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Preparation method for in situ synthesis of bracelet type Al4C3 nanometer lines by sol-gel and carbon reduction technology

An in-situ synthesis, al4c3 technology, applied in the field of carbon fiber composite material preparation, can solve the problems of uneven growth and difficulty of ZrC whiskers, achieve good economic and social benefits, simple preparation method, and improve mechanical properties.

Active Publication Date: 2017-05-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the growth of ZrC whiskers is not uniform, and it is still difficult to apply such ZrC whiskers in engineering practice.

Method used

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  • Preparation method for in situ synthesis of bracelet type Al4C3 nanometer lines by sol-gel and carbon reduction technology
  • Preparation method for in situ synthesis of bracelet type Al4C3 nanometer lines by sol-gel and carbon reduction technology
  • Preparation method for in situ synthesis of bracelet type Al4C3 nanometer lines by sol-gel and carbon reduction technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take carbon felt (0.43-0.45g / cm 3 ) was cut, sheared and ground into a sample with a size of 10×10×10 mm and a flat surface, and the sample was put into a graphite mold holder and loaded into a CVI furnace. Vacuumize the furnace chamber, then open the argon valve for flushing. Repeat this 3 times; start the temperature and time control program, raise the temperature to 1000°C, the heating rate is 4°C / min, and the heating time is 4h, and the argon gas is supplied for protection, and the argon flow rate is 1500ml / min; when the temperature reaches 1000°C, Open the natural gas valve, set the natural gas flow rate to 80L / h, and set the Ar gas flow rate to 1600ml / min at the same time, and deposit for 1.5h; close the natural gas valve and flow meter, adjust the argon flow rate to 1500ml / min, turn off the power, and naturally Cool to room temperature; close the argon gas valve and flowmeter, and the experiment ends.

[0029] Measure 50mL of aluminum sol into a beaker and stir...

Embodiment 2

[0032] Take carbon felt (0.43-0.45g / cm 3 ) was cut, sheared and ground into a sample with a size of 10×10×10 mm and a flat surface, and the sample was put into a graphite mold holder and loaded into a CVI furnace. Vacuumize the furnace chamber, then open the argon valve for flushing. Repeat this for 3 times; start the temperature and time control program, raise the temperature to 1000°C, the heating rate is 4°C / min, the heating time is 4h, and the argon gas is supplied for protection, and the argon flow rate is 1500ml / min; when the temperature reaches 1000°C, Open the natural gas valve, set the natural gas flow rate to 80L / h, and set the Ar gas flow rate to 1600ml / min at the same time, deposit for 1.5h; close the natural gas valve and flow meter, adjust the argon flow rate to 1500ml / min, turn off the power, and naturally Cool to room temperature; close the argon gas valve and flowmeter, and the experiment ends.

[0033]Measure 50mL of aluminum sol into a beaker and stir; wei...

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Abstract

The invention relates to a preparation method for in situ synthesis of bracelet type Al4C3 nanometer lines by a sol-gel and carbon reduction technology. A carbon source layer is deposed on a prefabricated body by a CVI method; then, a prefabricated body containing a carbon source layer is immersed into a sol which contains calcium oxide as catalysts and has the uniform and stable ingredients; finally, the prefabricated body is suspended in the top end position inside a graphite mold containing mixed carbon powder and aluminum oxide powder; through the heat treatment at a certain temperature, an aluminum source and a carbon source mutually diffuse; the bracelet type Al4C3 nanometer lines grow under the effect of catalysts. The preparation method has the advantages that simplicity is realized; no pollution is realized; the direction is controllable; the growth direction of the nanometer lines capable of being artificially designed reaches the goals of improving the mechanical property, the isotropy, the fracturing toughness, the creep resistant and the oxidation resistance of the composite material. Meanwhile, the material can be applied to resin-based, metal-based and ceramic-based composite materials, and has good economic benefits and social benefits.

Description

technical field [0001] The invention belongs to a method for preparing carbon fiber composite materials, in particular to a method for in-situ synthesis of bracelet-shaped Al by using sol-gel + carbothermal reduction technology 4 C 3 Methods of preparing nanowires. Background technique [0002] Carbon fiber reinforced composite material is a structural material with the most application potential in the high-tech field. Due to its light specific gravity, high modulus, small thermal expansion coefficient, high specific strength at high temperature, excellent friction and wear resistance, and extremely corrosion resistance, it has been widely used in aerospace, military, medicine, construction and other fields. However, when carbon fiber reinforced composite materials are used as engineering components, there are problems such as easy oxidation, low toughness, and poor impact resistance, which seriously limit the further application of this type of composite materials. When...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622C04B41/87
CPCC04B35/622C04B35/83C04B41/009C04B41/5057C04B41/87C04B41/4537C04B41/4556
Inventor 史小红闫宁宁李贺军
Owner NORTHWESTERN POLYTECHNICAL UNIV