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Blade tip cutting coating capable of improving bonding strength with blade tip and preparation method thereof

A combination strength and coating technology, applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problem of reducing the bonding strength between the coating and the blade tip, achieve good wear resistance, slow down viscous wear, Clear the effect of grinding

Active Publication Date: 2021-12-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a blade tip cutting coating that can improve the bonding strength with the blade tip and its preparation method, so as to solve the technical problem that the oxidation layer on the surface of the blade tip reduces the bonding strength between the coating and the blade tip

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A blade tip cutting coating for improved bond strength to the blade tip includes a bonding alloy layer and a hard particle cutting layer. The bonding alloy layer is made of Ni71CrSi powder with an average particle size of 20 μm and a melting point of 1408K. Cubic boron nitride particles are selected as hard particles, with an average particle size of 50 μm. The concrete preparation scheme of this coating is as follows:

[0026] Substrate pretreatment: select the blade substrate made of titanium alloy TC11, the melting point of titanium alloy TC11 is 1933K, firstly polish the tip surface of the blade with water sandpaper, then put it into an organic solvent for ultrasonic cleaning, dry it and put it in a drying dish.

[0027] Preparation of brazing flux film: the brazing flux is water-soluble brazing flux, the mass percentage of which is 65% boric acid, 30% sodium tetraborate and 5% metal fluoride. The melting point of the brazing flux is 986K. Dissolve 1.2 g of flux i...

Embodiment 2

[0032] A blade tip cutting coating for improved bond strength to the blade tip includes a bonding alloy layer and a hard particle cutting layer. The bonding alloy layer is made of Ni82CrSiBFe powder with an average particle size of 20 μm and a melting point of 1223K. Cubic boron nitride particles are selected as hard particles, with an average particle size of 80 μm. The concrete preparation scheme of this coating is as follows:

[0033] Substrate pretreatment: The blade substrate made of titanium alloy TC11 is selected, and the melting point of titanium alloy TC11 is 1933K. Firstly, the surface of the tip of the leaf is polished with water sandpaper, then placed in an organic solvent for ultrasonic cleaning, dried and placed in a drying dish.

[0034] Preparation of brazing flux film: the brazing flux is water-soluble brazing flux, the mass percentage of which is 70% boric acid, 26% sodium tetraborate and 4% metal fluoride. The melting point of the brazing flux is 979K. Di...

Embodiment 3

[0039]A blade tip cutting coating for improved bond strength to the blade tip includes a bonding alloy layer and a hard particle cutting layer. The bonding alloy layer is made of Ni71CrSi powder with an average particle size of 30 μm and a melting point of 1408K. Cubic boron nitride particles are selected as hard particles, with an average particle size of 120 μm. The concrete preparation scheme of this coating is as follows:

[0040] Substrate pretreatment: select the blade substrate made of titanium alloy TC11. The melting point of titanium alloy TC11 is 1933K. First, polish the blade tip surface substrate with water sandpaper, then put it into an organic solvent for ultrasonic cleaning, dry it and put it in a drying dish.

[0041] Preparation of brazing flux film: the brazing flux is water-soluble brazing flux, the mass percentage of which is 80% boric acid, 15% sodium tetraborate and 5% metal fluoride. Dissolve 1.1g of flux in 100g of water solvent and mix uniformly to m...

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Abstract

The invention discloses a blade tip cutting coating capable of improving bonding strength with the blade tip and a preparation method thereof, belonging to the technical field of material surface modification and coating. The preparation method of the blade tip cutting coating comprises the following steps: step 1, uniformly coating the flux solution on the blade tip surface with a clean surface, forming a continuous and dense flux film on the blade tip surface; step 2, A bonding alloy layer is prepared on the surface of the blade tip coated with flux; step 3, a single layer of hard ceramic particles is evenly dispersed on the surface of the bonding alloy layer, heated and melted to obtain a blade tip cutting coating. This application pre-presets a layer of flux on the tip surface of the blade. The flux can break the oxide film on the tip surface of the blade, eliminate the oxidized inclusions between the binder phase and the tip surface of the matrix, and improve the bonding strength of the tip coating. . The blade tip cutting coating prepared by the method of the present application has less oxide film inclusions at the interface between the bonding alloy layer and the blade tip, and the blade tip cutting coating and the blade tip surface are firm.

Description

technical field [0001] The invention relates to the technical field of material surface modification and coating, in particular to a blade tip cutting coating capable of improving bonding strength with the blade tip and a preparation method thereof. Background technique [0002] In order to improve the efficiency of aero-engines and reduce fuel consumption, the clearance between the compressor, turbine tip and casing should be reduced as much as possible. However, in the use of blades, thermal deformation and vibration will cause the overall displacement of the parts, the high-speed rotation of the engine rotor will cause the blades to elongate, and certain tolerances and assembly deviations must be reserved during the processing of parts. Leave some space. Therefore, the sealing coating system can be used to reduce the gap, that is, a layer of abradable sealing coating is applied to the stator parts such as the inner wall of the casing, and a wear-resistant sealing coating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C26/00C23C4/134C23C4/137C23C4/02C23C4/08
CPCC23C26/00C23C4/134C23C4/137C23C4/02C23C4/08
Inventor 杨冠军石秋生刘梅军陈林李长久
Owner XI AN JIAOTONG UNIV