Coating for improving abrasion resistance of ship gas turbine compressor drum and preparation method of coating

A compressor and wear-resistance technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of insufficient toughness, brittle layered peeling of coating, and decreased wear resistance, and achieve simple and practical sexual effect

Inactive Publication Date: 2017-05-31
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Traditional marine gas turbine compressor drums are plasma-sprayed oxide ceramic wear-resistant coatings, usually using alumina ceramic coatings as the working layer, which does not take into account that ceramic coatings have high hardness and brittleness in friction and wear, but insufficient toughness The coating is easy to be in the process of friction and wear, and the microcracks inside the coating are continuously formed at the coating defect (such as pores, microcracks, etc.) or at the interface of flat particles and continue to expand along the defect or interface. The micro-cracks are interlaced and form a network, which leads to the fracture of the coating and causes the brittle layer of the coating to peel off, resulting in a decrease in its wear resistance

Method used

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  • Coating for improving abrasion resistance of ship gas turbine compressor drum and preparation method of coating
  • Coating for improving abrasion resistance of ship gas turbine compressor drum and preparation method of coating
  • Coating for improving abrasion resistance of ship gas turbine compressor drum and preparation method of coating

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preparation example Construction

[0037] The preparation method of the coating used to improve the wear resistance of the marine gas turbine compressor drum of the present invention relates to a preparation of YSZ / Al based on plasma spraying technology 2 o 3 A method for doping a ceramic fiber composite coating, comprising the steps of:

[0038](1) Alloy substrate pretreatment: use sandpaper to smooth the surface of the substrate, then use absolute ethanol and acetone to clean the polished substrate in sequence; before plasma spraying, perform sandblasting;

[0039] (2) Preparation of the composite bonding layer spraying material: ball mill the ceramic fiber to a suitable particle size, ultrasonically disperse it, and dry it; mix the powder material of the working layer with the ceramic fiber according to a certain ratio and then ball mill it to obtain a composite powder ;

[0040] (3) Spraying powder pretreatment: dry the pre-spraying powder, holding temperature 200°C, holding time 2h;

[0041] (4) Spray a...

Embodiment 1

[0049] Step 1: Use sandpaper to smooth the surface of the 1Cr18Ni9Ti substrate, then use absolute ethanol and acetone to clean the polished substrate in sequence; before plasma spraying, perform sandblasting;

[0050] Step 2: Measure YSZ powder, Al 2 o 3 The powder and mullite fiber are mixed according to the mass fraction ratio (0.20:0.76:0.04) using a ball mill to prepare a composite powder. The mullite fiber ball milling conditions are as follows: the ball-to-material ratio is 2:1, the ball milling speed is 350r / min, and the ball milling time is 10min. Ultrasonic dispersion 1h, dry treatment. Preparation of YSZ / Al doped with 4% mullite fiber 2 o 3 Composite powder, the ratio of ball to material is 1:1, the ball milling speed is 200r / min, and the ball milling time is 2h;

[0051] Step 3: Put the NiCrAlY powder of the bonding layer and the composite powder prepared in Step 2 into a drying oven for drying at a drying temperature of 200°C and a drying time of 2 hours;

[...

Embodiment 2

[0064] Step 1: Use sandpaper to smooth the surface of the 1Cr18Ni9Ti substrate, then use absolute ethanol and acetone to clean the polished substrate in sequence; before plasma spraying, perform sandblasting;

[0065] Step 2: Measure YSZ powder, Al 2 o 3 The powder and SiC fibers were mixed in a mass fraction ratio (0.30:0.66:0.04) using a ball mill to prepare a composite powder. SiC fiber ball milling conditions are: the ball-to-material ratio is 2:1, the ball-milling speed is 350r / min, and the ball-milling time is 10min. Ultrasonic dispersion 1h, dry treatment. Preparation of YSZ / Al doped with 4% SiC fiber 2 o 3 Composite powder, the ratio of ball to material is 1:1, the ball milling speed is 200r / min, and the ball milling time is 2h;

[0066] Step 3: Put the NiCrAlY powder of the bonding layer and the composite powder prepared in Step 2 into a drying oven for drying at a drying temperature of 200°C and a drying time of 2 hours;

[0067] Step 4: Put the NiCrAlY powder ...

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Abstract

The invention provides a coating for improving abrasion resistance of a ship gas turbine compressor drum and a preparation method of the coating. A gas turbine compressor drum alloy matrix is pretreated; ceramic fiber is pretreated, then, 18%-80% of YSZ powder, 18%-80% of Al2O3 powder and 2%-20% of the ceramic fiber are mixed proportionally by mass to obtain a mixture, and the mixture is subjected to ball milling treatment, so that ceramic composite powder is obtained; a bonding layer is sprayed to the surface of the gas turbine compressor drum alloy matrix through a plasma spraying method; and a ceramic composite working layer continues to be sprayed to the bonding layer through plasma spraying. According to the coating and the preparation method of the coating, the problem that a ceramic coating is high in brittleness and poor in toughness is solved by adding the ceramic short fiber, fiber tightening is achieved in the plasma ceramic coating, the rupture work of the composite coating in the friction and abrasion processes is increased, brittle lamellar type peeling of the ceramic coating is relieved, and the purpose of improving the abrasion resistance is achieved.

Description

technical field [0001] The invention relates to the surface modification of metal materials, in particular to a wear-resistant coating for a marine gas turbine compressor drum and a preparation method thereof. Background technique [0002] With the rapid development of marine gas turbines in my country, modern ships have higher and higher performance requirements for gas turbines. The high-pressure compressor rotor is one of the main components of the gas turbine, which is used to pressurize the air entering the gas turbine to make the air pressure reach a predetermined value. The high-pressure compressor rotor requires high efficiency, reliable operation, good rigidity, and light weight. It is mainly reflected in the following aspects: ①Compact structure, light weight, the unit power mass of the structural unit is less than 1Kg / Kw. ②Small size can save space when using. ③Starting block, from cold start to full load, depending on the power of the unit and the structure ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/073C23C4/08C23C4/10C23C4/11C23C4/134
CPCC23C4/08C23C4/10
Inventor 金国汪倡崔秀芳张丹张梦月侯兴隆
Owner HARBIN ENG UNIV
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