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A 211 phase m n+1 ax n Compounds and methods for their preparation

A compound, the technology of 1axn, applied in the field of chemical preparation, can solve the problems of increasing the workload of synthesizing MXenes, long synthesis time, unsuitable for promotion, etc., and achieve the effect of facilitating scientific research promotion and industrialization, low equipment price and low production cost

Active Publication Date: 2022-06-21
SICHUAN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ti 2 The preparation process of AlC is traditionally synthesized by TiC:Al:C sintering at a certain molar ratio, which takes a long time and seriously increases the workload of synthesizing MXenes, such as pressureless sintering; rapid synthesis methods such as combustion synthesis (SHS), which may cause dislocation and faulting due to the state of synthesis or rapid reaction
All in all, the current synthesis technology either takes a long time to synthesize so that the efficiency is low, or requires harsh experimental equipment and cumbersome operation procedures, which greatly limits the synthesis of MAX, and only a few laboratories can achieve this condition, so it is not suitable for promotion, not to mention industrialized production

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  • A 211 phase m <sub>n+1</sub> ax <sub>n</sub> Compounds and methods for their preparation
  • A 211 phase m <sub>n+1</sub> ax <sub>n</sub> Compounds and methods for their preparation
  • A 211 phase m <sub>n+1</sub> ax <sub>n</sub> Compounds and methods for their preparation

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preparation example Construction

[0033] The present invention also provides a 211 phase M n+1 AX n The preparation method of the compound mainly adopts magnetic field heating, has short time consumption and low energy consumption, and can realize the macro-scale preparation of gram-level compounds. Specifically, the preparation method comprises the following steps:

[0034] S100: Mix a certain proportion of M element powder, A element powder and X element powder; the particle size of the M element powder, A element powder and X element powder is not greater than 100 microns. In this step, it is best to mix the M element powder, A element powder and X element powder evenly; a ball mill can be used to mix, that is, the M element powder, A element powder and X element powder are ball-milled in a vacuum ball mill for a certain period of time, and the ball milling time can be 5min to 60min; the vacuum ball mill is used to avoid oxidation of M element powder, A element powder and X element powder.

[0035] S200:...

Embodiment 1

[0049] (1) Accurately weigh 11.5366g of titanium powder, 3.2428g of aluminum powder, and 1.2355g of carbon powder respectively, put them in a vacuum ball mill and vacuumize them, and then use a ball mill for 5 minutes, and mix them evenly;

[0050] (2) Take the mixed powder after ball milling and press it into a cuboid block solid with a hydraulic press;

[0051] (3) Put the pressed block solid and the graphite sheet together in an alumina crucible, and the graphite sheet is placed under the block solid; for the convenience of placing and taking out the block solid, an alumina crucible is used in this embodiment; Crucibles or containers made of other materials can also be used; crucibles can also be omitted, as long as the solid block and the heating source can be fixed in the magnetic field;

[0052] (4) Put the alumina crucible containing the block solid and graphite sheet in the middle of the magnetic induction coil in the magnetic levitation melting furnace;

[0053] (5) ...

Embodiment 2

[0057] (1) Accurately weigh 11.5278g of titanium powder, 3.3698g of silicon powder, and 1.2298g of carbon powder, respectively, and put the weighed powder into a vacuum ball mill for ball milling for 30 minutes to mix the powder evenly;

[0058] (2) Take the powder of a certain quality after the above ball milling and press it into a cube-shaped solid with a hydraulic press;

[0059] (3) Put the pressed block solid and graphite paper in a quartz crucible;

[0060] (4) Place the quartz crucible containing the block solid and graphite paper in the middle of the magnetic induction coil in the magnetic levitation melting furnace;

[0061] (5) Use a vacuum pump to evacuate the hearth of the maglev smelting furnace, and then clean it with argon for four times and pump it to a vacuum again so that the absolute pressure of the hearth of the maglev smelting furnace is less than 0.05MPa;

[0062] (6) Adjust the temperature of the magnetic suspension melting furnace to 800°C for sinteri...

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Abstract

The invention provides a 211 phase M n+1 AX n compound, the 211 phase M n+1 AX n The compound has a stacked layered structure; the 211 phase M n+1 AX n The single-layer thickness of the compound is 1nm~100nm, wherein M is a transition metal, A is a IIIA or IVA group element, X is C or N; n is a natural number. The invention also provides a preparation method of the 211-phase compound. M of the layered morphology of the stacks of the present invention n+1 AX n The compound is more favorable for etching, and it is convenient to obtain MXene. The preparation method of the present invention is simple, and the equipment price is low. Compared with the existing physical preparation process, it does not need expensive electronic equipment and complicated operation process, and the production cost is very low.

Description

technical field [0001] The invention relates to the field of chemical preparation, in particular to a 211 phase M n+1 AX n compound. Background technique [0002] In the past decade, a class of ternary carbide and nitride ceramic materials with a layered structure has been highly valued by material researchers. These compounds can be represented by a unified chemical formula M. n+1 AX n represents, where M is a transition metal, A is mainly a group IIIA or IVA element, and X is C or N. 211 phase titanium aluminum carbon is the best among them, this kind of material has the comprehensive properties of metals and ceramics, such as good thermal conductivity and electrical conductivity, low Vickers hardness and shear modulus, high Young's modulus, high melting point , Very good thermal shock resistance, machinability, high yield strength, plasticity at high temperature, high thermal stability and good oxidation (corrosion) performance. [0003] There are many synthetic meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/90
Inventor 黄青松伍超众刘强
Owner SICHUAN UNIV
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