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Coating material with abrasion-resistant and cavitation-damage-prevention functions and preparation method thereof

A coating material and anti-wear technology, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problem that anti-wear and anti-cavitation cannot be unified.

Inactive Publication Date: 2014-08-06
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current technical level makes it impossible to unify the anti-wear and anti-cavitation erosion in the surface coating of hydro turbines, which is a major technical problem in the field of hydropower

Method used

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  • Coating material with abrasion-resistant and cavitation-damage-prevention functions and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: the free state nanometer WC hard phase particle (about 50 nanometers) that accounts for total weight 5wt%, 10wt%, 20wt% respectively is mixed with the NiTi powder body material with CsCl type body centered cubic B2 structure, in low temperature ball milling Ball milling is carried out under the process, and after ball milling for 25 hours, the particle size of the powder is controlled at 10-100 microns by particle size screening to obtain WC particle-reinforced NiTi composite coating powder materials that can be used for supersonic flame spraying and plasma spraying. The cavitation erosion performance and wear performance of the coating after supersonic flame spraying are shown in Table 1. After adding nano-WC particles, the cavitation volume loss of NiTi alloy did not increase significantly, but at 15° and 90°, using 100M After the brown corundum is subjected to erosion wear, its erosion damage volume is significantly reduced, which is close to the erosion...

Embodiment 2

[0015] Embodiment 2: with NiTi metal wire material, wire material is melted and atomized and sprayed in distilled water by arc spraying process, obtains the powder particle of NiTi phase, then it is carried out with the nanometer WC hard phase particle that accounts for total weight 5wt% Mixing, through low-temperature ball milling technology, mechanical alloying for 25 hours, through particle size sieving, the powder particle size is controlled at 10-100 microns, and WC particle-reinforced NiTi composite coating powder materials that can be used for supersonic flame spraying and plasma spraying are obtained .

Embodiment 3

[0016] Example 3: Mix the submicron WC hard phase particles accounting for 5wt% of the total weight with the NiTi powder material having a CsCl-type body-centered cubic B2 structure, and perform ball milling under a low-temperature ball milling process. After ball milling for 25 hours, pass through a particle size sieve The particle size of the powder is controlled at 10-100 microns, and the WC particle-reinforced NiTi composite coating powder material that can be used for supersonic flame spraying and plasma spraying is obtained.

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Abstract

The invention discloses a coating material with abrasion-resistant and cavitation-damage-prevention functions and a preparation method thereof. The coating material is a composite coating powder material of a NiTi matrix phase enhanced by WC hard-phase particles, the WC hard-phase particles account for, by weight, 1-50% of the composite coating powder material, the NiTi matrix phase is an NiTi intermetallic compound of a B2 phase structure, the grain size of the WC hard-phase particles is at the nanometer lever less than100 nanometers or at the submicron level less than 1 micrometer and the WC hard-phase particles are evenly distributed in the NiTi intermetallic compound matrix phase in a dispersing mode. In the preparation method, the mechanical ball milling technology is used for realizing alloying or an atomization granulating technology is used for preparing the coating material, and the grain size of prepared powder is 5-100 micrometers; the powder maintains the cavitation-damage-prevention performance of NiTi alloy and meanwhile has the excellent abrasion-resistant performance of WC. Coatings coated with the powder do not need thermal treatment.

Description

technical field [0001] The invention relates to the technical field of abrasion and cavitation erosion of water turbine flow components, in particular to a coating material for the surface of water turbine flow flow components with both anti-wear and cavitation damage resistance and a preparation method thereof. Background technique [0002] The flow-passing parts of the turbine, such as the turbine runner, guide vane, top cover, bottom ring, etc., are often eroded by sand and cause metal loss on the surface of the flow-passing parts, causing vibration and noise during operation of the equipment, resulting in Low equipment operation efficiency, frequent overhaul, and shortened service life seriously affect the stability and safety of unit operation, cause huge economic losses, and even threaten the safe operation of the entire power grid. The erosion of the turbine is the result of the joint action of erosion, wear and cavitation. The three exist at the same time and promote...

Claims

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Application Information

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IPC IPC(8): B22F1/00C22C29/08C22C32/00C22C30/00C23C4/06C23C24/04
Inventor 李勇李太江李巍李聚涛刘刚
Owner HUANENG POWER INTERNATIONAL
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