Thin-shell structure zirconium oxide powder for thermal spraying

A technology of zirconia powder and thin shell structure, which is applied in coating, fusion spraying, metal material coating process, etc., can solve the difficulty of heat protection of non-spraying parts of the workpiece, the increase of nozzle and electrode consumption speed, and the decrease of production cost Advanced problems, to achieve the effect of increasing contact heat transfer area, reducing spraying power and improving production efficiency

Inactive Publication Date: 2018-02-27
苏州炻原新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method can solve the problem of powder melting, it also brings the following disadvantages: (1) when the mass of powder particles is small, and the powder sent into the high temperature area is severely burned; (2) in order to ensure that the powder is fully melted , to prevent the presence of "cooked powder" in the coating, generally use a lower powder feed rate, resulting in low production efficiency and easy thermal stress in the coating
Especially when spra

Method used

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  • Thin-shell structure zirconium oxide powder for thermal spraying
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Experimental program
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Effect test

Embodiment 1

[0018] Using the thin shell structure yttrium oxide partially stabilized zirconia powder of the present invention and the commercially available zirconia powder, the zirconia high-temperature thermal insulation coating was prepared under the same equipment to compare its process performance and final coating performance.

[0019] The thin-shell structure zirconia powder of the present invention has a wall thickness of about 8% of its outer diameter, and the commercially available zirconia powder is Metco 204NS, and the spraying equipment adopted is Metco 9MB plasma spraying equipment, and the spraying process parameters adopted are as follows: , the best spraying parameters obtained through orthogonal experiment optimization. The spraying parameters used and the typical coating performance comparison are shown in Table 1 below:

[0020] Table 1 Comparison of spraying process parameters and coating properties of the two powders

[0021]

[0022] Note 1: The bonding strength...

Embodiment 2

[0026] The thin-shell structure yttria partially stabilized zirconia ceramic powder of the present invention has a wall thickness of about 3% of its outer diameter. A commercially available oxyacetylene flame spray gun was used to prepare the thermal insulation coating, and the spraying parameters were optimized through orthogonal experiments. The spraying parameters and typical coating properties used are shown in Table 2 below:

[0027] Table 2 Oxyacetylene flame spraying process parameters and coating properties of thin shell structure zirconia powder

[0028]

[0029] It can be seen from the above table that the zirconia thermal insulation coating can be prepared by using the ordinary oxyacetylene flame spray gun and the thin-shell structure zirconia powder of the present invention, which not only has low equipment cost, but also has lower thermal conductivity. rate, and its heat insulation effect is better. The low thermal conductivity of the coating is mainly due to ...

Embodiment 3

[0031] Using the zirconia powder containing ytterbium oxide, gadolinia and yttrium oxide in the thin shell structure of the present invention, its wall thickness is about 8.7% of its outer diameter, compared with the zirconia powder of ytterbium oxide, gadolinia and yttrium oxide in the traditional structure Coating properties. The spraying equipment used is Metco 9MB plasma spraying equipment, and the spraying process parameters used are the best spraying parameters obtained through orthogonal experiment optimization. The comparison of spraying parameters and typical coating performance is shown in Table 3 below:

[0032] Table 3 Comparison of spraying process parameters and coating properties of the two powders

[0033]

[0034] It can be seen from the above table that compared with the traditional powder, the use of the thin-shell structure powder of the present invention has obvious advantages in terms of spraying power, production efficiency (powder feeding rate), and...

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Abstract

The invention provides a thin-shell structure zirconia powder for thermal spraying, the powder particles have a thin-shell spherical or nearly spherical hollow structure similar to a table tennis ball, and the wall thickness of the particles is less than 10% of its outer diameter; due to the thin-shell structure oxidation Zirconium powder is easier to melt. When plasma spraying is used, under the same powder feeding rate, the spraying power can be reduced by more than 40%, and the service life of nozzles, electrodes and other components can be extended by more than 50%; under the same spraying power condition The production efficiency (powder feeding amount) can be increased by more than 40%; using the thin-shell structure zirconia powder of the present invention, the flame spraying process can also be used to prepare zirconia coating. The equipment cost of flame spraying is about one-tenth of that of plasma spraying equipment. At the same time, it has the characteristics of low operating cost, small size, and can be easily transported to the product site for coating construction.

Description

technical field [0001] The invention belongs to the field of ceramic coating materials, in particular to a thin shell structure zirconia powder for thermal spraying. Background technique [0002] Zirconia coating has a high melting point, extremely low thermal conductivity and good chemical corrosion resistance, etc., and is often used for thermal protection of working parts at high temperatures. According to different temperatures, zirconia has three different phase structures: monoclinic, tetragonal and cubic, and the three different phases are accompanied by large volume changes during the process of mutual transformation. Therefore, in the application process, usually according to In the environment of its application, phase stabilizers such as yttrium oxide, magnesium oxide, calcium oxide, cerium oxide, etc. are mixed into zirconia to inhibit the phase transition and prevent the volume change during the phase transition from causing the coating to crack. [0003] Com...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/11
CPCC23C4/134C23C4/11
Inventor 李飞唐宁
Owner 苏州炻原新材料科技有限公司
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