Ultrafast sintering method for preparing carbon nano-tube reinforced ceramic

A technology of carbon nanotubes and sintering method is applied in the field of preparation of carbon nanotube reinforced ceramics, which can solve the problems of slow heating rate, short duration of high temperature, damage and the like, and achieve the effects of avoiding damage and improving fracture toughness.

Inactive Publication Date: 2009-06-24
WUHAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Ordinary radiation heating conditions, such as hot pressing sintering, have a slow heating rate (10-50°C/min) and a long duration of high temperature. It has been reported that the damage to carbon nanotubes is serious, and the fracture toughness of ceramics is basically not improved; SPS ( Spark plasma sintering) sintering can prevent carbon nanotubes from being damaged because of its fast heating rate (100-600°C/min), low sintering temperature, short duration of high temperature,

Method used

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Examples

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Example Embodiment

[0027] Example 1:

[0028] Such as figure 1 As shown, an ultra-fast sintering method for preparing carbon nanotube-reinforced ceramics includes the following steps:

[0029] 1) According to the quality of carbon nanotube (CNTs) powder as Al 2 O 3 0.5wt% of powder mass, Al 2 O 3 The powder is 3g, select carbon nanotube powder and Al 2 O 3 Powder; disperse carbon nanotube (CNTs) powder and alumina powder (200nm) in alcohol, and ultrasonically disperse for 2 hours to obtain slurry; the quality of alcohol is Al 2 O 3 3 times the mass of powder;

[0030] 2) Ball mill the obtained slurry for 24 hours (the ball milling medium is agate balls), and rotate to evaporate to remove the alcohol to obtain a dry and uniformly mixed composite powder;

[0031] 3) Press the obtained composite powder into a disc shape (20mm in diameter and 3mm in thickness) to obtain the raw material to be sintered;

[0032] 4) Select Cr 2 O 3 +Al+C system is solid combustion reaction material, Cr 2 O 3 : The ratio ...

Example Embodiment

[0036] Example 2:

[0037] An ultra-fast sintering method for preparing carbon nanotube reinforced ceramics, which includes the following steps:

[0038] 1) According to the quality of carbon nanotube (CNTs) powder as TiB 2 1wt% of powder mass, TiB 2 The powder is 3g, select carbon nanotube powder and TiB 2 Powder; Combine carbon nanotube powder with TiB 2 The powder is dispersed in alcohol, and ultrasonically dispersed for 2h to obtain slurry; the quality of alcohol is TiB 2 5 times the mass of powder;

[0039] 2) Ball mill the obtained slurry for 24 hours (the ball milling medium is agate balls), and rotate to evaporate to remove the alcohol to obtain a dry and uniformly mixed composite powder;

[0040] 3) Press the obtained composite powder into a disc shape (diameter 20mm, thickness 3mm) to obtain the raw material to be sintered;

[0041] 4) The Ti+C system is selected as the solid combustion reaction material, the ratio of the amount of Ti:C is 1:1, the measured maximum combu...

Example Embodiment

[0045] Example 3:

[0046] An ultra-fast sintering method for preparing carbon nanotube reinforced ceramics, which includes the following steps:

[0047] 1) According to the quality of carbon nanotube (CNTs) powder as Al 2 O 3 0.5wt% of powder (200nm) mass, Al 2 O 3 The powder is 3g, select carbon nanotube powder and Al 2 O 3 Powder; combine carbon nanotube powder with Al 2 O 3 The powder is dispersed in alcohol, and ultrasonically dispersed for 2 hours to obtain a slurry; the quality of the alcohol is 6 times that of the ceramic powder;

[0048] 2) Ball mill the obtained slurry for 24 hours (the ball milling medium is agate balls), and rotate to evaporate to remove the alcohol to obtain a dry and uniformly mixed composite powder;

[0049] 3) Press the obtained composite powder into a disc shape (diameter 20mm, thickness 3mm) to obtain the raw material to be sintered;

[0050] 4) Select Ti+C+ diluent as the solid combustion reaction material, the ratio of Ti:C substance is 1:1, th...

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Abstract

The invention relates to a preparation method of carbon nanotube reinforced ceramic. An ultra-fast sintering method for preparing the carbon nanotube reinforced ceramic is characterized by comprising the following steps: enwrapping a material blank to be sintered with a solid combustion reactant; firing the reactant to allow a high-temperature combustion reaction; transmitting heat of the high-temperature reaction to the material blank to be sintered so as to rapidly heat the material blank to be sintered to a high temperature; and applying mechanical pressure on the high-temperature material blank to be sintered to obtain the compact carbon nanotube reinforced ceramic. The method can provide an ultra-fast temperature rise speed (1600-2900 DEG C/min) for sintering ceramic, a maximum temperature is 1450 DEG C-2620 DEG C, and the ceramic sintering can be completed in a very short time (1-2min), which effectively avoids damage to the carbon nanotube; meanwhile, the higher mechanical pressure (100-500MPa) applied at the high temperature is beneficial to forming a good interface between the carbon nanotube and a ceramic substrate, thus effectively improving fracture toughness of the ceramic material.

Description

technical field [0001] The invention relates to a preparation method of carbon nanotube reinforced ceramics. Background technique [0002] Carbon nanotubes (CNTs) have been a research hotspot in the field of nanomaterials since their discovery because of their superior mechanical, thermal, and electrical properties. The average elastic modulus of single-walled carbon nanotubes is 1.25TPa, and the average elastic modulus of multi-walled carbon nanotubes is between 270-950GPa. The excellent mechanical properties make them have great development potential in the field of composite materials. In recent years, carbon nanotubes have been widely used as reinforcing phases of polymer materials and ceramic materials. Research on carbon nanotube-reinforced ceramics by scholars at home and abroad shows that carbon nanotubes can improve the mechanical properties of ceramic materials, but their toughening effect has not made breakthroughs. There are three problems to be solved in the p...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/64C04B35/63
Inventor 傅正义黄利伟张金咏王玉成王为民王皓张清杰
Owner WUHAN UNIV OF TECH
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