A method and product for preparing ultra-thin porous Wo3 gas-sensitive coating by thermal spraying technology

A thermal spraying, ultra-thin technology, applied in the coating, metal material coating process, melt spraying and other directions, can solve the problem of less involved in the preparation of gas-sensitive coating, achieve easy industrialized large-scale production, low production cost , to avoid the effect of grain growth

Active Publication Date: 2016-06-08
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, plasma spraying of liquid phase precursors at home and abroad is mainly concentrated in the field of preparation of nano-zirconia thermal barrier coatings. 3 Preparation of gas-sensitive coatings involves less

Method used

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  • A method and product for preparing ultra-thin porous Wo3 gas-sensitive coating by thermal spraying technology
  • A method and product for preparing ultra-thin porous Wo3 gas-sensitive coating by thermal spraying technology
  • A method and product for preparing ultra-thin porous Wo3 gas-sensitive coating by thermal spraying technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, the substrate material is a 304 stainless steel sheet with a thickness of about 2mm, and the substrate surface WO 3 The thickness of the coating is 500nm, and the coating is well combined with the matrix material; the surface of the coating is ultra-thin porous nano-sized WO 3 Grain stacked, WO 3 The grain size ranges from 30 to 100nm. The porous submicron size WO 3 The specific preparation method of the coating is as follows:

[0042] 1. The commercially available WCl 6 Add it into absolute ethanol and stir evenly, ultrasonically disperse for 20min, add 0.08wt% surfactant polyethylene glycol 600 into deionized water, stir evenly, wherein the volume ratio of deionized water and absolute ethanol is 1:1, Then add it to WCl 6 in anhydrous ethanol solution, and ultrasonically dispersed for 20 minutes to obtain WCl 6 A solution with a solid content of 4%, and then adjust the pH of the above solution to 7 with ammonia water under the condition of mag...

Embodiment 2

[0050] In this embodiment, the base material is Al with a thickness of about 1mm 2 o 3 sheet, the substrate surface WO 3 The thickness of the coating is 600nm, and the coating is well combined with the base material; the surface of the coating is ultra-thin porous submicron size WO 3 Grain stacked, WO 3 The grain size ranges from 50 to 150nm. The ultrathin porous submicron size WO 3 The specific preparation method of the coating is as follows:

[0051] 1. The commercially available WCl 6 Add it into absolute ethanol and stir evenly, ultrasonically disperse for 30min, add 0.08wt% surfactant polyethylene glycol 20000 into deionized water, stir evenly, wherein the volume ratio of deionized water and absolute ethanol is 1:2, Then add it to WCl 6 in anhydrous ethanol solution, and ultrasonically dispersed for 30 minutes to obtain WCl 6 A solution with a solid content of 5%, and then adjust the pH of the above solution to 8 with ammonia water under the condition of magnetic ...

Embodiment 3

[0059] In this embodiment, the base material is a slide glass with a thickness of about 1mm, and the surface of the base body is WO 3 The thickness of the coating is 500nm, and the coating is well combined with the matrix material; the surface of the coating is ultra-thin porous nano-sized WO 3 Grain stacked, WO 3 The grain size ranges from 20 to 100nm. The loose porous WO 3 The specific preparation method of the coating is as follows:

[0060] 1. The commercially available WCl 6 Add it into absolute ethanol and stir evenly, ultrasonically disperse for 40min, add 0.08wt% surfactant cetyltrimethylammonium bromide into deionized water, stir evenly, wherein deionized water and absolute ethanol Ratio 1:1, then add it to WCl 6 in anhydrous ethanol solution, and ultrasonically dispersed for 40min to obtain WCl 6 A solution with a solid content of 7%, and then adjust the pH of the above solution to 7 with ammonia water under the condition of magnetic stirring to obtain ultra-th...

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Abstract

The invention discloses a method and a product for preparing an ultra-thin porous WO3 gas-sensitive coating by using a thermal spraying technology. The preparation method comprises the following steps: (1) preparing a WC16 liquid-phase precursor; (2) cleaning a substrate, degreasing, derusting and carrying out surface roughening treatment; (3) feeding the WC16 liquid-phase precursor prepared in the step (1) to thermal spraying equipment, and carrying out high-temperature reaction, drying, burning, coagulation and sedimentation on the surface of the substrate so as to obtain the ultra-thin porous WO3 gas-sensitive coating. The preparation method disclosed by the invention has the advantages of simple operation, fewer technological processes, low cost, applicability to industrial production and the like, and the prepared WO3 gas-sensitive coating has an ultra-thin porous submicrometer structure, and has excellent gas sensitivity, and the thickness is 500nm to 1mu m.

Description

technical field [0001] The present invention relates to semiconducting metal oxide WO 3 The field of coating technology, especially relates to a method of preparing ultra-thin porous WO by thermal spraying technology 3 Gas-sensitive coating method and product. Background technique [0002] In recent years, the number of motor vehicles in my country has increased sharply, and NOx, CO 2 A large amount of emissions such as gases have caused air pollution, acid rain and the greenhouse effect. Therefore, people's requirements for environmental monitoring are getting higher and higher, and it is urgent to develop sensors and related equipment for efficient monitoring of toxic and harmful gases. WO 3 As a transition metal oxide semiconductor material, it has excellent gas-sensing properties, because it is sensitive to certain gases (such as O 3 , CO, NO 2 , NO, NH 3 、H 2 S) has received widespread attention due to its good sensitivity. WO 3 The crystal structure of the di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/11C23C4/134C23C4/129
Inventor 武庆飞黄晶任坤卢少阳贺小燕陈秀勇刘奕李华
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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