Preparation method of in-situ synthesized carbon nanotube reinforced Mg-matrix composite

A carbon nanotube and composite material technology is applied in the field of preparation of carbon nanotube reinforced magnesium-based composite materials, which can solve the problems of the difficulty of dispersion of boron-doped carbon nanotubes, the problem of agglomeration of carbon nanotubes, and the like, and achieve structural integrity. , easy to operate, good crystallinity

Inactive Publication Date: 2012-09-19
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] ① Grinding magnesium powder and carbon nanotubes or adding a dispersant to ethanol, ultrasonic stirring and dispersing, and then pressing and sintering to form. Although this method is simple, it is difficult to solve the problem of agglomeration of carbon nan...

Method used

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  • Preparation method of in-situ synthesized carbon nanotube reinforced Mg-matrix composite
  • Preparation method of in-situ synthesized carbon nanotube reinforced Mg-matrix composite
  • Preparation method of in-situ synthesized carbon nanotube reinforced Mg-matrix composite

Examples

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Effect test

Embodiment 1

[0027] After mixing 0.64g of cobalt nitrate hexahydrate and 15.0g of magnesium powder, add it to 150ml of absolute ethanol. At the same time, add 0.21g of sodium hydroxide to 120ml of absolute ethanol. The concentration of the ethanol solution of sodium hydroxide is 0.044 mol / L, respectively ultrasonic 10min. Then, the ethanol solution of sodium hydroxide is dropped dropwise into the ethanol solution mixed with cobalt nitrate hexahydrate and magnesium powder, and magnetic stirring is carried out while titrating. After the titration, the mixed liquid was filtered with suction, and then vacuum-dried at a temperature of 50° C. for 2 hours to obtain a precursor powder. Take 10.0g of powder and place it in the constant temperature zone of the tube furnace, heat up to 400°C at a rate of 10°C / min and calcinate for 1 hour under the protection of argon, continue to heat up to 450°C at a rate of 10°C / min, and turn off the argon , feed hydrogen at a flow rate of 250mL / min, keep it at 45...

Embodiment 2

[0029] After mixing 0.33g of cobalt nitrate hexahydrate and 5.0g of magnesium powder, add it to 150ml of absolute ethanol. At the same time, add 0.11g of sodium hydroxide to 120ml of absolute ethanol. The concentration of the ethanol solution of sodium hydroxide is 0.023 mol / L, respectively ultrasonic 30min. Then, the ethanol solution of sodium hydroxide is dropped dropwise into the ethanol solution mixed with cobalt nitrate hexahydrate and magnesium powder, and magnetic stirring is carried out while titrating. After the titration, the mixed liquid was suction-filtered, and then vacuum-dried at a temperature of 80° C. for 5 hours to obtain a precursor powder. Take 1.0g of powder and place it in the constant temperature zone of the tube furnace, heat up to 300°C at a rate of 10°C / min and calcinate for 1 hour under the protection of argon, continue to heat up to 400°C at a rate of 10°C / min, and turn off the argon , flow in hydrogen at a flow rate of 100mL / min, keep the temperat...

Embodiment 3

[0031]After mixing 1.12g of cobalt nitrate hexahydrate and 5.0g of magnesium powder, add it to 150ml of absolute ethanol. At the same time, add 0.36g of sodium hydroxide to 120ml of absolute ethanol. The concentration of the ethanol solution of sodium hydroxide is 0.075 mol / L, respectively ultrasonic 60min. Then, the ethanol solution of sodium hydroxide is dropped dropwise into the ethanol solution mixed with cobalt nitrate hexahydrate and magnesium powder, and magnetic stirring is carried out while titrating. After the titration, the mixed liquid was suction-filtered, and then vacuum-dried at a temperature of 30° C. for 10 hours to obtain a precursor powder. Take 3.0g of powder and place it in the constant temperature zone of the tube furnace, heat up to 400°C at a rate of 10°C / min and calcinate for 3 hours under the protection of argon, continue to heat up to 500°C at a rate of 10°C / min, and turn off the argon , feed hydrogen at a flow rate of 150mL / min, keep the temperatur...

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Abstract

The invention discloses a preparation method of an in-situ synthesized carbon nanotube reinforced Mg-matrix composite. The method comprises the following processes of: preparing a Co/Mg catalyst precursor by using a deposition-precipitation method; growing carbon nanotubes on the catalyst precursor by using a chemical vapor deposition method; performing ball-milling on the mixed powder of the in-situ synthesized carbon nanotubes and magnesium powder for a short time; pressing the ball-milled mixed powder, forming and sintering; and finally, applying a hot extrusion technology to obtain the in-situ synthesized carbon nanotube reinforced Mg-matrix composite. The preparation method is easy to operate in the preparation process and simple and stable in process; and the obtained carbon nanotubes are uniformly dispersed on the surface of the magnesium powder, so that the performance of the Mg-matrix composite is greatly improved. The prepared high-strength Mg-matrix composite can be widely applied to the fields such as aerospaces, automobiles and the like.

Description

technical field [0001] The invention relates to a method for preparing an in-situ synthesized carbon nanotube reinforced magnesium-based composite material, which belongs to the preparation technology of the magnesium-based composite material. Background technique [0002] Magnesium-based composite material is a kind of light metal composite material. Its main characteristics are low density, high specific strength and high specific stiffness. It also has good impact resistance, high temperature resistance, wear resistance, excellent shock absorption performance and good Dimensional stability, etc. In addition, it also has hydrogen storage properties and electromagnetic shielding properties. It is a class of excellent structural and functional materials, and it is also one of the most promising composite materials in today's high-tech fields. It is used in aerospace, electronic packaging, and automobiles. There are huge application prospects. Therefore, magnesium matrix co...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C1/10C22C23/00
Inventor 师春生孙福俊赵乃勤刘恩佐何春年
Owner TIANJIN UNIV
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