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Preparation method of gradient titanium material

A technology of gradient and titanium rods, applied in the field of preparation of gradient titanium materials, can solve the problems of rapid mass production; limited mass preparation and application of materials, inability to process columnar metals, long processing cycle, etc., to achieve low cost and stable product quality , the effect of simple processing technology

Active Publication Date: 2020-01-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of SMAT is that it cannot process columnar metals. The disadvantage of SMGT is that it has a long processing cycle and cannot be produced quickly and in large quantities; these shortcomings limit the mass preparation and application of materials.

Method used

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  • Preparation method of gradient titanium material
  • Preparation method of gradient titanium material

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Experimental program
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Embodiment 1

[0021] A preparation method of a high-hardness graded structure titanium material, specifically comprising the following steps:

[0022] (1) Control the particle size of the titanium powder (purity: 99.6%), sieve it on a -200 mesh sieve, and take the undersieve for later use.

[0023] (2) The titanium powder obtained in step (1) is compression molded (400MPa) to form a block with a diameter of 60mm (density 85%).

[0024] (3) The block obtained in step (2) was vacuum sintered at 1300°C, kept for 1.5h, and then cooled to room temperature (density 93%) under a gas protection device.

[0025] (4) For the titanium sample obtained in step (3), the titanium rod with a diameter of 20mm was formed by hot extrusion (600°C) with variable channel extrusion method, the temperature rising rate was 150°C / min, the extrusion ratio was 8:1, and the hardness Experimental test; the hardness value of titanium material can reach 2630MPa, the thickness of the gradient layer is about 150μm, and the...

Embodiment 2

[0029] A preparation method of a high-hardness graded structure titanium material, specifically comprising the following steps:

[0030] (1) Control the particle size of the titanium powder (purity: 99.7%), screen it on a -200 mesh sieve, and take the undersieve for later use.

[0031] (2) The titanium powder obtained in step (1) is compression-molded to form a block with a diameter of 60 mm (density 85%).

[0032] (3) Vacuum sinter the block obtained in step (2) at 1300°C, keep it warm for 2 hours, and then cool it to room temperature under a gas protection device.

[0033] (4) For the titanium sample obtained in step (3), the titanium rod with a diameter of 20mm was formed by hot extrusion (700°C) with variable channel extrusion method, the temperature rising rate was 180°C / min, the extrusion ratio was 9:1, and the hardness Experimental tests show that the hardness value of the gradient titanium material can reach 2700MPa, the thickness of the gradient layer is about 150μm,...

Embodiment 3

[0037] A preparation method of a high-hardness graded structure titanium material, specifically comprising the following steps:

[0038] (1) Control the particle size of the titanium powder (purity: 99.7%), screen it on a -200 mesh sieve, and take the undersieve for later use.

[0039] (2) The titanium powder obtained in step (1) is compression-molded to form a block with a diameter of 60 mm (density 85%).

[0040] (3) Vacuum sinter the block obtained in step (2) at 1250°C, keep it warm for 1 hour, and then cool it to room temperature under a gas protection device.

[0041] (4) For the titanium sample obtained in step (3), the titanium rod with a diameter of 20mm was formed by hot extrusion (650°C) with variable channel extrusion method, the temperature rising rate was 170°C / min, the extrusion ratio was 9:1, and the hardness Experimental test.

[0042] (5) The 20mm titanium rod in step (4) was forged at room temperature to form a 4.5mm diameter titanium rod, and the hardness...

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Abstract

The invention discloses a preparation method of a gradient titanium material, and belongs to the technical field of metal material processing. The method includes the steps that firstly, titanium powder is subjected to compression moulding forming, and after forming, vacuum sintering, heat preservation and cooling are conducted; then variant channel extrusion molding is conducted at different temperatures to obtain the gradient-structured titanium material, finally the gradient from the surface to the center of a titanium bar is changed through rotary swaging processing, and a hardness value is effectively increased through rotary swaging processing. A hardness curve shows that the hardness value of the prepared titanium material varies with the distance from the surface to the center, through the simple preparation method, titanium is formed into the gradient-structured material, and important value and application space are achieved in the rapid-developed fields of medical treatment,aerospace and the like.

Description

technical field [0001] The invention relates to a preparation method of a gradient titanium material, which belongs to the technical field of metal material processing. Background technique [0002] Titanium has many excellent comprehensive properties: titanium alloy has low density, high melting point (the melting point of titanium is 1668 ° C, slightly higher than that of iron and nickel, and more than 1000 ° C higher than the melting point of aluminum and magnesium), high specific strength (while the strength and Ordinary structural steel is equivalent or higher. Among metal structural materials, titanium has the highest specific strength), and good corrosion resistance (titanium is very easy to form a solid oxide film on the surface with oxygen in an oxidizing atmosphere. Atmosphere, seawater, soil and many chemical media have strong corrosion resistance), good process performance and other advantages, it is an ideal aerospace engineering structural material. Titanium h...

Claims

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Application Information

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IPC IPC(8): B22F3/02B22F3/10B22F3/20B22F3/17
CPCB22F3/02B22F3/10B22F3/20B22F3/17B22F2003/208B22F2998/10
Inventor 高洪亮朱心昆
Owner KUNMING UNIV OF SCI & TECH