Thermal barrier coating spraying quality evaluation and control method

Abstract

The invention discloses a thermal barrier coating spraying quality evaluation and control method. A laser contourgraph and a thermal barrier coating ceramic thermal insulation layer sprayed repeatedlyare adopted. Before a workpiece is sprayed, a coating quality confirmation test piece is prepared; a laser profilometer is used for scanning the two-dimensional morphology full view; the method comprises the steps of data exporting, three-section morphology characteristic curve extracting, Gaussian fitting analyzing, Gaussian peak characteristic parameter providing, high-quality coating standardparameter comparing and technological process stability and coating quality evaluating. The rapid and effective method for evaluating the quality of the coating is performed; for coatings with different process characteristics, parameters such as A, FWHM, A/FWHM and abscissa values Xc corresponding to Gaussian peaks can be further determined through a large number of standard process tests and coating performance verification, and quality control and process stability evaluation of the coating are further enhanced.

Description

technical field [0001] The invention relates to the field of thermal barrier coating spraying, in particular to a thermal barrier coating spraying quality evaluation and control method. Background technique [0002] Thermal barrier coating is one of the three key manufacturing technologies of modern gas turbine engine turbine blades. It is an indispensable key technical means to improve the durability, service temperature and service means of turbine blades. The quality stability and Service reliability seriously affects the service safety of turbine blades, and even affects the power safety of aero-engine flight or ship power, gas for power generation, and energy supply security. At present, the manufacturing technology of thermal barrier coatings for turbine blades and stator blades is still dominated by thermal spraying technology, among which atmospheric plasma spraying technology is the key core technology for preparing ceramic thermal insulation layers. Atmospheric pl...

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Problems solved by technology

Under the above multi-coupling and multi-parameter conditions, the coating preparation process range can be optimized through simple orthogonal experiments, but often requires a large amount of data to determine the best process range, but due to the characteristics of the plasma itself, including its plasma generator The attenuation loss of cathode and anode with the use, the deviation of parameters, the change of hardware structure or coordination relationship, etc., will lead to changes in plasma characteristics and coating quality

[0004] In this context, researchers and engineers at home and abroad use the establishment of coating process parameters and coating performance, microstructure correlation law, online particle temperature/velocity monitoring, online performance (thickness, residual stress and mechanical properties, etc.), to improve Equipment automatic control level and parameter negative feedback control (such as using computer-aided control technology to achieve stable net energy control), revealing the deposition process mechanism (sputter formation and coating formation) to guide process regulation and other means and measures; although some of the above technologies have been It...

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