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Preparation method and application of novel nitrogen-containing MAX phase material and two-dimensional material

A two-dimensional material and a new technology, applied in the field of preparation of new nitrogen-containing MAX phase materials and two-dimensional materials, can solve the problems of inability to prepare medium-entropy or high-entropy MAX phase materials, and achieve easy industrial scale-up production, low cost, The effect of simple process

Active Publication Date: 2022-03-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when this method is used to prepare nitrogen-containing medium-entropy or high-entropy MAX phase materials, when four or more than five transition metal elements need to be added, the transition metal element elements are prone to react with nitrogen-containing raw materials to form rock salt in a high-temperature environment. structure of transition metal nitride particles, so that it is impossible to prepare homogeneous medium-entropy or high-entropy MAX phase materials

Method used

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  • Preparation method and application of novel nitrogen-containing MAX phase material and two-dimensional material
  • Preparation method and application of novel nitrogen-containing MAX phase material and two-dimensional material
  • Preparation method and application of novel nitrogen-containing MAX phase material and two-dimensional material

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Experimental program
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Embodiment approach

[0028] (1) React with the nitride of A, the simple substance or compound of four or more transition metals, and the simple substance or compound of A as raw materials to prepare a nitrogen-containing medium-entropy or high-entropy MAX phase material, and A is selected from VIIB, VIII, At least one of group IB, IIB, IIIA, IVA, VA and VIA elements. The mechanism of the reaction is explained as follows: the nitride of A reacts with the simple substance or carbide of the transition metal to form a nitrogen-containing MAX phase material, and then the nitrogen-containing MAX phase material is used as the skeleton, and the remaining transition metal simple substance or carbide Transition metal elements, under high temperature conditions, infiltrate the nitrogen-containing MAX phase material to obtain a nitrogen-containing high-entropy MAX phase material; or, the nitride of A reacts with several transition metal elements or carbides to form several Nitrogen-containing MAX phase materi...

Embodiment 1

[0037] The invention provides a method for preparing nitrogen-containing high-entropy MAX phase (Ti 0.2 Nb 0.2 Ta 0.2 Zr 0.2 V 0.2 ) 2 AlC 0.5 N 0.5 The preparation method comprises steps:

[0038] Ingredients step: according to the chemical formula of high entropy MAX phase (Ti 0.2 Nb 0.2 Ta 0.2 Zr 0.2 V 0.2 ) 2 AlC 0.5 N 0.5 The middle stoichiometric ratio (molar ratio) adopts Ti, Nb, Ta, V, Zr, AlN, Al and graphite as raw material precursors, and its molar ratio is Ti:Nb:Ta:V:Zr:AlN:Al:C= 0.4:0.4:0.4:0.4:0.4:1:0.2:1, accurately weigh each raw material precursor according to the corresponding molar ratio;

[0039] Grinding step: Put the above-mentioned raw materials into a ball mill tank for ball milling. The speed of ball milling is 600rpm, and the milling time is 20h. After the ball milling, the mixed powder is placed in a powder tablet mold for cold pressing. 20MPa, pressurization time is 5min;

[0040] Sintering step: transfer the ball-milled block to a ...

Embodiment 2

[0043] The invention provides a method for preparing nitrogen-containing high-entropy MAX phase (Ti 0.2 Nb 0.2 Ta 0.2 Zr 0.2 V 0.2 ) 2 AlC 0.5 N 0.5 The preparation method comprises steps:

[0044] Ingredients step: according to the chemical formula of the nitrogen-containing high-entropy MAX phase (Ti 0.2 Nb 0.2 Ta 0.2 Zr 0.2 V 0.2 ) 2 AlC 0.5 N 0.5 The medium stoichiometric ratio (molar ratio) uses Ti, Nb, Ta, V, Zr, TiC, NbC, TaC, VC, ZrC, AlN and Al as raw material precursors, and its molar ratio is Ti:Nb:Ta:V: Zr:TiC:NbC:TaC:VC:ZrC:AlN:Al=0.3:0.3:0.3:0.3:0.3:0.1:0.1:0.1:0.1:0.1:0.5:0.7, accurately weigh each raw material precursor according to the corresponding molar ratio body;

[0045]Grinding step: Put the above-mentioned raw materials into a ball mill tank for ball milling. The speed of ball milling is 600rpm, and the milling time is 20h. After the ball milling, the mixed powder is placed in a powder tablet mold for cold pressing. 20MPa, pressurizatio...

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Abstract

The invention discloses a preparation method and application of a novel nitrogen-containing MAX phase material and a two-dimensional material, and the preparation method of the novel nitrogen-containing MAX phase material comprises the following steps: taking a nitride of A, simple substances or compounds of more than four transition metals, and simple substances or compounds of A as raw materials for reaction, or carrying out a reaction on the raw materials to obtain the two-dimensional material. A nitride of A, an elementary substance or a compound of at least one transition metal and a nitrogen-free M 'AX phase material are used as raw materials for reaction, more than four types of elements in the transition metal and M' are used, and the nitrogen-containing novel MAX phase material is prepared. The preparation method disclosed by the invention is simple in process, low in cost and easy for industrial enlarged production, and lays a foundation for application of nitrogen-containing medium-entropy or high-entropy MAX phase materials and two-dimensional materials.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 202110560245.X and the title of the invention "Preparation method and application of nitrogen-containing novel MAX phase material and two-dimensional material" submitted to the Chinese Patent Office on May 21, 2021, The content of this application is incorporated herein by reference. technical field [0002] The invention relates to the field of new materials, in particular to a preparation method and application of a nitrogen-containing novel MAX phase material and a two-dimensional material. Background technique [0003] Layered transition metal carbides, nitrides and carbonitrides (MAX phase) have a rich chemical composition with the formula M n+1 AX n , M represents early transition metal elements such as Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W, etc., and A is mainly group 13-16 elements such as Al, Si, P and S, etc. X represents C and / or N elements. In the MAX...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626C01B21/082B82Y40/00
CPCC04B35/58007C04B35/62605C01B21/0828B82Y40/00C04B2235/404C04B2235/3865C04B2235/425C04B2235/3843C04B2235/3839C04B2235/402C01P2004/64C01P2004/24
Inventor 杨树斌杜志国
Owner BEIHANG UNIV