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A method of low-power plasma spraying that greatly improves the vaporization of flying particles

A plasma and large-scale technology, applied in the direction of coating, fusion spraying, metal material coating process, etc., can solve the problems of low production cost, etc., and achieve the effect of increasing temperature, increasing residence time, and increasing heating degree

Active Publication Date: 2017-04-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a kind of method that greatly improves the low-power plasma spraying of flying particle gasification, to solve the problem that conventional plasma spraying system is difficult to largely gasify YSZ powder under PS-PVD process condition; The inventive method can Greatly improve the gasification degree of powder in the plasma jet, and the process is simple, the production cost is low, and the controllability is good

Method used

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  • A method of low-power plasma spraying that greatly improves the vaporization of flying particles
  • A method of low-power plasma spraying that greatly improves the vaporization of flying particles
  • A method of low-power plasma spraying that greatly improves the vaporization of flying particles

Examples

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Effect test

Embodiment 1

[0041] The aluminum oxide tube is used as the substrate, and it is processed into a sample of Φ16×2×250mm (outer diameter×thickness×length). Use acetone and alcohol to ultrasonically clean the sample in turn, use aluminum oxide sandpaper to polish the surface of the sample, and finally use alcohol to clean the surface of the sample; figure 1 (a) the plasma spray gun of bunching cover, under 100Pa ambient pressure, use 7-8wt.% YSZ powder to carry out PS-PVD process, prepare YSZ coating, wherein spraying parameter is spraying rated power 45kW, removes the net of cooling power Power is 25kW, Ar 40L / min, H 2 8L / min, spraying distance 200mm, powder feeding volume 0.2g / min, side deposition method. The cross-sectional structure of the coating (such as Figure 4 shown) appears as a columnar-like structure. The thickness of the coating with a buncher hood is about twice that of the coating without a buncher hood, which proves that the gasification amount of the powder is significan...

Embodiment 2

[0043] With zirconia as the matrix, it is processed into a sample of Φ18×2mm (diameter×thickness). Use acetone and alcohol to ultrasonically clean the sample in turn, use diamond sandpaper to polish the surface of the sample, and finally use alcohol to clean the surface of the sample; figure 1 (b) Beaming hood and plasma spray gun without beaming hood, under 100Pa ambient pressure, use 7-8wt.% YSZ powder to carry out PS-PVD process, prepare YSZ coating, wherein spraying parameters are spraying rated power 60- 80kW, net power excluding cooling power is 32-45kW, Ar 50-70L / min, H 2 10-15L / min, spraying distance 200-660mm, powder feeding amount 0.2g / min, side deposition method. Coating thicknesses deposited with the addition of a beam mask are significantly increased.

Embodiment 3

[0045] The aluminum oxide tube is used as the substrate, and it is processed into a sample of Φ16×2×250mm (outer diameter×thickness×length). Use acetone and alcohol to ultrasonically clean the sample in turn, use aluminum oxide sandpaper to polish the surface of the sample, and finally use alcohol to clean the surface of the sample; figure 1 (a) The plasma spray gun of the buncher cover, under less than 500Pa ambient pressure, use aluminum oxide powder to carry out PS-PVD process, prepare aluminum oxide coating, wherein spraying parameter is spraying rated power 45-80kW, removes the net of cooling power Power 25-45kW, Ar 40-70L / min, H 2 8-15L / min, spraying distance 200-660mm, powder feeding rate 0.2g / min, side deposition method. Preparation of vapor-deposited columnar structure alumina coating.

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Abstract

The invention discloses a low-power plasma spraying method for substantially improving gasification of flight particles. A spraying system is utilized for plasma spraying, the deposition pressure of a coating is controlled to be less than 500Pa during spraying, a bunching cover is assisted outside a plasma spraying gun, the bunching cover is in a drum shape, one end of the bunching cover is directly connected with a spraying nozzle of the plasma spraying gun through a threaded hole, a horn-shaped channel is formed in the bunching cover, the diameter of the inlet of the horn-shaped channel is 1-5 times of that of the outlet of the spraying nozzle, the inner diameter of the outlet of the horn-shaped channel is larger than or equal to 20 mm, and the length of the horn-shaped channel is 50-150 mm. According to the method, the conventional plasma spraying system is adopted, deposition is carried out under the condition of lower than 500Pa, and the temperature of plasma jet flow central zone is improved by controlling radial dimension of plasma jet flow in the inlet of the spraying gun so as to substantially improve the heated degree of powder in the plasma jet flow to realize more vapor deposition.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of spraying, in particular to a plasma spraying method. [0003] 【Background technique】 [0004] Atmospheric plasma spraying or APS technology for short has the characteristics of high jet temperature, low cost, and fast deposition coating, and has become a common method for preparing YSZ thermal expansion coatings. The coating prepared by this method has a layered structure composed of flat particles. There are pores and cracks between the flat particles, which greatly improves the thermal insulation performance of the coating and reduces its thermal shock resistance. It has many applications in the field of land-based gas turbines where the frequency of temperature changes is not large. [0005] Electron Beam Physical Vapor Deposition, or EB-PVD for short, is a method for preparing columnar YSZ coatings. Using this method, a columnar YSZ layer with regular structure and excellent thermal shock r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/11
Inventor 李长久李成新杨冠军陈清宇
Owner XI AN JIAOTONG UNIV
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