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Method for preparing Ti2AlNb base alloy through powder metallurgy

A powder metallurgy and base alloy technology, applied in the field of titanium alloy preparation, can solve the problems of large difference in interdiffusion rate, poor sintering performance, high equipment requirements, etc., achieve good room temperature and high temperature mechanical properties, excellent powder sintering performance, and shorten the preparation process The effect of the process

Inactive Publication Date: 2018-05-11
天钛隆(天津)金属材料有限公司
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Problems solved by technology

And the particle size of the pre-alloyed powder is generally coarse (30-200m), the shape is spherical or quasi-spherical, the specific surface area is small, and the sintering performance is poor, so the enhanced sintering process must be used to prepare high-density alloy materials, and these sintering methods are also Large-scale Ti2AlNb alloys that require high equipment, high cost, and are difficult to prepare
However, when the Ti2AlNb alloy is prepared by the mixed element method, the Kirkendall holes produced by the large difference in the interdiffusion rate between aluminum and titanium greatly reduce the material density, and the slow diffusion rate of niobium in titanium leads to element partiality in the alloy. Aggregation, the organization is prone to microscopic segregation

Method used

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  • Method for preparing Ti2AlNb base alloy through powder metallurgy
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  • Method for preparing Ti2AlNb base alloy through powder metallurgy

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Embodiment 1

[0022] Embodiment 1: prepare 50Kg Ti-23Al-17Nb (at%) alloy sintered ingot

[0023] 1. Put 28.5Kg of sponge titanium and 20.7Kg of aluminum-niobium alloy (Nb: 0.75wt%, Al: 0.25wt%) into the hydrogenation furnace, heat the temperature to 450°C, and feed high-purity hydrogen to 0.05-0.1MPa for hydrogenation Processing 12h;

[0024] 2. Under the protection of argon, the material after hydrogenation treatment is ball milled and crushed, and the particle size of the powder after airflow classification is D50 = 10m;

[0025] 3. Add 0.8Kg elemental aluminum powder and mix for 2-10 hours, then put it into the dehydrogenation furnace, heat to 800°C, and keep it warm for 12 hours;

[0026] 4. Put the dehydrogenated powder into a rubber sheath for static pressure molding, the pressure is 200MPa;

[0027] 5. Put the compact after cold isostatic pressing into a vacuum sintering furnace for sintering, the maximum sintering temperature is 1250°C, and the holding time is 2h.

Embodiment 2

[0028] Embodiment 2: prepare 100Kg Ti-22Al-24Nb (at%) alloy sintered ingot

[0029] 1. Put 48Kg of sponge titanium and 48.2Kg of aluminum-niobium alloy (Nb: 0.85wt%, Al: 0.15wt%) into the hydrogenation furnace, heat the temperature to 500°C, and feed high-purity hydrogen to 0.1-0.15MPa for hydrogenation treatment 12h;

[0030] 2. Under the protection of argon, the material after hydrogenation treatment is ball milled and crushed, and the particle size of the powder after airflow classification is D50 = 10m;

[0031] 3. Add 3.8Kg elemental aluminum powder and mix for 2-10 hours, then put it into the dehydrogenation furnace, heat to 850°C, and keep it warm for 15 hours;

[0032] 4. Put the dehydrogenated powder into a rubber sheath for static pressure molding, the pressure is 200MPa;

[0033] 5. Put the compact after cold isostatic pressing into a vacuum sintering furnace for sintering, the maximum sintering temperature is 1300°C, and the holding time is 4h.

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Abstract

The invention provides a method for preparing a Ti2AlNb base alloy through a powder metallurgy process, and belongs to the technical field of titanium alloy preparation. The method is characterized bypreparing a Ti2AlNb base intermetallic compound by using alloy powder, prepared by a hydrogenation / dehydrogenation method, through vacuum pressureless sintering, and comprises the following steps: sponge titanium and an aluminum-niobium alloy are added in a hydrogenation furnace for hydrogenation and crushing classification; and then, simple substance aluminum powder is added for self-propagatingdispersion at 700-900 DEG C to form primary prealloying powder. Finally, a high-compactness and large-size Ti2AlNb alloy ingot is prepared through cold isostatic pressing and vacuum pressureless sintering. A Ti2AlNb alloy material is prepared by using low-cost element powder through hydrogenation / dehydrogenation, cold isostatic pressing and vacuum sintering; the process is simple; and the cost islow. The method can prepare the nearly full-compactness Ti2AlNb alloy with the compactness of more than 98%; and the Ti2AlNb alloy is uniform and fine in material organization, excellent in hot working performance and suitable for industrial scale popularization.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy preparation, and relates to a method for preparing a titanium-aluminum-niobium intermetallic compound, in particular to a method for preparing a Ti2AlNb-based alloy material by powder metallurgy. Background technique [0002] With the rapid development of the aerospace industry, the use of high-temperature structural materials with low density and excellent performance has become a research hotspot at home and abroad. The Ti2AlNb-based alloy mainly composed of O phase is a new type of intermetallic compound material developed in the early 1990s. It has high high-temperature yield strength, fracture toughness, and creep resistance, and has become a material in the temperature range of 600-800 °C. The most potential lightweight high-temperature structural material. [0003] The preparation methods of Ti2AlNb-based alloys are mainly ingot metallurgy (IM) and powder metallurgy (PM). However, ...

Claims

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Application Information

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IPC IPC(8): B22F9/02B22F9/04B22F3/04B22F3/10C22C1/04C22C14/00
CPCB22F3/04B22F3/1007B22F9/023B22F9/04B22F2009/041C22C1/0458C22C14/00
Inventor 张策郭志猛王海英陈勇卢广锋
Owner 天钛隆(天津)金属材料有限公司
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