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Method and product for preparing ultra-thin porous WO3 gas-sensitive coating by using thermal spraying technology

A thermal spraying, ultra-thin technology, applied in coating, metal material coating process, fusion spraying, etc., can solve the problem of less gas-sensitive coating preparation, and achieve the convenience of industrial mass production, equipment and process Simple, to avoid the effect of grain growth

Active Publication Date: 2014-04-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method and product for preparing ultra-thin porous WO3 gas-sensitive coating by using thermal spraying technology
  • Method and product for preparing ultra-thin porous WO3 gas-sensitive coating by using thermal spraying technology
  • Method and product for preparing ultra-thin porous WO3 gas-sensitive coating by using thermal spraying technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0042] 1. Use commercially available WCl 6 Add into absolute ethanol and stir evenly, ultrasonically disperse for 20min, add 0.08wt% of the surfactant polyethylene glycol 600 into deionized water, and stir evenly, wherein deionized water and absolute ethanol are in a volume ratio of 1:1, Then add it to WCl 6 in anhydrous ethanol solution, ultrasonically dispersed for 20min 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...

Embodiment 2

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

[0051] 1. Use commercially available WCl 6 Add into absolute ethanol and stir evenly, ultrasonically disperse for 30min, add 0.08wt% surfactant polyethylene glycol 20000 into deionized water, stir evenly, wherein deionized water and absolute ethanol are in a volume ratio of 1:2, Then add it to WCl 6 in anhydrous ethanol solution, ultrasonically dispersed for 30min 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 magne...

Embodiment 3

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

[0060] 1. Use commercially available WCl 6 Add into absolute ethanol and stir evenly, ultrasonically disperse for 40min, add 0.08wt% surfactant cetyl trimethyl ammonium bromide into deionized water, stir evenly, wherein deionized water and absolute ethanol are by volume ratio 1:1 and then add it to WCl 6 in anhydrous ethanol solution, 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 obtai...

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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 the semiconducting metal oxide WO 3 The field of coating technology, in particular to a kind of ultra-thin porous WO prepared by thermal spraying technology 3 Methods and products for gas-sensitive coatings. Background technique [0002] In recent years, the number of motor vehicles in my country has increased sharply, NOx, CO 2 A large number of other gases are emitted, causing 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 extensive attention due to its good sensitivity characteristics. WO 3 The crystal structur...

Claims

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Application Information

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IPC IPC(8): C23C4/10C23C4/12C23C4/11C23C4/129C23C4/134
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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