热老化对热障涂层界面力学性能影响及数值计算

doi:10.7527/S1000-6893.2023.28507

Abstract

Abstract:

To investigate the effect of Thermally Grown Oxide （TGO） on the life of thermal barrier coating system， Yttria Stabilized Zirconia （YSZ） was prepared by Atmospheric Plasma Spray （APS） method. Thermal barrier coating was subjected to thermal aging tests at 1 100 ℃ for different durations. Micro morphology of the coatings was observed and analyzed by Scanning Electron Microscopy （SEM）， then the interfacial fracture toughness and internal stress of the coating were measured by the interfacial indentation method and the Almen specimen bending method， respectively. The effects of TGO on the coating properties were systematically studied. Meanwhile， the dynamic Thermo-Mechanical Coupling Extended Layer-by-Layer/Solid Element （TM-XLW/SE） method was used to numerically study the problem. The extended layer-by-layer method was used to simulate the behavior between the Top Coat （TC）/TGO and the Bond Coat （BC）/TGO. The alloy matrix was constructed by eight-node solid element. According to the displacement， temperature coordination and internal force balance conditions of the connection area between the thermal barrier coating and the substrate， the thermal barrier coating and the substrate were coupled with each other. The influence of the evolution of TGO thickness on the mechanical properties of the thermal barrier coating under thermal aging was analyzed. The numerical results were compared with the experimental conclusions， which provides further support and evidence for the failure analysis of thermal barrier coatings.

Key words: thermal barrier coatings, thermally grown oxide, interfacial fracture toughness, dynamic thermal coupling, extended layer wise/solid element

CLC Number:

V257

Yankuan LIU, Hang YUAN, Dinghe LI, Yujie FEI. Effect of thermal aging on mechanical properties of thermal barrier coatings interface and numerical calculation[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(20): 428507-428507.

Figures/Tables 23

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工艺参数	BC层	TC层	气体
运载气体/PSI	40	40	Ar
主要气体/PSI	60	60	Ar
次要气体/PSI	100	100	He
喷涂电压/V	37	42
喷涂电流/A	750	850
喷涂距离/mm	85	85
送粉量/（r·min^-1）	2.5	4.0
喷涂速率/（mm·s^-1）	450	450

等温氧化时间/h	P_c/N	a_c/μm	K_ca/（MPa·m^1/2）
0	0.98	9.74	2.38±0.15
10	0.59	7.54	2.09±0.08
20	0.57	7.41	2.05±0.15
30	0.44	6.51	1.84±0.10
50	0.24	4.81	1.65±0.05

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Effect of thermal aging on mechanical properties of thermal barrier coatings interface and numerical calculation

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