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Slotted ceramic coatings for improved cmas resistance and methods of forming the same

A ceramic coating and coating technology, applied in the direction of coating, combustion method, metal material coating process, etc., can solve the problems of increased operating costs, coating peeling, and increased maintenance costs.

Pending Publication Date: 2021-07-02
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the stress generated in the TBC can lead to early spalling of the coating as the CMAS penetrates
Flaking of the TBC creates hot spots on the metal substrate, resulting in reduced component life
Spalling in turn leads to unscheduled maintenance as well as parts replacement, resulting in increased operating costs and increased repair costs

Method used

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  • Slotted ceramic coatings for improved cmas resistance and methods of forming the same
  • Slotted ceramic coatings for improved cmas resistance and methods of forming the same
  • Slotted ceramic coatings for improved cmas resistance and methods of forming the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0143] Example 1: Slotted vs. Unslotted APS-TBC & DVM-TBC (B151106):

[0144] The examples described below clearly demonstrate the benefits of grooving and the resulting segmented microstructure regardless of the thickness and chemistry of the TBC. The first slot is cut using a high speed diamond saw. For both types of TBCs (single-layer system and two-layer system), the slot pitch was kept constant at 100 microns (ie, about 40 mils). The slot depth is adjusted according to the total TBC thickness. The slots in the APS-TBC were 300 microns (about 12 mils) deep and the slots in the DVM-TBC were 500 microns deep. The nominal slot width was held constant at 25 microns. Figure 14A and Figure 14B Micrographs showing grooved 8YSZ TBC and DVM TBC are shown in , respectively. Both grooved and ungrooved samples were JETS tested. The results showed that the grooved samples with the preferred architecture survived significantly better than the control samples without any grooves....

example 2

[0145] Example 2: Effect of Slot Spacing on Furnace Cycling Test at 2075°F:

[0146] To determine the preferred slot spacing for improved compliance and CMAS resistance, samples with slot spacing ranging from 40 mils (1016 microns wide) to 120 mils (3048 microns wide) were studied. The sample was an air plasma sprayed 8YSZ TBC with a thickness of 380 microns. Slots are cut using a high-speed diamond saw. The slit depth is 250 microns and the width is nominally 25 microns. The slots produced 1000 micron square segments with a pitch of 25 microns. TBC sections of 2000 micron size and 3000 micron size were produced and tested as described below. The slotted samples were thermally cycled in an FCT furnace. Figure 15 Data are shown for two specimens of each geometry tested. The FCT procedure was described above. The samples with the 1000 micron slot pitch had more than twice the lifetime than the samples with the 2000 micron slot pitch or the 3000 micron slot pitch. The tes...

example 3

[0147] Example 3: Comparison between a slot produced using a picosecond laser and a slot produced using nanosecond laser grooving:

[0148] The results of this example demonstrate that the improved CMAS resistance provided by the slots and resulting TBC segments is independent of the slotting method. Two different laser systems were used to groove the TBC. One set of samples was grooved using a picosecond laser and a second set of samples was grooved using a nanosecond laser system. Samples produced included DVM 55YSZ with a slot pitch of 1000 microns and a depth of 500 microns. The slot width was about 75 microns on the top surface of the TBC and about 10 microns at the bottom of the slot. exist Figure 16 A micrograph of a slotted TBC is shown in . Using the method described above, two sets of grooved TBCs were tested along with the ungrooved TBC baseline samples. The two sets of slotted samples showed significantly better performance than the baseline sample without sl...

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Abstract

A coated component for a gas turbine engine is provided. The coated component includes a substrate having a surface and a ceramic coating. The ceramic coating includes one or more linear slots and one or more non-linear slots. The one or more non-linear slots intersect the one or more linear slots. The plurality of linear slots and the plurality of non-linear slots form segments of ceramic coating material.

Description

technical field [0001] Embodiments of the invention generally relate to ceramic coatings (eg, thermal and environmental barrier coatings) for components of turbomachines, such as gas turbine engines. Background technique [0002] The latest high performance gas turbine engines generally require thermal barrier coatings (TBC). The efficiency of a gas turbine engine increases as the combustion temperature of the combustion gases increases. As combustion temperatures increase, there is a need to increase the high temperature durability of turbine components. Nickel- and cobalt-based superalloy materials are now widely used for components in the hot gas flow path, such as combustor liners and combustor transition pieces, and turbine rotating and stationary blades (directionally solidified and single crystal). However, even these latest superalloys cannot withstand long-term operation at temperatures that can sometimes exceed 1400°C. In many applications, a metal substrate is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02C7/24F02C7/22F23R3/00C23C4/10C23C4/134C23C4/129C23C14/08C23C14/22
CPCF02C7/24F02C7/22F23R3/00C23C4/10C23C4/134C23C4/129C23C14/08C23C14/22F05D2230/90F01D5/288Y02T50/60
Inventor H·克沙文C·A·约翰逊陈鸿强B·P·布莱B·A·小普里查德M·M·德德
Owner GENERAL ELECTRIC CO