Novel powder metallurgy method for preparing nanometer or ultrafine structured titanium products

A kind of product and powder technology, which is applied in the thermomechanical consolidation process to dehydrogenate, consolidate and form the powder, which can solve the problems of long grain refinement time, grain growth, slow temperature rise/fall speed, etc., to achieve improved Grain refinement efficiency, high grain refinement efficiency, effect of reducing dehydrogenation time

Inactive Publication Date: 2016-11-09
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Usually these PCAs are some fatty acids, the main components are C, O and other elements. During the subsequent thermal processing, titanium is easy to interact with C and O, which are decomposed from PCA, which will affect the performance of the final product.
[0010] 2. Long grain refinement time
At present, it usually takes dozens of hours to refine the grains of coarse-grained pure titanium to the nanocrystalline level (<100nm) by high-energy ball milling, and the grain refinement efficiency is low.
[0011] 3. In the traditional thermal consolidation process, due to the slow heating/cooling speed, the fine grains after ball milling are easy to grow in high temperature environment, and the fine grain structure is difficult to be retained in the consolidated bulk sample
[0012] 4. Most of the existing methods of using titanium hydride as a raw material to prepare ultra-fine-grained titanium are to first dehydrogenate the

Method used

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  • Novel powder metallurgy method for preparing nanometer or ultrafine structured titanium products
  • Novel powder metallurgy method for preparing nanometer or ultrafine structured titanium products
  • Novel powder metallurgy method for preparing nanometer or ultrafine structured titanium products

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[0045] The present invention uses titanium hydride powder as raw material, prepares titanium hydride powder with nanocrystalline structure through high-energy ball milling process, and then consolidates into a blank through discharge plasma sintering, and then utilizes induction heating and hot extrusion to ball-mill the titanium hydride powder. The dehydrogenation of the green compact is combined with the densification process to produce a nearly fully dense block extruded titanium profile with high mechanical strength in a relatively short period of time. The technical means and features adopted in the present invention are as follows:

[0046] A. The grain size of titanium hydride powder is refined to nanocrystalline level (<100nm) by high energy ball milling.

[0047] Put the titanium hydride powder and the ball material ratio (the mass ratio of the grinding ball to the powder) into the ball mill jar together and fill it with argon and seal it to ensure the oxygen in the b...

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Abstract

The invention provides a novel powder metallurgy method for preparing nanometer or ultrafine microstructural titanium products. The method includes: step one, reducing grain size of titanium hydride powder to nanocrystalline level; step two, subjecting the titanium hydride powder in the nanocrystalline level to thermal consolidation to form pressed blanks; step three, under inert gas protection, heating the pressed blanks; step four, transferring the heated pressed blanks into an extruding device, and extruding under a certain pressure intensity and extrusion ratio to make the pressed blanks into the nanometer or ultrafine microstructural titanium products through an extruding mould with a certain inner cavity shape; step five, after extrusion is finished, cooling the extruded titanium products to the room temperature, and taking out; step six, heating the titanium products in a vacuum environment. A heating device used at the step three and the extruding device used at the step four are mounted in a same seal system, and insert gas is continuously fed into the seal system in a whole heating and extruding process.

Description

technical field [0001] The invention relates to a preparation method of titanium products, in particular to high-energy ball milling of titanium hydride powder to produce nanocrystalline titanium hydride powder, and adopting a thermomechanical consolidation process to dehydrogenate, consolidate and shape the powder to prepare high-strength titanium products The method belongs to the technical field of non-ferrous metal processing. Background technique [0002] As an important non-ferrous metal material, titanium and titanium alloys have been used in aerospace vehicles, ships and weapons in recent years due to their low density, high specific strength, corrosion resistance, high temperature mechanical properties, fatigue resistance and creep properties. It is widely used in the manufacture of military products. In addition, titanium also has great application potential in industries such as automobile, medical treatment, chemical industry, energy and daily consumption. Ther...

Claims

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Application Information

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IPC IPC(8): B22F3/20B22F3/105B22F3/14
CPCB22F3/001B22F3/105B22F3/14B22F3/20B22F2003/1051B22F2003/145B22F2003/208B22F2998/10B22F2999/00B22F2201/11
Inventor 张德良郑逸锋苏勇君梁加淼周登山
Owner SHANGHAI JIAO TONG UNIV
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