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Method for synthesizing carbon nano tube modified ultra-high temperature ceramic hybrid powder in situ

A technology of carbon nanotube modification and ultra-high temperature ceramics, which is applied in the field of structural ceramics, can solve problems such as carbon nanotube agglomeration, and achieve the effect of complete structure, no mechanical damage, and small investment

Active Publication Date: 2015-07-22
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem of agglomeration of carbon nanotubes in the existing preparation of carbon nanotube-modified ultra-high temperature ceramics, and proposes a method for in-situ synthesis of carbon nanotube-modified ultra-high temperature ceramic hybrid powders

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  • Method for synthesizing carbon nano tube modified ultra-high temperature ceramic hybrid powder in situ
  • Method for synthesizing carbon nano tube modified ultra-high temperature ceramic hybrid powder in situ

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specific Embodiment approach 1

[0018] Embodiment 1: A method for in-situ synthesis of carbon nanotube-modified ultra-high temperature ceramic hybrid powder is carried out according to the following steps:

[0019] 1. The catalyst Ni(NO 3 ) 2 .6H 2 O is fully dispersed in boron-containing organic polymer precursors and zirconium-containing organic polymer precursors by grinding to obtain a mixed powder of the three, wherein the boron-containing organic polymer precursors are 2,4,6- Tri-methylaminoborazine, the molecular formula is (NHCH 3 ) 3 B 3 N 3 h 3 , the organic polymer precursor containing zirconium is [(C 4 h 8 O)Zr(acac) 2 ] n , n=110~120, the molar ratio of B:Zr is (1~4):1, the catalyst Ni(NO 3 ) 2 .6H 2 The weight ratio of O to boron-containing and zirconium-containing organic polymer precursors is 1:(50~200);

[0020] 2. Put the mixed powder obtained in step 1 in the upper open mold, heat and crack in the tube furnace, and first heat the tube furnace to 950 °C at a heating rate of 4...

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, the molar ratio of B:Zr is (2~3):1, catalyst Ni(NO 3 ) 2 .6H 2 The weight ratio of O to the boron-containing and zirconium-containing organic polymer precursors is 1:(100-150). Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0023] Specific embodiment three: the difference between this embodiment and specific embodiment one is: in step one, the mol ratio of B:Zr is 2.5:1, catalyst Ni(NO 3 ) 2 .6H 2 The weight ratio of O to boron- and zirconium-containing organic polymer precursors was 1:125. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention relates to a method for synthesizing carbon nano tube modified ultra-high temperature ceramic hybrid powder in situ, and the method can be used for solving the problem of agglomeration of carbon nano tubes when carbon nano tube modified ultra-high temperature ceramic is prepared in the prior art. The method for synthesizing the carbon nano tube modified ultra-high temperature ceramic hybrid powder in situ comprises the following steps: 1, sufficiently dispersing a catalyst in an organic polymer precursor to obtain mixed powder; 2, putting the mixed powder obtained in the step 1 into a square mold of which the upper part is open, heating in a tube furnace for cracking till the complete vitrification temperature of the organic polymer precursor is 1,450-1,550 DEG C, and carrying out heat preservation for 0.5-2 hours; 3, naturally cooling the heated and cracked mixed powder obtained in the step 2 to 20-25 DEG C, thus obtaining the carbon nano tube modified ultra-high temperature ceramic hybrid powder. The method is applicable in the technical field of structural ceramics, especially carbon nano tube modified ultra-high temperature ceramics.

Description

technical field [0001] The invention relates to a method for in-situ synthesis of carbon nanotube modified ultra-high temperature ceramic hybrid powder, which belongs to the technical field of structural ceramics. Background technique [0002] Carbon nanotubes have excellent mechanical properties, electrical properties and thermal properties. Carbon nanotubes have a prominent effect on improving the toughness of brittle materials, and carbon nanotubes introduced into ceramics can significantly improve the mechanical properties of materials through bridging. However, carbon nanotubes have a very large aspect ratio and are easy to agglomerate. When used to prepare carbon nanotube-modified composite materials, it is difficult to fully disperse in the matrix, especially in particle powder. [0003] The currently reported methods for preparing carbon nanotubes mainly include chemical vapor deposition, arc discharge and laser ablation. The chemical vapor deposition method has hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/626
Inventor 张幸红徐宝升洪长青韩杰才孟松鹤韩文波
Owner HARBIN INST OF TECH