Coating service life prediction method based on stress and bonding strength evolvement mechanism

A technology that combines strength and coating life, applied in measuring devices, special data processing applications, instruments, etc., can solve problems such as no coating life prediction method, and achieve comprehensive results

Active Publication Date: 2016-01-06
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0006] The present invention solves the problem that there is no co

Method used

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  • Coating service life prediction method based on stress and bonding strength evolvement mechanism
  • Coating service life prediction method based on stress and bonding strength evolvement mechanism
  • Coating service life prediction method based on stress and bonding strength evolvement mechanism

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specific Embodiment approach 1

[0029] A coating life prediction method based on stress and bonding strength evolution mechanism, including the following steps:

[0030] Step 1. Establish the residual stress-time variation relationship and the oxide layer stress-time variation relationship; according to the time variation relationship, the residual stress-time variation relationship and the oxide layer stress-time variation relationship are superimposed according to time to obtain the coating internal stress- Time-varying relationship, that is, the physical model of coating stress evolution;

[0031] Step 2. Thermal cycle accelerated sample aging:

[0032] Prepare a large number of coated samples, put the coated samples into the sample aging equipment and carry out high and low temperature cycle thermal aging treatment with different time lengths, so as to accelerate the aging speed of the samples, and obtain artificially accelerated aging samples i=( 1,2,3,...,N);

[0033] Step 3, XRD diffraction and data...

specific Embodiment approach 2

[0041] The specific operation steps for obtaining the physical model of coating stress evolution in step 1 of this embodiment are as follows:

[0042] Step 1. Collect the temperature-time function relationship of the coating service or storage environment, and use the lowest temperature as the reference temperature to obtain the reference temperature-time function relationship;

[0043] Step 2. Establish the residual stress-time change relationship: take 24 hours as a temperature change cycle, simplify the coating system according to the elastic-ideal plastic film model on the thick substrate, and calculate the thermal stress according to the formula Establish the residual stress-temperature cycle change model, and combine the reference temperature-time function relationship to obtain the residual stress-time change relationship;

[0044] Step 3, establishing the stress-time variation relationship of the oxide layer: according to the deformation coordination equation (deforma...

specific Embodiment approach 3

[0048] The specific operation steps for obtaining the reference temperature-time function relationship in step 1 of the present embodiment are as follows:

[0049] First put the coating in service or storage environment, record the lowest temperature T in this environment min , and collect the temperature-time function relationship of the coating; the current temperature T is expressed as the reference temperature with the lowest temperature as the reference , the reference temperature Note that the reference temperature corresponding to the highest temperature is

[0050] For a temperature change cycle, the reference temperature first rises from 0 to then drop to 0, then rise to By plotting the reference temperature history against time, the reference temperature-time function relationship described in step 1 can be obtained. It should be noted that since the deformation rate is not sensitive to temperature, the specific "waveform" of the reference temperature-time ...

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Abstract

The invention provides a coating service life prediction method based on a stress and bonding strength evolvement mechanism and relates to a coating service life prediction method. The coating service life prediction method aims at solving the problem a comprehensive and objective coating service life prediction method is not disclosed at present. The coating service life prediction method comprises the steps that firstly, residual stress-time change relation and oxidation layer stress-time change relation are established, and a coating stress evolutionary physical model is established; secondly, a thermal-cycle sample aging acceleration test is performed, and the acceleration times of artificially accelerating sample aging are obtained according to the coating stress evolutionary physical model and sample stress value-time relation; thirdly, a scratch test instrument is adopted to test the bonding strength of the sample artificially accelerated in aging, the bonding strength-ageing time relation is fit and is drawn into a changing curve, the time corresponding to the intersection point of the changing curve and a timeline serves as the service life 1 of the sample artificially accelerated in aging, and L is equal to sample service life 1* final acceleration times k and serves as the predicted service life. The coating service life prediction method is applicable to the field of coating service life prediction.

Description

technical field [0001] The invention relates to a method for predicting coating life. Background technique [0002] Coatings such as thermal barrier coatings and wave-absorbing coatings are widely used in missiles and spacecraft. During the long-term storage of these coatings, there will be different degrees of failure or potential failure such as functional degradation and performance degradation, which will cause serious damage to the structure and function of missiles and spacecraft. Therefore, it is very important to study the failure of the coating. [0003] The stress in the coating is a ubiquitous phenomenon in its production, preparation and service. The stress of the coating has its own characteristics, involving the thermal residual stress caused by the mismatch of thermal expansion coefficient between the film and the substrate during preparation, the oxidation stress and defect stress caused by high temperature oxidation during use, and so on. [0004] The coa...

Claims

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Application Information

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IPC IPC(8): G01N17/00G06F19/00
Inventor 朱嘉琦高鸽代兵王杨舒国阳陈亚楠刘康赵继文
Owner HARBIN INST OF TECH
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