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High-temperature-resistant composite ceramic insulating coating and preparation method thereof

A composite ceramic and insulating coating technology, applied in the direction of coating, metal material coating technology, high-efficiency propulsion technology, etc., can solve the problems of easy aging of resin-based sealing layer, insufficient reliability, low high temperature oxidation resistance, etc. To ensure insulation and service life, improve environmental adaptability and durability, improve density and surface hardness

Active Publication Date: 2021-04-30
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of pores or cracks seriously affects the bonding strength and insulation of the insulating coating; at the same time, some corrosive media reach the surface of the substrate through the pores or cracks, causing corrosion to the coating and the substrate
The accumulation of corrosion products will lead to cracking and peeling of the coating, which will eventually lead to the failure of the coating
In the prior art, a resin-based sealing layer is usually used to reduce the impact of defects in the plasma spraying process on the performance of the insulating coating; however, the resin-based sealing layer is prone to aging and wear in a micro-friction environment. problems, poor environmental adaptability, and insufficient long-term reliability
At the same time, in the prior art, metals such as Ni and NiCr are usually used as transition layers for oxide ceramic insulating coatings, but these transition layers have low high temperature oxidation resistance and are prone to oxidation in an alternating temperature environment, causing the insulating coating Layer cracking, resulting in lower insulation performance

Method used

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  • High-temperature-resistant composite ceramic insulating coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] NiCrAlY is used as the material of transition layer 2 and metal layer 4, and Al 2 o 3 As the intermediate layer 3 material, Al 2 o 3 +13%TiO 2 As the surface layer 5 material, a composite ceramic insulating coating is prepared on the surface of the stainless steel substrate; the specific steps are:

[0030] S001. Pretreatment of the substrate: first soak the stainless steel substrate in acetone to remove oil stains, then perform ultrasonic cleaning of the stainless steel substrate with anhydrous ethanol as the cleaning medium, and finally dry it; then use brown corundum with a particle size of 40 mesh as the sandblasting material The surface of the stainless steel substrate is sandblasted; finally, the stainless steel substrate is preheated, the preheating temperature is 200 ° C, and the time is 3 minutes;

[0031] S002, preparation of the transition layer 2: prepare the transition layer 2 of NiCrAlY by plasma spraying, the spraying power is 20kW, and the spraying d...

Embodiment 2

[0038] A mixed alloy of NiCrAlY and NiCoCrAlY is used as the transition layer 2 and metal layer 4 materials, and ZrO 2 As the intermediate layer 3 material, Al 2 o 3 +28%TiO 2 As the surface layer 5 material, a composite ceramic insulating coating is prepared on the surface of the aluminum alloy substrate; the specific steps are:

[0039] S001. Pretreatment of the substrate: first soak the aluminum alloy substrate with acetone to remove oil stains, then perform ultrasonic cleaning of the aluminum alloy substrate with absolute ethanol as the cleaning medium, and finally dry it; then use white corundum with a particle size of 80 mesh as sandblasting The material is sand blasted on the surface of the aluminum alloy substrate; finally, the aluminum alloy substrate is preheated, the preheating temperature is 250 ° C, and the time is 5 minutes;

[0040] S002, preparation of transition layer 2: adopt plasma spraying to prepare the transition layer 2 of the mixed alloy of NiCrAlY a...

Embodiment 3

[0047] NiCoCrAlY is used as the material of transition layer 2 and metal layer 4, and Al 2 o 3 As the intermediate layer 3 material, Al 2 o 3 +40%TiO 2 As the surface layer 5 material, a composite ceramic insulating coating is prepared on the surface of the titanium alloy substrate; the specific steps are:

[0048] S001. Pretreatment of the substrate: first soak the titanium alloy substrate with acetone to remove oil stains, then perform ultrasonic cleaning of the titanium alloy substrate with anhydrous ethanol as the cleaning medium, and finally dry it; then use brown corundum with a particle size of 40 mesh as sandblasting The material is sand blasted on the surface of the titanium alloy substrate; finally, the titanium alloy substrate is preheated, the preheating temperature is 200 ° C, and the time is 3 minutes;

[0049] S002, preparation of the transition layer 2: prepare the transition layer 2 of NiCoCrAlY by plasma spraying, the spraying power is 30kW, and the spray...

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Abstract

The invention provides a high-temperature-resistant composite ceramic insulating coating. A transition layer (2) made of a metal compound material, a middle layer (3) made of pure ceramic, a metal layer (4) made of a metal compound material and a surface layer (5) with holes sealed by metal oxide ceramic are sequentially arranged on the surface of an alloy matrix (1) outwards. The composite ceramic insulating coating is obtained by sequentially pretreating a base body, sequentially preparing the transition layer (2), the middle layer (3), the metal layer (4) and the surface layer (5) by adopting plasma spraying and finally performing laser cladding on the surface layer (5). The high-temperature-resistant composite ceramic insulating coating is good in high-temperature oxidation resistance, high in insulativity, excellent in environmental adaptability and high in working reliability.

Description

technical field [0001] The invention relates to the technical field of thermal spraying coatings, in particular to a high-temperature-resistant composite ceramic insulating coating and a preparation method thereof. Background technique [0002] Insulating coating refers to the surface protective coating that electrically insulates the workpiece. According to the chemical composition, it is mainly divided into two types: polymer insulating coating and inorganic insulating coating. The oxide ceramics in the inorganic insulating coating have high hardness and resistance High temperature, oxidation resistance, corrosion resistance, high electrical insulation and low dielectric loss have been widely used in electric power, electrical machinery, electronics, weaponry, aerospace and other fields. Oxide ceramics have a high melting point, and it is difficult for general gas arc and flame to melt them, so they are usually prepared by plasma spraying process. However, during the plas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/11C23C4/18
CPCC23C4/134C23C4/073C23C4/11C23C4/18Y02T50/60
Inventor 李忠盛彭冬吴护林黄安畏何庆兵宋凯强白懿心赵子鹏王旋
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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