Wear-resistance layers on surfaces of inner ring and outer ring of bypass variable mechanism of gas turbine and preparation method thereof

Abstract

The invention discloses wear-resistance layers on the surfaces of an inner ring and an outer ring of a bypass variable mechanism of a gas turbine and a preparation method thereof. The wear-resistance layers are positioned on the inner bottom surface of the outer ring and the outer top surface and the lateral surfaces of the inner ring; and the wear-resistance layers are molybdenum coatings and are made by an air plasma spraying method. The molybdenum coatings have high hardness, low friction coefficient and uniformly distributed ports and can store oil, improve the corrosion resistance and wear resistance of the inner ring and the outer ring of the bypass mechanism, prolong the service life of workpieces and reduce cost. The preparation method of the invention adopts the air plasma spraying process, solves the problems of difficult molybdenum melting, easy coating oxidization and low spraying efficiency and successfully applies aluminum densified coatings to the bypass mechanism of the gas turbine. At the same time, the spraying method has the advantages that: the temperature of the workpieces is below 150 DEG C in a spraying process; no post-treatment is required after spraying; and the workpieces do not deform.

Description

technical field [0001] The invention relates to the field of gas turbine processing, in particular to a wear-resistant layer on the surface of an inner ring and an outer ring of a gas turbine bypass variable mechanism and a preparation method thereof. Background technique [0002] For the mating surfaces of the inner and outer rings of the gas turbine bypass mechanism, see figure 1 , figure 2 , Corrosion and wear are very serious during long-term use, and frequent replacement and repairs are required, which makes the production line suspended and delays the construction period. In order to improve the wear resistance of the inner and outer ring mating surfaces of the gas turbine bypass mechanism, a method of spray-welding a layer of wear-resistant material on the surface of the workpiece can be used. However, spray welding a layer of wear-resistant material on the surface of the bypass mechanism will easily lead to deformation of the workpiece, which will cause unnecessar...

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Problems solved by technology

However, spray welding a layer of wear-resistant material on the surface of the bypass mechanism will easily lead to deformation of the workpiece, which will cause unnecessary losses; moreover, the workpiece needs to be tempered after spray welding, which makes the process complicated and increases the difficulty of operation. Increase costs, prolong processing time, and reduce production efficiency

Or replace the entire bypass mechanism with corrosion-resistant and wear-resistant materials, which will undoubtedly lead to a sharp increase in cost; moreover, to process corrosion-resistant and wear-resistant materials into bypass mechanisms, a set of special technical solutions and procedures must be formulated. Process flow increases operational difficulty, increases costs, prolongs processing time, and reduces production efficiency

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