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Method for preparing nano molybdenum carbide (Mo2C) flake powder with regular-hexagon structure

A nanometer molybdenum carbide, regular hexagonal structure technology, applied in the direction of tungsten/molybdenum carbide, nanotechnology for material and surface science, carbide, etc., can solve practical application inconvenience, irregular shape particle size distribution range, the reaction product is heated internally and externally, etc., to achieve the effect of convenient operation, less impurity content, and reduced energy consumption

Active Publication Date: 2016-01-06
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In these methods, there are some insurmountable problems, such as 1) the synthesis process is usually in a vacuum, or H 2 , Ar and other protective atmospheres; 2) The heat required for carbothermal reduction is mainly provided by the radiation heat transfer of the heating element, and the reaction product is heated unevenly inside and outside; 3) The synthesized Mo 2 C powdery substance with irregular shape and wide particle size distribution, which brings a lot of inconvenience to practical application

Method used

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  • Method for preparing nano molybdenum carbide (Mo2C) flake powder with regular-hexagon structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare the nano-molybdenum carbide flake powder with regular hexagonal structure as follows, specifically comprising the following steps:

[0026] 1) Dissolve 28.61g of ammonium dimolybdate and 21.39g of glucose in 250ml of distilled water, and stir until completely dissolved to obtain a precursor solution;

[0027] 2) Put the precursor solution obtained in step 1) in a blast drying oven, and dry it at 60°C for 5 hours to obtain a powdery precursor mixture;

[0028] 3) Put the powdery precursor mixture obtained in step 2) in a quartz tube furnace, and calcinate at 300°C for 1 hour under the protection of argon to obtain a "molybdenum oxide" in which the elements are uniformly mixed at the molecular weight level — carbon” mixture;

[0029] 4) Take the "molybdenum oxide-carbon" mixture obtained in step 3) to fill 1 / 2 of the volume of the ceramic crucible, and cover and fill the upper layer of the crucible with NaCl and KCl mixed powder with a molar ratio of 1:1; then pl...

Embodiment 2

[0032] Prepare the nano-molybdenum carbide flake powder with regular hexagonal structure as follows, specifically comprising the following steps:

[0033] 1) Dissolve 30.39g of ammonium dimolybdate and 19.61g of sucrose in 250ml of distilled water, and stir until completely dissolved to obtain a precursor solution;

[0034] 2) Put the precursor solution obtained in step 1) in a blast drying oven, and dry it at 80°C for 4 hours to obtain a powdery precursor mixture;

[0035]3) Put the powdery precursor mixture obtained in step 2) in a quartz tube furnace, and calcinate at 300°C for 1 hour under the protection of argon to obtain a "molybdenum oxide" in which the elements are uniformly mixed at the molecular weight level — carbon” mixture;

[0036] 4) Take the "molybdenum oxide-carbon" mixture obtained in step 3) to fill 1 / 3 of the volume of the ceramic crucible, and use NaCl and BaCl with a molar ratio of 1:1 2 The mixed powder covers and fills the upper layer of the crucible;...

Embodiment 3

[0039] Prepare the nano-molybdenum carbide flake powder with regular hexagonal structure as follows, specifically comprising the following steps:

[0040] 1) Dissolve 27.94g of ammonium heptamolybdate and 22.06g of glucose in 250ml of distilled water, and stir until completely dissolved to obtain a precursor solution;

[0041] 2) Place the precursor solution obtained in step 1) in a blast drying oven, and dry it at 100°C for 3 hours to obtain a powdery precursor mixture;

[0042] 3) Put the powdery precursor mixture obtained in step 2) in a quartz tube furnace, and calcined at 400°C for 0.5h under the protection of argon to obtain a "oxidized Molybdenum - carbon" mixture;

[0043] 4) Take the "molybdenum oxide-carbon" mixture obtained in step 3) and fill 1 / 2 of the volume of the ceramic crucible, and cover and fill the upper layer of the crucible with KCl powder; then place the crucible in a quartz tube furnace, in a hydrogen atmosphere at At 800°C for 3 hours for reduction ...

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Abstract

The invention relates to a method for preparing nano molybdenum carbide (Mo2C) flake powder with a regular-hexagon structure. According to the method, water-soluble ammonium dimolybdate (or ammonium heptamolybdate) and glucose (or saccharose) are respectively adopted as a molybdenum source raw material and a carbon source raw material; and through precursor solution drying, molecular-level uniform mixing of all elements in a reactant system is realized, the temperature for carbothermal reduction reaction is lowered, the reaction time for the carbothermal reduction reaction is shortened, and the synthesis of nano Mo2C is realized. In addition, during the reaction, a molten halogenating agent provides a uniformly-heated stable-state system for a reaction system, so that the homogeneous growth of regular-hexagonal nano flaky Mo2C is promoted.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic non-metallic powder materials, and in particular relates to a preparation method of nanomolybdenum carbide powder with regular hexagonal sheet structure. Background technique [0002] Molybdenum carbide (Mo 2 C) Because of its high melting point, high hardness, good electrical and thermal conductivity and good corrosion resistance, it has been widely used in various fields of high temperature resistant, wear resistant and chemical corrosion resistant materials. Mo 2 C is often added as a second phase to iron and steel materials to improve the wear resistance of the workpiece, and can also be added as an important component to WC-based cemented carbide and Ti(C,N)-based cermet systems to improve microstructure and mechanics. performance. In addition, it can also be used alone to make wear-resistant and anti-scratch coatings. Mo 2 C is also known as a "quasi-platinum catalyst" because ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/34B82Y30/00B82Y40/00C01B32/949
Inventor 金永中曾宪光陈昌浩附青山苏晓慧
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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