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Production method of molybdenum ditelluride

A technology of molybdenum ditelluride and tellurium powder, which is applied in the direction of binary selenium/tellurium compound, metal selenide/telluride, etc., can solve the problems of high cost, pipeline burst, limited processing capacity, etc., and achieve short production process, To prevent tube bursting, the overall structure of the equipment requires a simple effect

Active Publication Date: 2019-01-11
昆明先导新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Molybdenum ditelluride compounds are usually formed by direct combination of tellurium and molybdenum elements in a sealed vacuum tube at 1100°C. Under high temperature conditions, in order to prevent the volatilization of tellurium from causing component deviation, some excess tellurium can be made, but the excess The vapor pressure of tellurium in a closed system is very high. In order to avoid pipeline bursts, only small batches of production can be used, and the processing capacity is limited and the cost is high.

Method used

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preparation example Construction

[0013] A preparation method of high-purity molybdenum ditelluride, comprising the following steps:

[0014] S1. Mixed materials: select the initial tellurium powder with a purity of 4N or more and a particle size of -200 mesh and an initial molybdenum powder with a purity of more than 4N and a particle size of -325 mesh, and weigh the materials according to the mass ratio of 72.7:27.3, and take the mass of the initial tellurium powder. 1.5-5% additional tellurium powder is placed in a homogenizer together, and mixed for 3-5 hours to form a mixed material;

[0015] S2. Heating synthesis: put the above-mentioned mixing material into a horizontal reaction boat; then put the horizontal reaction boat into the high temperature area of ​​a quartz tube through which the first protective gas flows, and a heat shield is placed at the front end of the quartz tube. A quartz perforated inner cover is placed in the low temperature zone of the quartz tube, the high temperature zone is locate...

Embodiment 1

[0032] Select the initial tellurium powder with a purity of 4N and a particle size of -200 mesh, and an initial molybdenum powder with a purity of 4N and a particle size of -400 mesh. Put them together in a homogenizer and mix for 5h to form a mixed material. Put the above-mentioned mixing material into a horizontal reaction boat; then put the horizontal reaction boat into the high temperature zone of a quartz tube through which 5N nitrogen gas flows, put a heat shield at the front end of the quartz tube, and put a quartz opening in the inner cover. Enter the low temperature area of ​​the quartz tube, the high temperature area is located between the heat shield and the low temperature area, adjust the flow rate of 5N nitrogen to 0.06m 3 / h, sealed quartz tube; the low temperature area is not heated, and the high temperature area is heated to 440 °C in the heating furnace at a heating rate of 500 °C / h for solid phase-solid phase synthesis, and the heating rate is continued at 40...

Embodiment 2

[0034] Select the initial tellurium powder with a purity of 4N and a particle size of -325 mesh and the initial molybdenum powder with a purity of more than 5N and a particle size of -400 mesh, and weigh them according to the mass ratio of 72.7:27.3, and weigh additional tellurium powder with 1.5% of the initial tellurium powder mass , placed together in a homogenizer, mixed for 4 hours to form a mixed material. Put the above-mentioned mixed materials into a horizontal reaction boat; then put the horizontal reaction boat into the high temperature zone of a quartz tube flowing through 5N nitrogen gas, put a heat shield at the front end of the quartz tube, and put a quartz opening inner Into the low temperature area of ​​the quartz tube, adjust the flow rate of 5N nitrogen to 0.02m 3 / h, sealed quartz tube; the low temperature area is not heated, and the high temperature area is heated to 400 °C in the heating furnace at a heating rate of 400 °C / h for solid phase-solid phase syn...

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Abstract

The invention relates to a production method of molybdenum ditelluride. The preparation method comprises the following steps: S1, mixing materials; S2, heating and synthesizing; and S3, low vacuum degree volatilization to remove tellurium. The production method of molybdenum ditelluride is simple in process, short in production flow and great in treatment capacity, and can achieve industrialization. In the synthetic reaction process, the steam pressure of tellurium can be controlled well during batch production in a low pressure production by introducing a flowing protecting air flow to prevent tube explosion, so that safe production is achieved; by adopting a low vacuum degree system, the method is simple in demand on integral structure of equipment and high in product purity. Volatilizedtellurium is collected and recovered, so that the production cost is lowered comprehensively and the environment is protected.

Description

technical field [0001] The invention belongs to the production field of telluride compounds, and in particular relates to a production method of molybdenum ditelluride. Background technique [0002] Molybdenum ditelluride (MoTe 2 ) is a gray hexagonal transition metal tellurium compound, which exists stably in air, is soluble in nitric acid, insoluble in water, decomposes in alkali, can be directly decomposed at high temperature under vacuum conditions, and transforms into Monoclinic. The molybdenum ditelluride monomer is composed of three Te-Mo-Te atomic layers in a covalent bond manner. The two monomers are connected by the van der Waals force between the Te atoms with very low bond energy and the Te atoms. dimensional layered structure, so that the friction between the surfaces of two relatively moving objects can be transformed into the slip between the molybdenum ditelluride monomer and the monomer under low stress load, so that it has excellent lubricating properties...

Claims

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Application Information

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IPC IPC(8): C01B19/04
CPCC01B19/007C01P2006/80
Inventor 刘运连滕飞朱刘王春泉狄聚青赵颂袁静
Owner 昆明先导新材料科技有限责任公司
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