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Preparation process for high-temperature coating for hot-end component flame tube

A technology for hot-end components and preparation processes, applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of low bonding strength, poor thermal shock resistance of coatings, damage to hot-end components, etc. The effect of excellent thermal shock resistance, excellent corrosion resistance and simple process

Active Publication Date: 2017-03-15
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the use of the flame tube of the hot end part of the gas turbine, due to the high temperature, impact and corrosion of the flame flow ejected from the fuel nozzle, it is easy to cause damage to the hot end part, so a layer is often formed on the surface of the flame tube nozzle of the hot end part and around it. High-temperature coatings, but the coatings prepared by the existing spraying process often have problems of poor thermal shock resistance and low bonding strength, which have a great impact on the service life of the flame tube and industrial production; and there is no Appropriate protection methods can easily lead to excess material entering the cavity of the parts during the coating preparation process and cannot be completely cleaned; in addition, such parts are generally thin-walled parts, which are easily deformed during the automatic spraying process

Method used

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  • Preparation process for high-temperature coating for hot-end component flame tube
  • Preparation process for high-temperature coating for hot-end component flame tube
  • Preparation process for high-temperature coating for hot-end component flame tube

Examples

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Embodiment 1

[0018] A preparation process for a high-temperature coating for a hot-end component flame cylinder, the structure of the hot-end component flame cylinder is as follows figure 1 As shown, the preparation process includes: degreasing the part to be sprayed of the flame tube of the hot end part with acetone; figure 2 The protective clamp shown protects the non-sprayed part of the flame tube of the hot end part after degreasing, figure 1 The non-spraying part is marked as the round hole part, and the protective fixture includes a bolt 1 with the same diameter as the round hole part and a nut 2 matched with the bolt. Its structure is as follows: figure 2 As shown, the bolt 1 is inserted into the metal gasket 3 and rubber gasket 4 for sealing in sequence, and then inserted into the round hole of the flame tube, and then a layer of metal gasket 3 is inserted, and the non-spraying is completed after tightening the nut For the protection of the parts, perform sand blowing operation ...

Embodiment 2

[0024] A preparation process for a high-temperature coating for a hot-end component flame cylinder, the structure of the hot-end component flame cylinder is as follows figure 1 As shown, the preparation process includes: degreasing the part to be sprayed of the flame tube of the hot end part with acetone; using the same protective fixture as in Example 1 to protect the non-sprayed part of the flame tube of the hot end part after degreasing, and carry out the spraying process on the part to be sprayed. Sand blowing operation, control the roughness at 2.5~6.0 μm; use the same support fixture as in Example 1 to clamp the flame cylinder of the hot end part after sand blowing, and conduct plasma spraying of nickel-cobalt-chromium-aluminum-yttrium alloy powder on the sprayed parts in sequence The bottom layer (the model of alloy powder is KF-113) and the top layer of plasma sprayed 20% yttria stabilized zirconia composite powder (the model of zirconia composite powder is METCO 202NS)...

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Abstract

The invention provides a preparation process for a high-temperature coating for a hot-end component flame tube. The preparation process comprises the steps that the portions to be coated of the hot-end component flame tube are deoiled through an organic solvent; the non-coating portions of the deoiled hot-end component flame tube are protected through a protection clamp or high-temperature pressure-sensitive adhesive tape, sand blowing is conducted on the portions to be coated, and the roughness is controlled to be in the range of 2.5 micrometers-6.0 micrometers; the hot-end component flame tube obtained after sand blowing is conducted is clamped by supporting clamps, and plasma spraying of a nickel, cobalt, chromium, aluminum, yttrium alloy powder bottom layer and plasma spraying of a 20%-yttrium-oxide-stabilized zirconium oxide composite powder face layer are sequentially conducted on the portions to be coated; and by the adoption of the preparation process, the functional coating formed on the surface of the hot-end component flame tube has the excellent thermal shock resistance and heat insulation performance, wherein the matrix use temperature can be increased to 30 DEG C to 50 DEG C, and the bonding of the coating and a part matrix is good, the corrosion resistance is good, the technological process is simple, and the preparation process has the prospect of being popularized to protection of other adapting parts.

Description

technical field [0001] The invention relates to the surface protection technology of a hot-end component flame cylinder, in particular to a preparation process for a high-temperature coating for a hot-end component flame cylinder. Background technique [0002] During the use of the flame tube of the hot end part of the gas turbine, due to the high temperature, impact and corrosion of the flame flow ejected from the fuel nozzle, it is easy to cause damage to the hot end part, so a layer is often formed on the surface of the flame tube nozzle of the hot end part and around it. High-temperature coatings, but the coatings prepared by the existing spraying process often have problems of poor thermal shock resistance and low bonding strength, which have a great impact on the service life of the flame tube and industrial production; and there is no Appropriate protection methods can easily lead to excess material entering the cavity of the parts during the coating preparation proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/11C23C4/01C23C4/02
CPCC23C4/02
Inventor 常秋梅苏丹范铁兵刘礼祥滕志强
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION