Method using sol-gel method to synthesize spiral ZrC whiskers in in-situ manner

A sol-gel method and in-situ synthesis technology, which is applied in the field of in-situ synthesis of helical ZrC whiskers by sol-gel method, can solve problems not involved in the application of ZrC whiskers, etc., and achieve improved erosion resistance, strength and Toughness, the effect of improving mechanical properties

Active Publication Date: 2016-10-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it does not involve the application of ZrC whiskers in composite materials

Method used

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  • Method using sol-gel method to synthesize spiral ZrC whiskers in in-situ manner
  • Method using sol-gel method to synthesize spiral ZrC whiskers in in-situ manner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take 2.5D needle-punched carbon felt (0.43-0.45g / cm 3 ) was cut, sheared and ground into a sample with a size of 70×50×10 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.

[0044] Measure 50mL of ethanol and put...

Embodiment 2

[0047] Take 2.5D needle-punched carbon felt (0.43-0.45g / cm 3 ) was cut, sheared and ground into a sample with a size of 70×50×10 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, deposit for 2h; close the natural gas valve and flow meter, adjust the argon flow rate to 1500ml / min, turn off the power, and cool naturally to room temperature; close the argon gas valve and flowmeter, and the experiment ends.

[0048] Measure 50mL of ethanol and put it in...

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Abstract

The invention relates to a method using a sol-gel method to synthesize spiral ZrC whiskers in an in-situ manner. A carbon source layer is precipitated on a carbon-fiber prefabricated body through a CVI method, and the prefabricated body with the carbon source layer is dipped into sol with even and stable components. Due to the fact that metal organic zirconium salt (zirconium n-propoxide) can effectively moisten the carbon-fiber prefabricated body, the zirconium source can be evenly spread on the surfaces of carbon fibers, and the zirconium source and the carbon source are diffused mutually after thermal treatment of certain temperature to obtain the ZrC whiskers spirally growing along the surfaces of the carbon fibers. The method is simple, free of pollution, controllable in direction, high in production efficiency, safe, stable and reliable in technology, capable of artificially designing the growing direction of the whiskers so as to increase the mechanical performance and oxidation and ablation resistance of composite materials, applicable to composite materials such as resin-based composite materials and ceramic-based composite materials and good in economic and social benefits.

Description

technical field [0001] The invention belongs to the application of in-situ helical whiskers prepared by a sol-gel method in the technical field of composite materials, and relates to a method for in-situ synthesis of helical ZrC whiskers by a sol-gel method. 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 high brittleness, low toughness, and poor impact resistance, which seriously limit the further application of this type of composite materials, especially c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/56C04B35/624
CPCC04B35/5622C04B35/624C04B35/83
Inventor 史小红闫宁宁李贺军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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