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Laser remelting one-step reinforcing processing method and device thereof for plasma sprayed thermal barrier coating with double-layer structure

A double-layer structure, thermal barrier coating technology, applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problems of complicated process and easy cracks in the coating, and achieve simple process and remelting coating High layer quality and good stability

Inactive Publication Date: 2013-09-04
TONGLING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In summary, after searching the existing technical literature, it is found that the common strengthening methods for plasma spraying double-layer structure thermal barrier coatings include one-time laser remelting strengthening and step-by-step remelting strengthening, but the traditional one-time laser remelting only It can strengthen the surface ceramic layer, but the step-by-step strengthening process is not only complicated, but also the coating is prone to cracks, which has obvious shortcomings

Method used

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  • Laser remelting one-step reinforcing processing method and device thereof for plasma sprayed thermal barrier coating with double-layer structure
  • Laser remelting one-step reinforcing processing method and device thereof for plasma sprayed thermal barrier coating with double-layer structure

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Embodiment 1

[0023] like figure 1 As shown, the processing device of the present invention includes an induction heating coil 2, a laser head 3, and a high-frequency induction heater 4. The high-frequency induction heater 4 is connected to the induction heating coil 2, and the induction heating coil 2 is fixed on the laser head 3. Above, the laser emitted by the laser head 3 is located in the center of the heating area of ​​the induction heating coil 2, and the sample 5 is fixed on the workbench 7. This device also uses the numerical control console 1 to control the laser 6 and the high-frequency induction heater 4 respectively, and the laser 6 It is connected with the laser head 3.

[0024] One-step enhanced plasma spraying of MCrAlY / ZrO on the surface of nickel-based superalloy substrate using induction heating assisted laser remelting composite process 2 Double-layer structure thermal barrier coating, the specific steps are as follows:

[0025] (1) The surface of the GH4033 nickel-bas...

Embodiment 2

[0029] In this example, the induction heating-assisted laser remelting composite process is used to intensify the plasma spraying of MCrAlY / ZrO on the surface of the nickel-based superalloy substrate in one step. 2 -MgO double-layer structure thermal barrier coating, the specific steps are as follows:

[0030] (1) The surface of the GH4033 nickel-based superalloy substrate is pretreated by grinding, degreasing, sandblasting and cleaning;

[0031] (2) Spray MCrAlY metal bonding layer and ZrO on the surface of nickel-based superalloy substrate in sequence 2 -22%MgO (mass fraction) surface ceramic layer, spraying process parameters are shown in Table 1;

[0032] (3) Through laser remelting treatment, the ZrO in the double-layer structure thermal barrier coating 2 The -22%MgO surface ceramic layer and the MCrAlY metal bonding layer are melted at the same time, so that the ZrO 2 The interface between the -22%MgO surface ceramic layer and the MCrAlY metal bonding layer, and the i...

Embodiment 3

[0035] In this example, the induction heating-assisted laser remelting composite process is used to intensify the plasma spraying of MCrAlY / ZrO on the surface of the nickel-based superalloy substrate in one step. 2 -CaO double-layer structure thermal barrier coating, the specific steps are as follows:

[0036](1) The surface of the GH4033 nickel-based superalloy substrate is pretreated by grinding, degreasing, sandblasting and cleaning;

[0037] (2) Spray MCrAlY metal bonding layer and ZrO on the surface of nickel-based superalloy substrate in sequence 2 -15%CaO (mass fraction) surface ceramic layer, spraying process parameters are shown in Table 1;

[0038] (3) Through laser remelting treatment, the ZrO in the double-layer structure thermal barrier coating 2 The -22%MgO surface ceramic layer and the MCrAlY metal bonding layer are melted at the same time, so that the ZrO 2 -15%CaO surface ceramic layer and MCrAlY metal bonding layer interface, MCrAlY metal bonding layer and...

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Abstract

The invention discloses a laser remelting one-step reinforcing processing method and device thereof for a plasma sprayed thermal barrier coating with a double-layer structure. A plasma spraying process is adopted to spray the thermal barrier coating with the double-layer structure on a matrix surface after purification and activating treatment; and an induction heating auxiliary laser remelting compound process is adopted to remelt the thermal barrier coating with the double-layer structure. With the adoption of the induction heating auxiliary laser remelting compound process, the defect of insufficient energy of pure laser remelting can be overcome, so that one-step laser remelting can melt a ceramic layer and a bonding layer in the thermal barrier coating with the double-layer structure simultaneously, and one-step reinforcement of metallurgical bonding between the ceramic layer and the bonding layer interface and between the bonding layer and the matrix interface is achieved simultaneously; and the laser remelting one-step reinforcing processing device has the advantages of simple process, good stability, good remelted coating quality and the like, and accordingly is expected to be applied to key hot-end part surfaces of air-turbine motor blades and the like.

Description

technical field [0001] The invention relates to a method and device for laser remelting strengthening of a thermal barrier coating, in particular to a plasma sprayed double-layer structure thermal barrier coating laser remelting one-step strengthening processing method and a device thereof. Background technique [0002] In order to reduce the fuel consumption of future aerospace engines and improve the thrust / mass ratio and service life, many advanced materials with low density, good room temperature toughness and high temperature strength will be used in large quantities, and various functional coatings will be widely used, among which Thermal barrier coatings play a very important role in increasing the engine operating temperature. [0003] There are three main structures of thermal barrier coatings: double-layer structure, multi-layer structure and gradient structure. The surface layer of the double-layer structure is a surface ceramic layer, and the middle layer is a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C4/04C23C24/10
Inventor 王东生田宗军周杏花沈理达黄因慧
Owner TONGLING UNIV
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