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Thermal barrier coating spraying quality evaluation and control method

A thermal barrier coating, quality technology, applied in the direction of coating, electrical program control, metal material coating process, etc., can solve the problem of inability to comprehensively and directly evaluate coating quality characteristics and process consistency, parameter hardware structure or coordination Relationship changes, no online real-time negative feedback closed-loop control, etc., to avoid the installation and debugging process of online equipment and instruments, the process layout has no effect, and the cost is low

Active Publication Date: 2020-11-27
BEIJING GOLDEN WHEEL SPECIAL MACHINE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 has been commercialized, but there are the following technical problems: ① There is no real closed-loop control of online real-time negative feedback, that is, a fully coupled control mechanism based on microstructure characteristics, performance and parameters; ② Each technology can only feedback local problems, and cannot be comprehensive and direct The evaluation of coating quality characteristics and the consistency of the processing process; ③The hardware cost is high, and the requirements for the operator's technical level are relatively high
Two-dimensional morphology features are associated with hardware, parameter-related plasma and powder interactions, such as powder distribution in plasma, melting effect, melting effect, and sheet thickness, etc., which are related to various coating microstructures and properties characteristics, by reasonably evaluating the process and coating quality based on the two-dimensional morphology characteristics, establishing mutual management characteristics, and exploring the method of coating quality control under the production control curing process conditions using the physical characteristics of the two-dimensional morphology, there is no relevant report yet

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0067] Embodiment 1: Use acetone to clean the matrix alloy, use the XP-5 suction sandblasting machine to carry out sandblasting treatment on the matrix, the abrasive is 24 mesh white corundum sand, the sandblasting pressure is 0.4MPa, and the sandblasting distance is 50-100mm, The sandblasting angle is 50-90°, and the DZ-HL5000 supersonic spraying system is used to prepare the bonding layer with a thickness of 10-30 μm. The material of the bonding layer is NiCoCrAlY powder, and the process parameters are oxygen flow rate of 20-60m 3 / h, the kerosene flow rate is 10-50L / h, the powder feeding rate is 40-80g / min, and the spraying distance is 300-400mm. After the bonding layer is prepared, use the DH-80 plasma spraying system to prepare the ceramic layer. It is 7YSZ, the process parameters are current 60-80A, voltage 550-650V, powder feeding rate 20-60g / min, spraying distance 50-100mm, spraying trajectory such as figure 2 As shown, reciprocating spraying is carried out 40 times a...

Embodiment 2

[0071] Embodiment 2: Use acetone to clean the matrix alloy, use the XP-5 suction sandblasting machine to carry out sandblasting treatment on the matrix, the abrasive is 24 mesh white corundum sand, the sandblasting pressure is 0.4MPa, and the sandblasting distance is 50-100mm, The sandblasting angle is 50-90°, use the DZ-HL5000 supersonic spraying system to prepare the bonding layer, the thickness is 10-30μm, the bonding layer material is NiCoCrAlY powder, use the DH-80 plasma spraying system to prepare the ceramic layer, the ceramic layer powder For 7YSZ, the HVOF and plasma spraying process parameters are the same as those in Implementation 1. Spray trajectory such as figure 2 As shown, reciprocating spraying is carried out 40 times along the X direction, and the moving distance of the spray gun is X 0 ±30mm, the center of the spray gun must coincide with the center line during the process, and the temperature of the spraying process should be lower than 400°C.

[0072] U...

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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...

Claims

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Application Information

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IPC IPC(8): G01B11/24G05B19/04C23C4/134
CPCG01B11/24G05B19/04C23C4/134
Inventor 何箐郭腾王世兴由晓明葛超王秋童
Owner BEIJING GOLDEN WHEEL SPECIAL MACHINE
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