Tangential functionally gradient coating transition region design and performance prediction method based on track width and track distance constraints

Abstract

The invention belongs to the field of thermal spraying, and relates to a tangential functionally gradient coating transition area design and performance prediction method based on channel width and channel distance constraints, a reasonable transition area structure is designed, and the method comprises the following steps: 1, determining a coating growth rate distribution function and channel width; 2, determining a transition region multi-track-pitch lap joint structure based on track width and track pitch constraints, specifically including determining track pitch, transition region width and lap joint layer number; and 3, calculating the equivalent recombination ratio of the coating at each position of the transition region by using an area weighting method, and predicting the erosionresistance of the coating at each position of the transition region. According to the tangential functionally graded coating transition area prepared by the method, all the transition areas of the coating follow the consistent transition rule, and the erosion resistance of the transition areas is stable and predictable in transition.

Description

technical field [0001] The invention relates to the technical field of thermal spraying, in particular to a design and performance prediction method for a transition zone of a tangentially functionally gradient coating based on the constraints of track width and track spacing. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] When blade parts are in service, they are impacted by gas-solid two-phase flow, and the erosion and wear of dust and particles can easily cause thinning damage. Metal-ceramic coatings have excellent wear resistance at low impact angles, but blade parts have complex shapes and a large range of impact angles, and the erosion resistance of metal-ceramic c...

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Problems solved by technology

[0004] The inventors have found that, unlike normal functionally gradient coatings and homogeneous coatings, along the tangential direction, the composite ratio of the coatings in each area of ​​the tangential functionally gradient coating gradually changes, and the design of the transition zone between each area involves spraying roads. Width, track spacing and coating lapping strategy, the unreasonable design of the transition zone may lead to unstable transition of erosion resistance performance in the transition zone, and there is a risk of stress concentration or unstable transition of erosion resistance performance. In addition, the tangential functional gradient coating There are technical gaps in the design and performance prediction of the layer transition zone

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