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Preparation method of composite photocatalytic coating and prepared composite photocatalytic coating

A composite photocatalysis and coating technology, which is applied in the field of preparation of composite photocatalytic coatings, can solve the problems of low preparation efficiency, large equipment cost, large-scale special equipment, etc., and achieve the effect of enhancing photocatalytic function.

Inactive Publication Date: 2019-04-12
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Whether it is physical vapor deposition, chemical vapor deposition, or other methods such as direct oxidation, sol-gel method, and hydrothermal method, there are various problems in the process of preparing titanium dioxide thin films, such as: physical vapor deposition method Both chemical vapor deposition and chemical vapor deposition methods require large-scale special equipment, and some also require vacuum environment and heating conditions; while the process of direct oxidation method takes a long time, and the process of sol-gel method and hydrothermal method is cumbersome.
In a word, in the process of preparing titanium dioxide film or coating, the above-mentioned preparation process either requires a large investment in equipment cost or low production efficiency, which increases the preparation cost of titanium dioxide film or coating, and plays a role in the practical application of titanium dioxide. very restrictive

Method used

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  • Preparation method of composite photocatalytic coating and prepared composite photocatalytic coating
  • Preparation method of composite photocatalytic coating and prepared composite photocatalytic coating
  • Preparation method of composite photocatalytic coating and prepared composite photocatalytic coating

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Main equipment: 1 planetary ball mill, 1 heat treatment furnace

[0061] Main raw materials and process parameters: micron TiC powder (2-5 microns), Al 2 O 3 Ceramic balls (average particle size 1-5 mm), the mass percentage of the two ranges from 40% to 50% and 60% to 50%, the total volume of the two occupies 20%-50% of the volume of the ball mill tank; planetary ball mill revolution The speed is 100 to 600 revolutions per minute, and the ball milling time is 1 to 20 hours.

[0062] Preparation of TiC coating:

[0063] Combine the above TiC powder and Al 2 O 3 The ceramic balls are mixed and put into a ball mill tank according to the mass ratio, and then ball milled on a planetary ball mill. The centrifugal force generated by the ball mill makes the TiC powder and Al 2 O 3 The ceramic balls collide and friction with the inner wall of the ball mill. Under the impact and friction, the TiC powder can be in Al 2 O 3 The surface of the ceramic ball adheres. After a certain period o...

Embodiment 2

[0072] Mechanical coating: 60g of Al with a diameter of 1mm 2 O 3 Ceramic balls and 40g TiC powder with a particle size of 2~5μm are filled into 250ml Al 2 O 3 Put the ball mill on a planetary ball mill for mechanical coating. The revolution speed of the ball mill is set to 480r / min and the time is set to 10 hours.

[0073] Heat treatment:

[0074] Group C-1073K: The prepared Al coated with TiC coating 2 O 3 Ceramic balls are divided equally according to Image 6 The method shown is placed in a muffle furnace for heat treatment, the heat treatment temperature is set to 1073K, the heating rate is 30K / min, and the maintenance time is 15 hours. After the furnace is cooled to room temperature, the sample is taken out to complete the sample preparation;

[0075] O-1073K group: the prepared Al coated with TiC coating 2 O 3 The ceramic balls are directly heat-treated in the atmosphere. The heat-treatment temperature is 1073K, the heating rate is 30K / min, and the maintenance time is 15 hours....

Embodiment 3

[0086] Mechanical coating: 50g of Al with a diameter of 7-10mm 2 O 3 Ceramic balls and 50g of TiC powder with a particle size of 5-9μm are filled into 250ml of Al 2 O 3 Put the ball mill jar on a planetary ball mill for mechanical coating. The revolution speed of the ball mill is set to 500r / min and the time is set to 8 hours.

[0087] Heat treatment:

[0088] Group C-1073K: The prepared Al coated with TiC coating 2 O 3 Ceramic balls are divided equally according to Image 6 The method shown is placed in a muffle furnace for heat treatment, the heat treatment temperature is set to 1273K, the heating rate is 35K / min, and the maintenance time is 12 hours. After the furnace is cooled to room temperature, the sample is taken out to complete the sample preparation;

[0089] O-1073K group: the prepared Al coated with TiC coating 2 O 3 The ceramic balls are directly heat-treated in the atmosphere. The heat-treatment temperature is 1273K, the heating rate is 35K / min, and the maintenance time ...

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Abstract

The present invention relates to the field of composite photocatalytic coatings, and in particular to a preparation method of the composite photocatalytic coating and the prepared composite photocatalytic coating. A method for preparing a composite photocatalytic coating, including the following steps: the coating material is ball milled to coat the substrate to obtain a coated body; the coated body is maintained at a temperature of 973K to 1273K for 2 to 15 hours ;The matrix is ​​Al 2 O 3 Any one or more of ceramic bodies, metal bodies, and alloy bodies; the coating material is any one or more of TiC powder, titanium dioxide powder, metal powder, and alloy powder. The composite photocatalytic coating provided by the invention has significant changes in the coating microstructure and even the atomic and electronic structure formed during the mechanical coating process; during thermal oxidation, a series of physical and chemical changes occur, forming a unique The photocatalytic function of the microstructured functional coating is significantly enhanced.

Description

Technical field [0001] The invention relates to the field of composite photocatalytic coatings, in particular to a method for preparing composite photocatalytic coatings and the prepared composite photocatalytic coatings. Background technique [0002] Titanium dioxide photocatalyst has a series of characteristics such as high catalytic performance, stable chemical properties, non-toxicity and low price, and has shown broad application prospects in the fields of air purification, water purification, self-cleaning, antibacterial and anti-virus. Although the large specific surface area of ​​the nanoparticles can greatly improve the photocatalytic performance per unit weight, the poor gas permeability and the high cost of subsequent recycling and reuse have greatly restricted the application of titanium dioxide nanopowders. Therefore, the application research of photocatalysis tends to fix titanium dioxide on the substrate, such as thin film / coating. [0003] The preparation methods o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J23/755B01J23/80B01J23/889B01J27/22B01J37/02B01J37/08
CPCB01J21/063B01J23/755B01J23/80B01J23/8892B01J27/22B01J37/0217B01J37/0232B01J37/08B01J35/39
Inventor 郝亮鲁云关苏军
Owner TIANJIN UNIV OF SCI & TECH
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