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A method for rapidly preparing titanium-aluminum-carbon ceramics at room temperature

A titanium-aluminum-carbon, fast technology, applied in the field of rapid preparation of titanium-aluminum-carbon ceramics at room temperature, can solve the problems of difficult process control and high equipment requirements, and achieve the effects of low equipment requirements, low preparation temperature, and uniform grain size distribution

Active Publication Date: 2021-05-18
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for rapidly preparing titanium-aluminum-carbon ceramics at room temperature in order to overcome the shortcomings of the prior art that high-temperature synthesis and sintering of titanium-aluminum-carbon ceramics require high equipment and the process is complicated and difficult to control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for rapidly preparing titanium-aluminum-carbon ceramics at room temperature, comprising:

[0049] (1) Dissolve graphene oxide (diameter: 0.5-10μm, number of layers: 1-5 layers) in deionized water, configure the solid content to be 3g / L, and use ultrasonic vibration for 40min, then magnetically stir for 3h, so that graphite oxide Fully dissolve the alkenes in deionized water to form a uniform solution, then add L-ascorbic acid to the above solution to control its concentration to 1g / L, and magnetically stir for 3 hours, then place it in an oven at 80°C to fully reduce it reaction to form a graphene hydrogel with a uniform structure;

[0050] (2) Put the graphene hydrogel obtained in step 1 into an electric blast drying oven at 50° C. for drying and dehydration for 4 hours to obtain a porous and loose graphene aerogel with a larger specific surface area;

[0051] (3) get the graphene aerogel obtained in step 2, micron grade titanium powder (Ti) (1 μ m) and micro...

Embodiment 2

[0054] A method for rapidly preparing titanium-aluminum-carbon ceramics at room temperature, comprising:

[0055](1) Dissolve graphene oxide (diameter: 0.5-10 μm, number of layers: 1-5 layers) in deionized water, configure a solid content of 5g / L, and use ultrasonic vibration for 60 minutes, then magnetically stir for 5 hours, so that graphite oxide Fully dissolve the alkenes in deionized water to form a homogeneous solution, then add L-ascorbic acid to the above solution to control its concentration to 2g / L, and stir it magnetically for 8 hours, and then place it in an oven at 90°C to fully reduce it reaction to form a graphene hydrogel with a uniform structure;

[0056] (2) Put the graphene hydrogel obtained in step 1 into an electric blast drying oven at 60° C. for drying and dehydration for 8 hours to obtain a porous and loose graphene aerogel with a larger specific surface area;

[0057] (3) get the graphene aerogel obtained in step 2, micron grade titanium powder (Ti) (...

Embodiment 3

[0060] A method for rapidly preparing titanium-aluminum-carbon ceramics at room temperature, comprising:

[0061] (1) Dissolve graphene oxide (diameter: 0.5-10 μm, number of layers: 1-5 layers) in deionized water, configure a solid content of 3 g / L, and use ultrasonic vibration for 100 minutes, then magnetically stir for 10 hours, so that graphite oxide Fully dissolve the alkenes in deionized water to form a homogeneous solution, then add L-ascorbic acid to the above solution to control its concentration to 0.5g / L, and stir it magnetically for 10 hours, and then place it in an oven at 80°C to make it fully occur Reduction reaction to form graphene hydrogel with uniform structure;

[0062] (2) Put the graphene hydrogel obtained in step 1 into an electric blast drying oven at 50° C. for drying and dehydration for 12 hours to obtain a porous and loose graphene aerogel with a larger specific surface area;

[0063] (3) get the graphene aerogel obtained in step 2, micron grade tita...

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Abstract

The invention relates to a method for quickly preparing titanium-aluminum-carbon ceramics at room temperature. Graphene oxide is dissolved in deionized water, L-ascorbic acid is added, and after stirring, the temperature is controlled at 80-120°C, and the reduction reaction occurs sufficiently to form graphite with a uniform structure. Graphene aerogel is obtained by drying and dehydrating; the graphene aerogel, titanium powder, and aluminum powder are uniformly mixed; the obtained mixed powder is pressed into a green body, and the platinum sheet is used as an electrode, and the graphite column is used as an additive. Press the contact head and perform flash sintering treatment to obtain dense and uniform titanium-aluminum-carbon ceramics. Compared with the prior art, the present invention uses graphene-assisted flash firing technology to sinter to prepare titanium-aluminum carbon ceramics with high density, high purity and uniform grain size, and the preparation process is simple, high in efficiency and can be completed at room temperature .

Description

technical field [0001] The invention relates to a method for preparing ceramics, in particular to a method for rapidly preparing titanium-aluminum-carbon ceramics at room temperature. Background technique [0002] m n+1 AX n M is a transition group element, such as V, Ti, Ta, etc., A is mainly III or IV group elements, such as Si, Al, Ga, Ge, etc., X is C or N, n=1, 2, 3, 4, 5, they can be referred to as 211 phase (Ti 2 AlC,Cr 2 AlC, Ta 2 AlC, etc.), 312 phase (Ti 3 AlC 2 , Ti 3 SiC 2 ), 413 phases and 523 phases. m n+1 The AXn compound has a similar hexagonal crystal structure, and the spatial structure is P6 3 / mmc. These compounds are thermodynamically stable layered compounds with a wide range of applications. For example, Ti 3 AlC 2 The unit cell parameters are a=b=0.30753nm, c=1.8578nm, and its theoretical density is 4.25g / cm 3 . Ti(1) and Ti(2) occupy 2a and 2f respectively, Al atom is located at 2b position, and C atom is located at 2b (z=0.5701) pos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/56C04B35/626C04B35/65
CPCC04B35/5618C04B35/62605C04B35/65C04B2235/402C04B2235/404C04B2235/425C04B2235/5436C04B2235/5445C04B2235/6581C04B2235/666C04B2235/96
Inventor 郝巍倪娜肖巍伟赵晓峰姜娟范晓慧郭芳威
Owner SHANGHAI JIAOTONG UNIV
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