Preparation method of oxygen-containing titanium-based alloy through powder metallurgy

A powder metallurgy and titanium-based alloy technology, applied in the field of powder metallurgy structural material preparation, can solve the problems of high cost, long preparation process, complex process, etc., and achieve the effect of weakening the damage of plasticity, simple composition and low price

Inactive Publication Date: 2014-02-12
CENT SOUTH UNIV
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  • Summary
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  • Application Information

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Problems solved by technology

However, the above two methods all have the disadvantages of

Method used

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example

[0019] The following is a detailed description of the embodiments of the present invention. This embodiment is implemented on the premise of the following technical solutions of the present invention, and provides detailed implementation methods and specific operation processes.

[0020] In the embodiment of the present invention and the comparative example, the compressive strength of the prepared material is measured by room temperature unidirectional compression method; the plasticity is represented by the compressibility, that is, the change rate of the sample height before and after compression deformation is used to represent; the density is measured by the drainage method; Oxygen content was determined by reduction method.

Embodiment 1

[0026] The pure titanium powder (purity over 99%) with an average particle size of 150 μm is kept at 500°C for 60 minutes in an oxygen-containing air environment (volume concentration 20%) for high-temperature solid surface oxygen penetration treatment, and the powder is cooled. Put the powder in a graphite mold, place it in a vacuum hot-press sintering furnace for sintering, the sintering pressure is 25MPa, the sintering time is 180 minutes, and the sintering temperature is 1400°C. After sintering, the compressive strength of the block material is 1650MPa, the compression rate is 3.5%, the density of the sintered body is 98.1%, and the oxygen content in the block material is 1.8%.

Embodiment 2

[0028] The pure titanium powder (purity over 99%) with an average particle size of 50 μm is kept at 600°C for 30 minutes in an oxygen-containing air environment (volume concentration 20%) for high-temperature solid surface oxygen penetration treatment, and the powder is cooled. Put the powder in a graphite mold, place it in a plasma sintering furnace for sintering, the sintering pressure is 50MPa, the sintering time is 5 minutes, and the sintering temperature is 1000°C. After sintering, the compressive strength of the bulk material is 2005 MPa, the compressive rate is 2.6%, the density of the sintered body is 99.3%, and the oxygen content in the bulk material is 2.3%.

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Abstract

The invention provides a preparation method of an oxygen-containing titanium-based alloy through powder metallurgy, which belongs to the technical field of the preparation of powder metallurgy structured materials. Through the adoption of pure titanium powder or titanium alloy powder, an oxygen-containing titanium alloy with a high temperature is prepared by using a high-performance solid-state surface oxygen impregnating-activated sintering method. The preparation process is implemented as follows: 1) carrying out solid-state surface oxygen impregnating on pure titanium powder or titanium alloy powder at high temperature in an oxygen environment, and then cooling the obtained powder; and 2) sintering the powder subjected to high-temperature oxygen impregnating into blocks by way of activated sintering in a hot-pressing sintering furnace or a plasma sintering furnace. According to the invention, through a reasonable microstructure design, and by fully using the reinforcement action of cheap oxygen and reducing the damage thereof on plasticity, an oxygen-containing titanium-based alloy with simple compositions and a low price is prepared, so that resources can be reduced, and the cost can be reduced. The preparation method disclosed by the invention is simple in process, and can be suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing an oxygen-containing titanium-based alloy by powder metallurgy. The invention belongs to the technical field of preparation of powder metallurgy structural materials. Background technique [0002] Titanium and its alloys have been widely used in aerospace and other military and civilian fields due to their advantages of light weight, high strength, good thermal strength, corrosion resistance and excellent biocompatibility. Solid solution strengthening is one of the main ways of strengthening titanium alloys. The literature shows that 0.4% oxygen can increase the tensile yield strength of pure titanium from 180MPa to 610MPa, and its strengthening effect is much higher than that of other commonly used alloying elements such as Al, Ag, Zr, Mo [Titanium alloys in Russian aircraft and aerospace Application on the Internet, Aviation Industry Press, 2008, p2]. The maximum solid solubility of oxygen in Ti is 1...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C14/00
Inventor 肖代红
Owner CENT SOUTH UNIV
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