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Micro-nano gradient structure heat insulation coating and preparation method thereof

A gradient structure, thermal insulation coating technology, applied in coating, metal material coating technology, nanotechnology, etc., can solve the problems of TGO layer thickening failure, unable to hinder oxygen oxidation, coating easy to fall off, etc., to achieve excellent Heat insulation effect, excellent anti-oxidation and anti-shedding effect, high-efficiency preparation effect

Pending Publication Date: 2021-04-27
GUANGDONG DELUXE METAL PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But on the one hand, because YSZ is a good conductor of oxygen at high temperature, it cannot hinder the entry of oxygen to oxidize the substrate, resulting in the thickening and final failure of the TGO layer; on the other hand, the coating is easy to fall off due to the sudden change of the thermal stress field, and limited thickness

Method used

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  • Micro-nano gradient structure heat insulation coating and preparation method thereof
  • Micro-nano gradient structure heat insulation coating and preparation method thereof
  • Micro-nano gradient structure heat insulation coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. Pretreatment: 316 stainless steel is selected as the substrate, and the size is Φ300mm*1.5mm in diameter. Use 150-1000# sandpaper to polish in sequence, and then use de-alcohol to clean and dry. The drying temperature is 150°C and the drying time is 1min.

[0050] 2. Sand blasting treatment: sandblasting the surface of the substrate to be sprayed, the air pressure is 0.3MPa, the distance is 80mm, the angle is 60°, and the nozzle diameter is 8mm;

[0051] 3. Dry MCrAlY powder (40-80 micron), 8YSZ micron ceramic powder (40-120 micron), 8YSZ nano-ceramic agglomerated powder (40-100 micron), 200°C / 2h;

[0052] 4. Parameter setting: Spraying voltage is 80V, current is 200A, main gas is 60L / min, secondary gas is 2L / min, powder feeding gas is 2L / min, powder feeding speed is 30g / min, spraying distance is 100mm, The spraying speed is 20mm / s;

[0053] 5. Spraying: First spray the NiCrAlY layer with a thickness of 60 microns, and then spray micron 8% YSZ powder and nanometer ...

Embodiment 2

[0057] 1. Pretreatment: 316 stainless steel is selected as the substrate, and the size is Φ300mm*1.5mm in diameter. Use 150-1000# sandpaper to polish in sequence, and then use de-alcohol to clean and dry. The drying temperature is 150°C and the drying time is 1min.

[0058] 2. Sandblasting: Sandblasting the surface of the substrate to be sprayed, the air pressure is 0.3MPa, the distance is 80mm, the angle is 60°, and the nozzle diameter is 8mm;

[0059] 3. Dry MCrAlY powder (40-80 micron), 8YSZ micron ceramic powder (40-120 micron), 8YSZ nano-ceramic agglomerated powder (40-100 micron), and the drying condition is 200°C for 2 hours ;

[0060] 4. Parameter setting: Spraying voltage is 80V, current is 200A, main gas is 60L / min, secondary gas is 2L / min, powder feeding gas is 2L / min, powder feeding speed is 30g / min, spraying distance is 100mm, The spraying speed is 20mm / s;

[0061] 5. Spraying: First spray the NiCrAlY layer with a thickness of 60 microns, and then spray micron ...

Embodiment 3

[0065] 1. Pretreatment: 1050 aluminum alloy is selected as the substrate, and the size is Φ300mm*1.5mm in diameter. Use 150-1000# sandpaper to polish in sequence, and then use alcohol to clean and dry. The drying temperature is 150°C and the drying time is 1min.

[0066] 2. Sandblasting: sandblasting the substrate, air pressure 0.3MPa, distance 200mm, angle 60°, nozzle diameter 10mm;

[0067] 3. Dry MCrAlY powder (40-80 micron), 8YSZ micron ceramic powder (40-120 micron), 8YSZ nano-ceramic agglomerated powder (40-100 micron), and the drying condition is 200°C for 2 hours ;

[0068] 4. Parameter setting: Spraying voltage is 80V, current is 200A, main gas is 60L / min, secondary gas is 2L / min, powder feeding gas is 2L / min, powder feeding speed is 30g / min, spraying distance is 100mm, The spraying speed is 20mm / s;

[0069] 5. Spraying: first spray NiCrAlY layer with a thickness of 60 microns, and then spray micron La in turn 2 Zr 2 o 7 Rare earth zirconate powder and nano La ...

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Abstract

The invention belongs to the field of heat insulation coatings, and discloses a micro-nano gradient structure coating with the grain size in gradient distribution in the thickness direction of the coating and a preparation method of the micro-nano gradient structure coating. The micro-nano gradient structure coating can be used for a heat insulation and resistance layer of a high-temperature structure. The micro-nano gradient structure coating is composed of a high-temperature alloy anti-oxidation layer, a nanometer heat-resistant ceramic layer and a micrometer heat-resistant ceramic layer. The invention further discloses the preparation method of the heat insulation coating. Plasma spraying equipment is adopted for moving according to a set route for spraying, and therefore the coating which is uniform in thickness and provided with micron-nanometer ceramics arranged alternately is obtained. According to the micro-nano gradient structure heat insulation coating, the intrinsic heat insulation properties of coatings with different grain sizes can be fully utilized, the internal and external stress difference effect of the coating can be reduced to the maximum extent through gradient change, and the problem of coating falling caused by uneven stress distribution is solved to the maximum extent, so that the service life of the coating is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to a thermal insulation coating with a micro-nano gradient structure and a preparation method thereof. Background technique [0002] The application of thermal barrier coatings in the high temperature field has been relatively common and has been paid attention to, especially the application on different hot end parts of aerospace gas turbines is the top priority. The service of metal structural materials under complex high-temperature conditions is currently one of the largest high-tech core technologies that needs to be broken through. High-temperature creep, corrosive media, thermal cycles, thermal sintering, thermal shock, etc. will have a serious impact on related service components. . The current solutions mainly revolve around two directions, one is the performance optimization of superalloy structural materials, and the other is the research and development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/073C23C4/10C23C4/134C23C4/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C23C4/02C23C4/10C23C4/073C23C4/134
Inventor 张乐叶勤政梁炬灿彭韶华陈树清黄山简榆珉
Owner GUANGDONG DELUXE METAL PROD CO LTD