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Modified TiC/Ti6Al4V composite material and manufacture method thereof

A composite material, ti6al4v technology, applied in the field of titanium-based composite materials, can solve problems such as difficulty in realization, and achieve the effect of avoiding complex procedures, improving shape, and simple operation technology

Inactive Publication Date: 2008-08-20
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under general casting conditions, changing the cooling rate to refine the TiC of the alloy or controlling the shape of TiC is sometimes difficult to achieve

Method used

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  • Modified TiC/Ti6Al4V composite material and manufacture method thereof
  • Modified TiC/Ti6Al4V composite material and manufacture method thereof
  • Modified TiC/Ti6Al4V composite material and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] High-purity titanium powder (99.2%, 45μm), aluminum powder (99.6%, 29μm) and carbon black (99.8%, figure 1 shown. It can be seen that the TiC dendrites in the 15vol.%TiC / Ti6Al4V composite material are very coarse, with an average size of about 150 μm.

Embodiment 2

[0019] Firstly, Al / TiC prefabricated alloy is made according to the composition ratio. Then this alloy, titanium sponge, vanadium powder (99.9%, 20 μm), aluminum powder (99.6%, 29 μm) and boron powder (98%, 45 μm) are mixed according to the ratio of 15vol.% TiC / Ti6Al4V composite material, the addition of B The amount is 0.01%, melted in a vacuum water-cooled copper crucible non-consumable electric arc furnace, and stirred by an electromagnetic field, and the amount of each melting is 40g. Obtaining the metallographic structure observation of the as-cast composite material sample containing B obtained by the present invention, the results are as follows: figure 2 shown. It can be seen from the figure that the TiC morphology in the as-cast composite without adding B ( figure 1 ) compared with that, after being treated by the method proposed in the present invention, the TiC dendrites are obviously refined, and the distribution is more uniform, with an average size of about 10...

Embodiment 3

[0021] Firstly, Al / TiC prefabricated alloy is made according to the composition ratio. Then this alloy, titanium sponge, vanadium powder (99.9%, 20 μm), aluminum powder (99.6%, 29 μm) and boron powder (98%, 45 μm) are mixed according to the ratio of 15vol.% TiC / Ti6Al4V composite material, the addition of B The amount is 0.02%, and it is melted in a non-consumable electric arc furnace in a vacuum water-cooled copper crucible, and stirred by an electromagnetic field, and the amount of each melting is 40g. Obtaining the metallographic structure observation of the as-cast composite material sample containing B obtained by the present invention, the results are as follows: image 3 shown. It can be seen from the figure that after being treated by the method proposed in the present invention, the TiC dendrites are further refined, the average size is reduced to about 70 μm, and rod-like and chain-like TiC appear.

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Abstract

The invention provides a modified TiC / Ti6Al4V composite material and a manufacturing method thereof. High-purity titanium powder, aluminum powder and carbon black are dry-mixed according to a certain stoichiometric ratio for 24 h, cold-pressed into a pre-cast block with a density of 50-60 percent, and then placed in a vacuum, high-temperature and self-propagating reaction furnace, heated so as to react and generate an Al / TiC prealloy; then, the prealloy, sponge titanium, vanadium powder, the aluminum powder and boron powder are mixed and proportionated according to 15vol.percent of the TiC / Ti6Al4V composite material, and the added amount of the boron powder is 0.01-0.04 percent; the obtained mixture is melted in a vacuum, water-cooling, copper-crucible and nonconsumable electric arc furnace, stirred by means of electromagnetic field and then smelted to obtain the modified TiC / Ti6Al4V composite material. By adding the microelement B in the process of preparing the composite material, the invention ensures that the growth of the dendritic reinforcement TiC in the composite material is inhibited; furthermore, the size of the dendritic reinforcement TiC is reduced and the shape of the dendritic reinforcement TiC is improved at the same time, thus leading the produced titanium-based alloy composite material to have better performance and broader application range.

Description

(1) Technical field [0001] The invention relates to a composite material, especially a titanium-based composite material. The purpose of the present invention is also to provide a preparation method of the modified titanium-based composite material. (2) Background technology [0002] Titanium-based composites have high specific strength at room temperature and high temperature, low density and high elastic modulus, and are advanced structural materials with broad application prospects in aerospace and automotive industries. The TiC-reinforced Ti6Al4V alloy developed by Dynamet in the United States has room temperature stiffness increased by 15% compared with forged alloys; the strength has been increased from 890MPa to 1420Mpa, and this advantage has been maintained until 650°C; the impact toughness value is as high as 28MPa mm 1 / 2 , is expected to be used in the manufacture of rocket shells, missile tail fins and aero-engine parts. The TiC enhanced β-titanium alloy prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/05
Inventor 王香李新林盖鹏涛马旭梁李莉郑玉峰
Owner HARBIN ENG UNIV
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