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Thermal spraying alumina-yttrium oxide composite ceramic coating and preparation method thereof

A technology of yttrium oxide and composite ceramics, which is applied in the field of wear-resistant ceramic coatings, can solve the problems of reduced high-temperature creep resistance of coatings, decreased coating hardness and strength, and many grain boundaries of coatings, and achieves strength and toughness. Improved thermal shock resistance, improved wear resistance and effective life, and better interface bonding between coating layers

Active Publication Date: 2018-12-07
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem brought about like this is: ZrO 2 Or YSZ has a low thermal conductivity and a large thermal expansion coefficient. Under the conditions of high temperature, high specific pressure, strong thermal shock and combined wear, it is easy to accumulate thermal stress inside the coating and on the coating / substrate interface, resulting in stress concentration. Coating micro-cracks expand, shortening the wear life of composite ceramic coatings
④ Gradient coating toughening often requires the preparation of more single layers for superimposition. The thickness of each single layer is limited, and different composition or structure control is required. Hardness and strength are not ideal
The above improved Al 2 o 3 Some progress has been made in the research of coating strength and toughness, but there are still some problems: ①The high frictional heat generated under harsh wear conditions leads to the instability of the nanostructure of the coating; The effect is large, resulting in a decrease in thermal conductivity, which is not conducive to the application under severe wear conditions; ③The addition of metal phases reduces the hardness and strength of the coating, which is not conducive to its service under harsh conditions, and the interface between the metal phase and the ceramic matrix is ​​combined Performance is difficult to control; ④TiO 2 The addition of the coating reduces the high-temperature creep resistance of the coating and the high-temperature mechanical properties; ⑤The solid solution will re-precipitate under repeated high-low temperature service environments, which destroys the structure and performance of the solid solution in the sprayed coating

Method used

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  • Thermal spraying alumina-yttrium oxide composite ceramic coating and preparation method thereof
  • Thermal spraying alumina-yttrium oxide composite ceramic coating and preparation method thereof
  • Thermal spraying alumina-yttrium oxide composite ceramic coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Thermal spraying aluminum oxide-yttrium oxide composite ceramic coating and preparation method thereof, the method comprises the following steps:

[0044] (1) Pretreatment of the metal substrate, including: roughening and purification of the pre-sprayed surface of the metal substrate. Two kinds of 2Cr13 stainless steel substrates: ①Square piece (30mm×15mm×1.25mm); ②Circular ring (Φ40mm×Φ16mm×10mm) is first sandblasted with 20# white corundum sand, and the working pressure is 0.4 ~0.5MPa, then ultrasonic cleaning with ethanol for 5 minutes, and then dry it with compressed air. The average surface roughness Ra of the stainless steel substrate after pretreatment is 7.32 μm;

[0045] (2) Aluminum oxide-yttrium oxide composite ceramic coating is deposited on the surface of the treated metal substrate by thermal spraying process. First, the aluminum oxide powder with a particle size of 15-45 μm and the yttrium oxide powder with a particle size of 15-45 μm were mechanically ...

Embodiment 2

[0049] Thermal spraying aluminum oxide-yttrium oxide composite ceramic coating and preparation method thereof, the method comprises the following steps:

[0050] (1) Pretreatment of the metal substrate, including: roughening and purification of the pre-sprayed surface of the metal substrate

[0051] The metal substrate selection and pretreatment method are the same as in Example 1. After pretreatment, the average surface roughness Ra of the stainless steel substrate was 6.56 μm. The square sample is used for section morphology observation and thermal shock test, and the ring sample is used for friction and wear test;

[0052] (2) Aluminum oxide-yttrium oxide composite ceramic coating is deposited on the surface of the treated metal substrate by thermal spraying process

[0053]The preparation method of selecting the composite powder is the same as that of Example 1, except that the mass fraction of yttrium oxide powder is 40%. The nickel-chromium alloy stress transition lay...

Embodiment 3

[0057] Thermal spraying aluminum oxide-yttrium oxide composite ceramic coating and preparation method thereof, the method comprises the following steps:

[0058] (1) Pretreatment of the metal substrate, including: roughening and purification of the pre-sprayed surface of the metal substrate. The metal substrate selection and pretreatment method are the same as in Example 1. The average surface roughness Ra of the stainless steel substrate after pretreatment is 8.19 μm;

[0059] (2) Aluminum oxide-yttrium oxide composite ceramic coating is deposited on the surface of the treated metal substrate by thermal spraying process

[0060] The preparation method of selecting the composite powder is the same as that of Example 1, except that the mass fraction of yttrium oxide powder is 20%. The nickel-aluminum alloy stress transition layer is first sprayed on the surface of the treated 2Cr13 stainless steel substrate. The particle size distribution range of the alloy powder is 35-55 μm...

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Abstract

The invention relates to a thermal spraying aluminum oxide-yttrium oxide composite ceramic coating and a preparing method thereof. The aluminum oxide-yttrium oxide composite ceramic coating is formed on a metal substrate or formed on a stress transition layer located on the surface of the metal substrate; and the aluminum oxide-yttrium oxide composite ceramic coating comprises an alpha-Al2O3 phase, a gamma-Al2O3 phase, a c-Y2O3 phase, an m-Y2O3 phase and a YxAlyOz phase generated by aluminum oxide and yttrium oxide in situ, wherein YxAlyOz is Y3Al5O12, Y4Al2O9 and / or YAlO3, and the mass ratio of the alpha-Al2O3 phase to the gamma-Al2O3 phase is 1:(2-3). The aluminum oxide-yttrium oxide composite ceramic coating prepared through a thermal spraying process is compact in structure and lower in gas hole ratio. Solid solution between the Al2O3 and Y2O3 is avoided, a YxAlyOz compound can be generated in situ in the spraying process, and the effects of dispersion toughening and phase interface strengthening are achieved; and bonding of interlayer interfaces between coatings is better, the obdurability and the thermal shock resistance are improved.

Description

technical field [0001] The invention relates to a thermal spraying alumina-yttrium oxide composite ceramic coating and a preparation method thereof, belonging to the technical field of wear-resistant ceramic coatings. Background technique [0002] Oxide ceramic materials have the characteristics of high strength, high hardness, wear resistance, high temperature resistance, oxidation resistance, corrosion resistance, etc., and show good comprehensive performance. They are used as thermal spray coating materials for high specific pressure (ie high PV value : P is the contact pressure; V is the friction rate), high temperature, oxygen-enriched, strong thermal shock, strong corrosion and other harsh wear service conditions have good potential, and can combine the advantages of metal substrate and oxide ceramic coating, Good engineering applications are expected. However, oxide ceramics have low ductility and high crack sensitivity, which restrict their applications. Previous r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/11C23C4/134
CPCY02T50/60
Inventor 杨凯荣建刘晨光赵华玉庄寅倪金星邵芳陶顺衍
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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