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A kind of preparation method of high-purity titanium powder

A titanium powder, high-purity technology, applied in high-pressure torsion processing and hydrogenation dehydrogenation method to prepare titanium powder composite, new preparation field of ultra-fine high-purity titanium powder, can solve the problems of oxygen content reduction, particle size refinement, etc., and achieve distribution Uniform concentration, improved raw material purity, and good process performance

Inactive Publication Date: 2016-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of particle size refinement and oxygen content reduction in the preparation process of high-purity titanium powder, and provide a high-quality high-purity titanium powder for powder metallurgy near-net molding parts, corrosion-resistant components and friction materials, etc. The preparation method of this method has low energy consumption, reduces pollution, improves production efficiency, and reduces production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare ultra-fine high-purity titanium powder with an average particle size of 20 μm and an oxygen content of <0.30%. Use molten salt electrolytic high-purity titanium as raw material, place it in a WC-Co mold, heat it to 300°C and apply a pressure of 5GPa, and twist it 5 times A titanium material with an ultra-fine grain structure is obtained. During the hydrogenation process, the preheating temperature is 180°C, 280°C and 850°C, each stage is kept for 3 hours respectively, and then the furnace temperature is lowered to 450°C for hydrogenation. Keep the hydrogen flowing and absorbing for about 1 hour, and the hydrogenation is completed. Put the titanium hydride in a ball mill jar filled with argon, with a ball-to-material ratio of 10:1, and use a planetary ball mill to crush it. The speed is set to 250 r / min. During the dehydrogenation process of titanium hydride powder into the vacuum furnace, the vacuum degree is kept below 1kPa, and the dehydrogenation is carried ...

Embodiment 2

[0023] Prepare ultra-fine high-purity titanium powder with an average particle size of 35 μm and an oxygen content of <0.25%. Use molten salt electrolytic high-purity titanium as raw material, place it in a WC-Co mold, heat it to 250°C and apply a pressure of 5GPa, and twist it 5 times A titanium material with an ultra-fine grain structure is obtained. During the hydrogenation process, the preheating temperature is 160°C, 250°C and 830°C, each stage is kept for 3 hours, and then the furnace temperature is lowered to 430°C for hydrogenation. Keep the hydrogen flowing and absorbing for about 1 hour, and the hydrogenation is completed. Put the titanium hydride in a ball mill tank filled with argon, with a ball-to-material ratio of 8:1, and use a planetary ball mill to crush it. The speed is set at 230 r / min. During the dehydrogenation process of titanium hydride powder into the vacuum furnace, the vacuum degree is kept below 1kPa, and the dehydrogenation is carried out at 650°C ...

Embodiment 3

[0025] Prepare ultra-fine high-purity titanium powder with an average particle size of 50 μm and an oxygen content of <0.20%. Use molten salt electrolytic high-purity titanium as raw material, place it in a WC-Co mold, heat it to 210°C and apply a pressure of 3GPa, and twist it 3 times A titanium material with an ultra-fine grain structure is obtained. During the hydrogenation process, the preheating temperature is 150°C, 250°C and 800°C, each stage is kept for 3 hours, and then the furnace temperature is lowered to 430°C for hydrogenation. Keep the hydrogen flowing and absorbing for about 1 hour, and the hydrogenation is completed. Put the titanium hydride in a ball mill tank filled with argon, with a ball-to-material ratio of 8:1, and use a planetary ball mill to crush it. The speed is set at 200 r / min. During the dehydrogenation process of titanium hydride powder into the vacuum furnace, the vacuum degree is kept below 1kPa, and the dehydrogenation is carried out at 680°C ...

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Abstract

The invention provides a preparation method of high-purity titanium powder. The method includes the steps: selecting high-purity molten salt electrolysis titanium as raw materials, obtaining ultra-fine grain titanium materials by a high-pressure torsion method, and enabling the titanium raw materials to absorb heat to generate hydrogen absorption reaction, tender and easily crush to a certain particle size by a hydrogenation-dehydrogenation and mechanical ball milling method under a special process control condition; performing dehydrogenation for the titanium raw materials; finally, further crushing the titanium raw materials to obtain ultra-fine high-purity titanium powder. The used raw materials are not sponge titanium obtained by a traditional magnesium heating method, the process is more environmentally friendly, the molten salt electrolysis titanium is high in purity and low in oxygen content, the ultra-fine grain titanium materials treated by severe plastic deformation of high-pressure torsion has high dislocation density and inner stress and a wide-angle non-equilibrium grain boundary, the hydrogenation temperature of the treated ultra-fine grain titanium materials is obviously reduced as compared with untreated titanium materials, raw material oxidation caused by over-high temperature can be effectively reduced, the particle sizes of the prepared titanium powder are small and uniform, and various production requirements are met.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, specifically relates to a composite technology for preparing titanium powder by high-pressure torsion processing and hydrogenation dehydrogenation, and provides a novel preparation method of ultrafine high-purity titanium powder. Background technique [0002] Pure titanium generally refers to titanium materials with a purity (mass fraction) greater than 99%, among which the purity of high-purity titanium can reach 4N grade (99.99%) or even higher. As a member of titanium series products, high-purity titanium not only has low density, high melting point, and strong corrosion resistance, but also has low strength and good plasticity (the elongation rate can reach 50% to 60%, and the shrinkage rate can reach up to 70% to 80%) and other characteristics. In recent years, with the rapid development of high-tech industries such as aerospace and electronic information, the amount of high-puri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/20
Inventor 袁铁锤邱子力李瑞迪刘晓军蒋明祥
Owner CENT SOUTH UNIV
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