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Thermal barrier coating system

A thermal barrier coating and coating technology, which is applied in the fields of power, material preparation, aerospace, aviation, and energy, can solve problems such as damage and failure of the interface between the ceramic layer and the bonding layer, increase the ability to ease thermal mismatch, improve Good interface bonding strength and thermal barrier effect

Inactive Publication Date: 2012-04-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

The rapid growth of TGO at high temperature causes damage and failure of the interface between the ceramic layer and the bonding layer

Method used

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Embodiment Construction

[0021] The present invention is described in further detail below in conjunction with accompanying drawing:

[0022] see figure 1 As shown, the patent invention discloses a thermal barrier coating system, which includes an adhesive layer 2 and a ceramic coating layer prepared sequentially on a substrate 1 . The ceramic coating mainly includes a toughened and heat-insulating layer 6 , a strengthening layer 4 , and a transition layer 5 between the two layers; The material of the ceramic coating is YSZ. By depositing YSZ powder particles on the bonding layer in a completely melted manner, a strengthening layer 4 with a dense columnar crystal structure and high fracture toughness is obtained, and the bonding rate is ≥ 96%; the deposition thickness of the strengthening layer 4 is 30-110 μm, which is vertical The columnar crystal structure on the surface, the grain size is at the nanoscale, and the coating is dense, so as to increase the diffusion resistance of oxygen atoms and en...

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Abstract

The invention discloses a thermal barrier coating system, which comprises a base body, a bonding layer and a multilayer ceramic coating, wherein the multilayer ceramic coating is formed on the bonding layer and comprises a reinforcing layer, a transition layer and a toughness enhancing thermal insulation layer which are sequentially formed on the bonding layer, and vertical cracks are arranged on the toughness enhancing thermal insulation layer. In the thermal barrier coating system, the ceramic coating is provided with the toughness enhancing thermal insulation layer with the sufficient vertical cracks, the ceramic coating has the characteristic of high stress toughness through the existence of the vertical cracks, the thermal mismatch relieving capability of the ceramic layer is enhanced, and the thermal stress in the ceramic layer is reduced, so the characteristics of efficient thermal barrier and long service life are obtained. The reinforcing layer is prepared near an interface easy to generate unsticking, the oxygen atom diffusion resistance can be enhanced, in addition, the layer separation invalidation position is transferred from the interface to a position inside the ceramic layer far away from a thermal growth oxide layer (TGO), simultaneously, the transition layer is formed between the toughness enhancing thermal insulation layer and the reinforcing layer, the thermal mismatch stress can be effectively reduced, and the thermal barrier coating system has the characteristic that the service life is long.

Description

【Technical field】 [0001] The invention relates to technical fields such as energy, power, aviation, aerospace, and material preparation, and in particular to a thermal barrier coating system and a preparation method thereof. 【Background technique】 [0002] Thermal barrier coatings (TBC) are widely used in energy, power, aviation, aerospace, machinery and other fields, such as thermal protection, corrosion resistance, and erosion resistance of high-temperature components of spacecraft and aircraft. The service temperature of hot-end components of modern spacecraft, aeroengine blades, gas turbines and other high-temperature components is as high as 1500 °C, far exceeding the service limit of superalloys. Therefore, thermal protection methods such as thermal barrier coatings must be used to protect the alloy matrix from high temperatures . Thermal barrier coatings usually refer to ceramic coatings that are deposited on the surface of high-temperature alloys and have good heat ...

Claims

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Application Information

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IPC IPC(8): B32B18/00B32B7/10
Inventor 王铁军范学领张伟旭
Owner XI AN JIAOTONG UNIV
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