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A Reliability Assessment Method for Interface Oxidation Failure of Thermal Barrier Coatings Based on jc Algorithm

A thermal barrier coating, reliability technology, used in computing, special data processing applications, instruments, etc., can solve problems such as no research progress reports

Active Publication Date: 2016-12-28
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There are no reports of research progress in this area

Method used

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  • A Reliability Assessment Method for Interface Oxidation Failure of Thermal Barrier Coatings Based on jc Algorithm
  • A Reliability Assessment Method for Interface Oxidation Failure of Thermal Barrier Coatings Based on jc Algorithm
  • A Reliability Assessment Method for Interface Oxidation Failure of Thermal Barrier Coatings Based on jc Algorithm

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Experimental program
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specific Embodiment 1

[0071] Compression failure of thermal barrier coatings at room temperature combined with real-time detection by acoustic emission. The base material of 12 plasma sprayed thermal barrier coating samples is GH3030, length*width*height=20*5*5, the unit is mm; the intermediate transition layer material is NiCr 22 Al 7 Y 0.2 (wt.%), the thickness is about 100μm; the ceramic layer material is ZrO 2 -8wt.%Y 2 o 3 , with a thickness of about 200 μm. In the experiment, a universal compressor was used to load the sample. At the same time, two acoustic emission sensors were placed at both ends of the sample to receive the acoustic emission signal and record the critical stress value when the thermal barrier coating interface peeled off and failed.

[0072] (1) Analyze the main failure modes of thermal barrier coatings and establish failure criteria.

[0073] The failure mode is thermal barrier coating interface peeling failure under compressive load, such as Figure 7 shown, where...

specific Embodiment 2

[0087] Under thermal cycling conditions, atmospheric plasma sprayed TBCs, such as Image 6 As shown, the crack located between the two peaks in the tensile region, when the minimum energy release rate of the TBC reaches its fracture toughness, the crack propagates to its delamination failure.

[0088] (1) Analyze the main failure modes of thermal barrier coatings and establish failure criteria.

[0089] Failure mode: Under thermal cycle conditions, the cracks in the TBC of the thermal barrier coating sprayed by atmospheric plasma sprayed to its delamination failure.

[0090] The established failure criterion is: Γ TBC ≤E TBC L(ΔαΔT) 2 κ(N-N 0 )

[0091] That is, when the minimum energy release rate of TBC reaches its fracture toughness, the coating delamination fails.

[0092] Among them, the minimum energy release rate G min =E TBC L(ΔαΔT) 2 κ(N-N 0 ), E TBC is the Young's modulus of TBC, as Image 6 L shown is the half-wavelength of the sinusoidal curve describin...

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Abstract

The invention discloses a JC algorithm based method for evaluating the interface oxidation failure reliability of a thermal barrier coating and belongs to the technical field of reliability analysis of thermal barrier coating materials. The method comprises the steps of establishing a failure criterion of the thermal barrier coating to determine a limit state equation of the thermal barrier coating, and analyzing random statistical properties of all parameters in the state equation; setting initial checking points of all parameters, subjecting a performance function to first-order Taylor expansion at checking points, iteratively calculating the optimal checking point, and outputting a first-order failure probability of a failure mode; when the nonlinear degree of the performance function is high, subjecting the performance function to second-order Taylor expansion at checking points, and calculating a second-order failure probability; and fitting failure probabilities and quadratic functions of all parameters to calculate sensitive factors of all parameters. According to the method, a JC algorithm for engineering reliability analysis is used for reference, so that the reliability of the thermal barrier coating can be evaluated simply, quickly and quantitatively, influence degrees of all parameters on the failure of the thermal barrier coating can be analyzed according to sensitive factors, and the method is significant to the evaluation of the reliability of the thermal barrier coating.

Description

technical field [0001] The invention relates to a method for evaluating the reliability of thermal barrier coating interface oxidation failure reliability based on a JC algorithm, and belongs to the technical field of reliability analysis of thermal barrier coating materials. Background technique [0002] With the increase of the thrust-to-weight ratio, the gas inlet temperature of the aero-engine continues to increase. By the time of the fourth-generation fighter jets, the gas inlet temperature has reached 1700°C. The substantial increase in the inlet temperature undoubtedly puts forward higher requirements for the superalloy materials of the hot end parts of the engine. At present, the service limit temperature of advanced single crystal nickel-based superalloys is 1150°C. Obviously, the use of superalloy materials alone cannot meet the needs of advanced aero-engines. Based on this, NASA proposed the concept of thermal barrier coatings (thermal barrier coatings, TBCs) in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 杨丽郭进伟朱旺周益春蔡灿英
Owner XIANGTAN UNIV