Anti-cavitation composite coating and preparation method thereof

A composite coating and cavitation technology, which is applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of cumbersome preparation methods of anti-cavitation coatings, easy peeling failure, harsh requirements, etc., to avoid Local enrichment problem, solving oxidation decomposition or forming coating inclusions, good toughness and plasticity

Pending Publication Date: 2022-03-25
STATE POWER INVESTMENT CORP RES INST +1
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Problems solved by technology

[0006] In view of the cumbersome preparation method of the anti-cavitation coating in the above-mentioned prior art, and the technical problems of low strength, high brittleness, and easy peeling and failure in the existing anti-cavitation coating, the purpose of the present invention is to provide an anti-cavitation coating Composite coating, the present invention also proposes a method for preparing the above-mentioned anti-cavitation composite coating. The present invention optimizes the process by designing a two-phase mixed lattice structure high-entropy alloy and adopting technical methods such as uniformly dispersed second phase strengthening and surface strengthening. , to obtain a composite strengthened coating with high hardness, good rigidity and good toughness and plasticity, which solves the problem of tedious and demanding preparation methods of the current anti-cavitation coating, and overcomes the strength of the existing coating under cyclic fatigue alternating stress Disadvantages of low, high brittleness, and easy peeling failure

Method used

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  • Anti-cavitation composite coating and preparation method thereof
  • Anti-cavitation composite coating and preparation method thereof
  • Anti-cavitation composite coating and preparation method thereof

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preparation example Construction

[0046] The preparation method of anti-cavitation composite coating provided by the invention, such as figure 1 shown, including the following steps:

[0047] (1) Powder preparation stage;

[0048] (2) Powder pretreatment stage;

[0049] (3) Substrate spraying stage;

[0050] (4) Intensive treatment stage.

[0051] Powder preparation stage:

[0052] Select the metal powder source and the second phase strengthening source that meet the requirements, prepare according to a certain molar ratio, and weigh the high entropy alloy powder source and the second phase strengthening powder source according to a certain mass ratio.

[0053] Powder pretreatment stage:

[0054] The composite powder of the high-entropy alloy powder source and the second-phase strengthening powder source is crushed by airflow, sieved by vibration, and processed by a three-dimensional mixer to obtain a uniformly mixed composite powder. Specifically, the composite powder is broken up by a grading jet crush...

Embodiment 1

[0064] Embodiment 1: AlTiCoVNb / BN composite coating

[0065] The high-entropy alloy powder source and the BN second-phase strengthening powder source are prepared according to the weight percentage of 95%:5%. Wherein, the high-entropy alloy powder source is Al, Ti, Co, V, Nb alloy powder prepared in a molar ratio of 1:1:1:1:1. After the composite powder is crushed by a 50Hz / min frequency airflow, after passing through a 100-mesh vibrating sieve, put the under-screened material into a mixing tank, and use a three-dimensional mixer to mix for 8 hours. The speed of the three-dimensional mixer is 30r / min to obtain a uniform High entropy alloy composite powder.

[0066] Commonly used hydropower martensitic stainless steel (brand ZG0Cr16Ni5Mo) substrate surface is derusted and degreased, then subjected to 60-mesh emery blasting roughening pretreatment, and cleaned with alcohol ultrasonics, dried for later use. The substrate is subjected to multi-pass supersonic spraying treatment ...

Embodiment 2

[0068] Embodiment 2: AlNiTiMoVNb / SiC composite coating

[0069] The high entropy alloy powder source and the SiC second phase strengthening powder source meeting the requirements are prepared according to the weight percentage of 90%:10%. Wherein, the high-entropy alloy powder source is Al, Ni, Ti, Mo, V, Nb alloy powder prepared in a molar ratio of 0.8:1:1:1:1:0.5. After the composite powder is crushed by a 50Hz / min frequency airflow, after passing through a 120-mesh vibrating sieve, put the under-sieve material into the mixing tank, and use a three-dimensional mixer to mix for 6 hours. The speed of the three-dimensional mixer is 40r / min to obtain a uniform High entropy alloy composite powder.

[0070] The commonly used hydropower martensitic stainless steel (brand ZG0Cr13Ni4Mo) substrate surface is derusted and degreased, then subjected to 80-mesh alumina sandblasting roughening pretreatment, cleaned with alcohol ultrasonic cleaning, and dried for later use. The substrate ...

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Abstract

The invention discloses an anti-cavitation composite coating and a preparation method thereof. The anti-cavitation composite coating is prepared from composite powder composed of a high-entropy alloy powder source and 0.01 wt%-50 wt% of a second phase strengthening powder source through hypersonic flame spraying. The high-entropy alloy powder source is composed of elements Al, Ti, V, an element represented by m and an element represented by n. After the high-entropy alloy composite powder is designed and prepared, the cavitation-erosion-resistant composite coating containing the double-phase high-entropy alloy and the dispersed second-phase structure is prepared by adopting a hypersonic flame spraying and surface strengthening method, the thickness is 100-400 microns, and the bonding strength of the coating and a matrix can reach 75 MPa or above. The preparation method is low in cost, simple and easy to control and high in production efficiency; the prepared composite coating is uniform in structure, high in bonding strength, high in strength and rigidity, good in toughness and plasticity, high in compactness and the like, the use performance of the anti-cavitation coating can be effectively improved, the service life of the anti-cavitation coating can be effectively prolonged, and the actual requirements of hydraulic machinery are met.

Description

technical field [0001] The invention belongs to the technical field of surface strengthening, and in particular relates to an anti-cavitation composite coating and a preparation method thereof. Background technique [0002] After long-term operation, cavitation problems commonly exist in hydraulic turbines, ships and other flow-passing components, which will not only damage facilities and equipment, generate vibration and noise, but also reduce operating efficiency, seriously affecting the performance and service life of equipment. According to incomplete statistics, the economic loss caused by cavitation and cavitation erosion in my country has reached several billion yuan per year. The cavitation phenomenon can be simplified into two processes of cavitation and cavitation, which go through three stages of cavitation bubble formation, cavitation bubble growth and violent collapse. The high-speed micro-jet and high-pressure shock wave produced after the collapse of cavitati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/06C23C4/18
CPCC23C4/129C23C4/06C23C4/18
Inventor 张林海黄弘刘艳红周全民王晓婧郑明珉孙金华丁学强沈秋燕宁峻黄超安
Owner STATE POWER INVESTMENT CORP RES INST
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