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A kind of preparation method of molybdenum carbide material not containing non-stoichiometric ratio carbon

A non-stoichiometric ratio, molybdenum carbide technology, applied in the direction of tungsten/molybdenum carbide, carbide, etc., can solve the problem of difficult control of carbon content, and achieve the effect of fast process, uniform particle size and cheap raw materials

Active Publication Date: 2015-07-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solid carbon used must be in excess (the molar ratio of carbon to molybdenum is greater than 3), so the carbon content in the molybdenum carbide system is difficult to control, and there is usually a large amount of free carbon

Method used

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  • A kind of preparation method of molybdenum carbide material not containing non-stoichiometric ratio carbon
  • A kind of preparation method of molybdenum carbide material not containing non-stoichiometric ratio carbon
  • A kind of preparation method of molybdenum carbide material not containing non-stoichiometric ratio carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Add 10g of melamine to 1000mL of water, o Stir at a temperature of C until the melamine powder is completely dissolved to prepare a melamine aqueous solution;

[0018] (2) Add 20g of ammonium molybdate to 500mL of water. o Stir at a temperature of C until the ammonium molybdate powder is completely dissolved to prepare an ammonium molybdate aqueous solution;

[0019] (3) Stir and mix the melamine aqueous solution and the ammonium molybdate aqueous solution to obtain a white precipitate. The white precipitate was collected by filtration and filtered at 120 o Dry at a temperature of C;

[0020] (4) Put the dried white solid into a tube furnace, and mix it in an argon-hydrogen mixture with an argon flow rate of 50 mL / min and a hydrogen flow rate of 20 mL / min. o The heating rate of C / min rises to 650 o C. Maintain the temperature for 1 hour, turn off the gas, and obtain molybdenum carbide after natural cooling.

Embodiment 2

[0022] (1) Add 10g of melamine to 1000mL of water, o Stir at a temperature of C until the melamine powder is completely dissolved to prepare a melamine aqueous solution;

[0023] (2) Add 20g of ammonium molybdate to 500mL of water. o Stir at a temperature of C until the ammonium molybdate powder is completely dissolved to prepare an ammonium molybdate aqueous solution;

[0024] (3) Stir and mix the melamine aqueous solution and the ammonium molybdate aqueous solution to obtain a white precipitate. The white precipitate was collected by filtration and filtered at 120 o Dry at a temperature of C;

[0025] (4) Put the dried white solid into a tube furnace, and add 5 o The heating rate of C / min rises to 650 o C. Maintain the temperature for 1 hour, turn off the gas, and obtain molybdenum carbide after natural cooling.

Embodiment 3

[0027] (1) Add 10g of melamine to 500mL of ethylene glycol, o Stir at a temperature of C until the melamine powder is completely dissolved to prepare a melamine glycol solution;

[0028] (2) Add 20g of ammonium molybdate to 500mL of water. o Stir at a temperature of C until the ammonium molybdate powder is completely dissolved to prepare an ammonium molybdate aqueous solution;

[0029] (3) Stir and mix the melamine glycol solution and the ammonium molybdate aqueous solution to obtain a white precipitate. The white precipitate was collected by filtration and filtered at 120 o Dry at a temperature of C;

[0030] (4) Put the dried white solid into a tube furnace, and mix it in an argon-hydrogen mixture with an argon flow rate of 50 mL / min and a hydrogen flow rate of 20 mL / min. o The heating rate of C / min rises to 650 o C. Maintain the temperature for 1 hour, turn off the gas, and obtain molybdenum carbide after natural cooling.

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Abstract

The invention discloses a method for manufacturing a molybdenum carbide material containing non-stoichiometric carbon. The method includes collecting sediments generated after molybdenum acid aqueous solution and melamine solution are mixed; and drying the sediments and performing one-step pyrolysis for the sediments to obtain molybdenum carbide. The method has the advantages that raw materials are cheap and readily available; the method for manufacturing molybdenum acid and melamine compounds is speedy and simple, hydrocarbon gas and excessive solid carbon are omitted in a pyrolysis procedure, and pyrolysis conditions are mild; and the manufactured molybdenum carbide is uniform in granularity and does not contain free carbon, surfaces of molybdenum carbide grains are clean, the content of carbon of the molybdenum carbide is low and is close to a stoichiometric ratio, and the method is applicable to manufacturing cutters, molds, coatings and abrasion-resistant, high-temperature-resistant and chemical-resistant materials.

Description

Technical field [0001] The invention relates to a method for preparing transition metal carbide materials. Specifically, a one-step pyrolysis method is used to convert the complex composed of (molybdic acid) and melamine into molybdenum carbide. Background technique [0002] Transition metal carbides such as molybdenum carbide (Mo 2 C) It is a kind of material with important application value in many industrial fields. When molybdenum carbide is used to manufacture products that have high requirements for mechanical strength and hardness, such as molds, knives and drilling tools, as well as various high temperature, friction and chemical resistance products, its free carbon content should be low and the particles Uniform diameter. The ideal molybdenum carbide should not contain excess carbon other than the stoichiometric carbon (5.88% by weight). The presence of free carbon will reduce the strength, hardness and chemical resistance of molybdenum carbide. When molybdenum carbid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/34C01B32/949
Inventor 梁长海庞敏李闯郭小玲张明明
Owner DALIAN UNIV OF TECH
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