Preparation of porosity controllable porous titanium

A porous titanium and porosity technology, applied in the field of powder metallurgy molding, can solve the problems of uncontrollable pore size and shape, complex gas involvement technology, low porosity, etc., and achieve low equipment requirements, convenient operation, and low raw material cost Effect

Inactive Publication Date: 2009-01-28
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the more common methods include powder direct sintering method, hollow ball sintering method and gas entrainment technology, but these methods all have some inherent disadvantages, for example, powder direct sintering is very dependent on raw material powder, pores The size and shape of the hollow spheres cannot be controlled; hollow spheres can be sintered to prepare a mixed structure of open and closed cells, but the cost is high; the gas entrainment technology is complicated, the cost is high, and the porosity is low.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0018] The present invention relates to a kind of preparation method of porous titanium (and its alloy), based on powder metallurgy technology, raw material is high-purity titanium powder or alloy powder, granular urea is pore-forming agent, specific implementation steps are as follows:

[0019] (1) Fully mix titanium powder or titanium alloy powder with a binder whose addition amount is 1.wt% to 4.wt%;

[0020] (2) Using urea granules as a pore-forming agent, adding the pore-forming agent to the mixture obtained in step (1), the ratio of the volume fraction of the pore-forming agent to the mixture is 30-80%: 70-20%, the total amount 100%; and mixed in a V-type mixer for 1 to 2 hours;

[0021] (3) Then, under the pressure of 100MPa~250MPa, the mixture obtained in step (2) is subjected to powder unidirectional pressing in a mould;

[0022] (4) Keep the resulting green compact at a vacuum degree of 10 -2 ~10 -3 The heat treatment is carried out in a vacuum furnace of Pa, that...

example 1

[0026] Example 1: raw material titanium powder (200~325 orders) and urea (20~24 orders) proportioning according to 70% porosity: promptly the ratio of the volume fraction of raw material titanium powder and urea is 30%: 70%; Binder content It is 2.0wt% of the raw titanium powder. After adding the binder, the raw titanium powder is mixed with urea for 1 hour, unidirectionally pressed (in the mold) at 200 MPa, and then sintered at 1280 ° C for 3 hours to obtain an actual porosity of 65%. Porous titanium with a size of about 800 μm and a strength of 24.7 MPa.

example 2

[0027] Example 2: raw material titanium alloy powder (Ti6A14V alloy powder, 200~325 orders) and urea (60~80 orders) by 40% porosity proportioning: promptly the ratio of the volume fraction of raw material titanium alloy powder and urea is 60%: 40 %; binder content is 3.0wt% of raw material titanium alloy powder, raw material titanium alloy powder adds binder and mixes with urea 1.5h, under 150MPa unidirectional pressing (in the mould), then sintering 4h under 1300 ℃, A porous titanium alloy with an actual porosity of 38%, a pore size of 200 μm and a strength of 85.1 MPa was obtained.

[0028] The innovation of the present invention is that according to the ratio of the volume fraction of titanium powder or alloy powder to urea, the porosity can be adjusted within a relatively large range of 30-80%; Pore ​​shape, to achieve the purpose of controlling the porosity, pore size and pore shape of porous titanium. It is not limited to the ratio of various raw materials in the above ...

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Abstract

The invention provides a preparation method of a porous titanium with controllable porosity, comprising the following steps: Ti powder and 1 wt.%-4 wt.% of binder are well mixed; urea particles are used as a pore forming agent and added into the mixture, the volume fraction between the pore forming agent and the mixture is 30-80 percent: 70-20 percent, and the mixture is mixed fully and evenly; and then the obtained mixture is one-direction pressed into blanks under the pressure of 100MPa to 250MPa; the obtained green compact is heated in a vacuum furnace with the vacuum degree kept between 10<-2> to 10<-3>Pa, thus obtaining porous metal members. The porosity can be determined by the quantity of added urea in the invention, and the size and shape of the pores can be determined according to the size (200Mum to 2mm) and shape of urea particles, thus realizing the target of controllable porosity, pore size and pore shape; the preparation method of the invention also has the advantages of simple technique, low equipment requirement, convenient operation and low cost.

Description

technical field [0001] The invention relates to powder metallurgy forming technology, in particular to a preparation method of porous titanium and its alloy with controllable porosity and pore size. Background technique [0002] my country has the largest reserves of titanium resources. How to effectively utilize this resource advantage and develop high value-added titanium-containing new materials has become the focus of research in recent years. Titanium and titanium alloys have excellent properties such as low density, high specific strength, wide operating temperature range, good corrosion resistance and biocompatibility. Porous materials are a new type of structural and functional materials in the current material world, and have been applied in many fields. Porous titanium foam and its alloys combine the characteristics of titanium alloy and metal foam, which can reduce the weight of the material without weakening its strength, and also have high toughness and corrosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08
Inventor 邱贵宝牛文娟白晨光吕学伟陈登福温良英董凌燕
Owner CHONGQING UNIV
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