high-temperature alloys to achieve engine weight reduction due to their light weight and excellent high-temperature performance. At present, the research on powder metallurgy titanium-aluminum alloy is mainly divided into mixed element method and pre-alloying method according to the powder making method; according to the forming method, it is mainly divided into hot isostatic pressing, cold isostatic pressing, warm pressing, injection molding, etc. [0003] At present, powder TiAl alloy compone...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C14/00B22F3/04B22F3/10
CPCB22F3/04B22F3/1007B22F2998/10B22F2999/00C22C1/0458C22C14/00B22F2201/20B22F1/0003B22F2009/043
Inventor 孙志雨李建崇朱郎平冯新南海
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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