Method for preparing reinforced titanium-based composite material of carbon nanometer tube through vacuum hot pressing

A technology of titanium-based composite materials and carbon nanotubes, which is applied in metal material coating technology, gaseous chemical plating, coating, etc., can solve problems such as destroying the perfect structure of CNTs, reducing the excellent mechanical properties of CNTs, and weakening the strengthening effect of CNTs , to achieve the effect of simple and stable process, high density and complete structure

Inactive Publication Date: 2014-01-15
TIANJIN UNIV
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  • Abstract
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Problems solved by technology

[0005] CNTs-reinforced titanium-based composites mainly have the following problems: first, the uniform dispersion of CNTs, which exists in the preparation process of all composite materials; second, the structural integrity of CNTs, high-energy ball milling or chemical surface modification. Destroying the perfect structure of CNTs will not only reduce the excellent mechanical properties of CNTs, but more importantly, in the process of powder metallurgy, CNTs with incomplete structure and titanium matrix can easily react at high temperature to form titanium carbide hard particles, which weakens the CNTs. The strengthening effect of

Method used

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  • Method for preparing reinforced titanium-based composite material of carbon nanometer tube through vacuum hot pressing
  • Method for preparing reinforced titanium-based composite material of carbon nanometer tube through vacuum hot pressing
  • Method for preparing reinforced titanium-based composite material of carbon nanometer tube through vacuum hot pressing

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Effect test

Embodiment 1

[0023] After mixing 0.7512g cobalt nitrate hexahydrate and 10g 400 mesh titanium powder, add it into 400mL deionized water for magnetic stirring for 2h, add 0.22g sodium hydroxide into 110mL deionized water and sonicate for 10min to completely dissolve the sodium hydroxide. The sodium hydroxide solution was added dropwise into the aqueous solution of cobalt nitrate hexahydrate and titanium powder mixed, and magnetic stirring was performed while adding dropwise. After the dropwise addition, suction filtration was carried out, and vacuum drying was carried out at 80° C. for 8 hours to obtain cobalt hydroxide / titanium catalyst precursor powder. Spread the precursor powder in the quartz ark, place it in the constant temperature zone of the tube furnace, and heat it up to 400 °C for 1 hour under the protection of argon at a rate of 10 °C / min. ℃, turn off the argon, feed hydrogen at a flow rate of 200mL / min, turn off the hydrogen after holding at 450°C for 1 hour, feed argon, contin...

Embodiment 2

[0025] Mix 0.2479g of cobalt nitrate hexahydrate with 10g of 400 mesh titanium powder, add to 400mL of deionized water for magnetic stirring for 2h, add 0.08g of sodium hydroxide to 400mL of deionized water and ultrasonically for 10min to completely dissolve the sodium hydroxide. Add the sodium hydroxide solution dropwise to the aqueous solution of cobalt nitrate hexahydrate and titanium powder, and magnetically stir while adding. After the dropwise addition, suction filtration was carried out, and vacuum drying was carried out at 80° C. for 6 hours to obtain cobalt hydroxide / titanium catalyst precursor powder. Spread the precursor powder in a quartz ark, place it in the constant temperature zone of a tube furnace, and heat it up to 400°C for 1 hour under the protection of argon at a rate of 10°C / min, then heat up to 450°C at a rate of 10°C / min. ℃, turn off the argon, feed hydrogen at a flow rate of 200mL / min, turn off the hydrogen after holding at 450°C for 1 hour, feed argon...

Embodiment 3

[0027]Mix 0.7512g of cobalt nitrate hexahydrate with 10g of 400 mesh titanium powder, add to 400mL of deionized water and magnetically stir for 2h, add 0.22g of sodium hydroxide to 110mL of deionized water and sonicate for 10min to completely dissolve the sodium hydroxide. Add the sodium hydroxide solution dropwise to the aqueous solution of cobalt nitrate hexahydrate and titanium powder, and magnetically stir while adding. After the dropwise addition, suction filtration was carried out, and vacuum drying was carried out at 80° C. for 8 hours to obtain cobalt hydroxide / titanium catalyst precursor powder. Spread the precursor powder in a quartz ark, place it in the constant temperature zone of a tube furnace, and heat it up to 400°C for 1 hour under the protection of argon at a rate of 10°C / min, then heat up to 450°C at a rate of 10°C / min. ℃, turn off the argon, feed hydrogen at a flow rate of 200mL / min, turn off the hydrogen after holding at 450°C for 1 hour, feed argon, conti...

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Abstract

The invention discloses a method for preparing a reinforced titanium-based composite material of a carbon nanometer tube through vacuum hot pressing, and belongs to the preparation technology of composite materials. The method comprises the following processes: a titanium powder precursor loaded with cobalt hydroxide is prepared by adopting a deposition precipitation method; the carbon nanometer tube is grown on titanium powder loaded with a catalyst by adopting a chemical vapor deposition method to obtain the carbon nanometer tube/titanium composite powder; the carbon nanometer tube/titanium composite powder and pure titanium powder are mixed through ball milling to obtain the reinforced titanium-based composite material of the carbon nanometer tube through a vacuum hot pressing technology. According to the invention, the preparation process is easy to operate, the technology is simple and stable, the vacuum hot pressing forming process is adopted, the composite material can still achieve higher compactness under lower sintering temperature due to the effect of pressure, and the excessive reaction between the carbon nanometer tube and titanium is avoided.

Description

technical field [0001] The invention relates to a method for preparing carbon nanotube-reinforced titanium-based composite materials by vacuum hot pressing, which belongs to the preparation technology of composite materials. Background technique [0002] Since Iijima reported carbon nanotubes (CNTs) in 1991, they have become an ideal reinforcement for composite materials due to their excellent mechanical, thermodynamic and electrical properties, high aspect ratio and low density. CNTs strengthen aluminum, copper, There are many reports on metal substrates such as nickel and magnesium, and the composite materials obtained have excellent properties. Many studies have shown that carbon nanotubes can greatly improve the wear resistance of polymer and ceramic substrates, and there are also some studies on the friction and wear properties of CNTs reinforced metal matrix composites for structural materials. Cumings and Zettle proposed the sliding mechanism of MWCNTs during fricti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C14/00C23C16/26
Inventor 师春生雷红赵乃勤何春年刘恩佐李家俊
Owner TIANJIN UNIV
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