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Method for preparing graphite-titanium low-valence oxide composite material

A technology of titanium low-valent oxides and composite materials, applied in the direction of titanium low-value oxides, titanium oxide/hydroxide, etc., can solve the problem of harsh reaction atmosphere, long reaction process time, and difficult control of physical and chemical properties of reaction products, etc. problems, to achieve the effect of low production equipment and production environment requirements, convenient large-scale industrial production, and excellent electrical conductivity

Active Publication Date: 2017-06-20
攀枝花市弘正钒钛科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of Magnéli phase titanium oxide is mainly based on TiO 2 As a raw material, the current preparation method has disadvantages such as long reaction time, harsh requirements on the reaction atmosphere, and difficulty in controlling the physical and chemical properties of the reaction product.

Method used

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  • Method for preparing graphite-titanium low-valence oxide composite material
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  • Method for preparing graphite-titanium low-valence oxide composite material

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preparation example Construction

[0029] The preparation method of graphite-titanium subvalent oxide composite material comprises the following steps:

[0030] a. TiO 2 Mix with graphite powder at a weight ratio of 1:0.2 to 0.4, and shape to obtain a molding material;

[0031] b. Put the molding material into the crucible, then evenly cover the surface of the molding material with graphite powder, heat it to 1100-1300°C in an air atmosphere, reduce it for 5-40 minutes, then pour it into the graphite powder and cool it to room temperature to obtain the reduced product; Among them, the thickness of the graphite powder covering is ≥0.5cm; the function of covering the graphite powder is to prevent the oxidation of the sample during the reduction process; adding graphite powder for cooling is also to avoid the oxidation of the product during the cooling process.

[0032] c. Crushing the reduced product to obtain a composite material.

[0033] Among them, TiO 2 It can be replaced by metatitanic acid, and the mixi...

Embodiment 1

[0045] Take 100gTiO 2 , 30g graphite (TiO 2 and graphite particle size are all less than 15 μm, impurity content is all less than 1%), after mixing evenly, press into a block, the mixture block is placed in a crucible, and graphite powder is evenly covered on the material surface (graphite powder thickness 0.5cm), and then placed into a high-temperature furnace, under an air atmosphere, at a reduction temperature of 1250°C, and a reduction time of 20 minutes. After reaching the reduction time, the crucible is quickly taken out and the material is poured into graphite powder for protection. After cooling to room temperature, the reduction product is ball-milled to obtain a composite Material. The content of titanium in the composite material is 57.63wt%, the content of oxygen is 34.76%wt, and the content of carbon is 7.61%wt. Product XRD see figure 1 , proving that its phase composition is low-valent titanium oxide and graphite. Product SEM picture see figure 2 , it can b...

Embodiment 2

[0047] Take 100gTiO 2 , 20g graphite (TiO 2 and graphite particle size are all less than 15 μm, and impurity content is all less than 1wt%), after mixing evenly, press into a block, put the mixture block into a crucible, and evenly cover the surface of the material with graphite powder (graphite powder thickness 1cm), and then place In a high-temperature furnace, under an air atmosphere, the reduction temperature is 1250°C, and the reduction time is 10 minutes. After the reduction time is reached, the crucible is quickly taken out and the material is poured into graphite powder for protection. After cooling to room temperature, the reduction product is ball-milled to obtain a composite material . The content of titanium in the composite material is 59.68wt%, the content of oxygen is 35.54wt%, and the content of carbon is 4.78wt%. The particle size of the product is less than 10μm, XRD sees image 3 , proving that its phase composition is low-valent titanium oxide and graphi...

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Abstract

The invention relates to the field of inorganic composite materials and in particular relates to a method for preparing a graphite-titanium low-valence oxide composite material. The preparation method disclosed by the invention mainly comprises the following steps: preparing materials, performing compression molding, performing high-temperature reduction, and performing ball-milling, thereby obtaining the graphite-titanium low-valence oxide (titanium black) composite material. According to the composite powder prepared by the invention, TiO2 (or metatitanic acid) and graphite are mainly taken as raw materials, a carbon thermal reduction method is adopted, and the graphite-titanium low-valence oxide (titanium black) composite material is prepared in an air atmosphere. The method has the characteristics that the process is simple, the requirements on production equipment and production environment are low, the raw materials are low in price and huge in storage capacity, and the process method is convenient for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of inorganic composite materials, in particular to a method for preparing graphite-titanium subvalent oxide (titanium black) composite materials. Background technique [0002] Energy and the environment are two major global issues in the 21st century. In the past 30 years, TiO 2 As a multifunctional material, it plays an important role in both energy and environmental fields. It has been widely used in photocatalytic degradation, dye-sensitized solar cells, and solar hydrogen production. However, the defects of poor conductivity and visible light response limit TiO 2 further application. in TiO 2 Oxygen defects are introduced into the crystal lattice. When the atomic ratio of titanium to oxygen satisfies n:2n-1, the atoms rearrange spontaneously to form an ordered structure and obtain Ti n o 2n -1 series of sub-oxidation state compounds, named Magnéli phase titanium oxide, to commemorate Magnéli's discovery of thi...

Claims

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Application Information

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IPC IPC(8): C01G23/04
CPCC01G23/043
Inventor 吴恩辉李军侯静黄平赖奇徐众刘黔蜀
Owner 攀枝花市弘正钒钛科技有限公司
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