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Metal surface heat protecting coating structure and preparation method and composite material thereof

A technology for metal surface and thermal protection, applied in the direction of surface reaction electrolytic coating, alkali metal silicate coating, metal material coating technology, etc. Problems such as cracking and peeling, achieve high bonding stability, improve bonding force, and increase stability

Pending Publication Date: 2020-08-28
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The problem to be solved by the invention is that light metals have poor high temperature resistance. In the existing thermal protection and heat insulation coating prepared on the metal surface, the thermal expansion coefficient between the metal substrate and the heat insulation coating does not match, which easily leads to cracking and peeling off of the heat insulation coating.

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  • Metal surface heat protecting coating structure and preparation method and composite material thereof
  • Metal surface heat protecting coating structure and preparation method and composite material thereof
  • Metal surface heat protecting coating structure and preparation method and composite material thereof

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preparation example Construction

[0039] Embodiments of the present invention also provide a method for preparing a metal surface thermal protection coating structure, such as figure 2 shown, including steps:

[0040] S1, preparing a micro-arc oxidation transition layer 2 on the surface of the metal substrate 1 by micro-arc oxidation technology, as follows:

[0041]The micro-arc oxidation electrolyte is configured so that the micro-arc oxidation transition layer 2 contains at least one of aluminum oxide, magnesium oxide, titanium oxide, magnesium silicate and aluminum silicate, thus, the micro-arc oxidation transition layer 2 is in contact with During the bonding process of the ceramic coating 3, a high-strength chemical bond will be formed to improve the interfacial bonding force. In addition, it is necessary to ensure that the surface of the micro-arc oxidation transition layer 2 is a porous structure with large pores, so as to strengthen its bonding strength with the heat-insulating outer layer. In this ...

Embodiment 1

[0054] In order to solve the problems of poor high temperature resistance of light metals and the mismatch of thermal expansion coefficients between the metal substrate 1 and the coating, this embodiment provides a method for preparing a metal surface thermal protection coating structure. The method includes the following steps:

[0055] 1. Preparation of micro-arc oxidation transition layer on the surface of AZ80 magnesium alloy 2

[0056] 1.1. The electrolyte required for configuration is: mix and stir 20g / L sodium silicate, 10g / L potassium fluoride, 5g / L sodium hydroxide and deionized water, fully dissolve into a solution, and prepare the micro-arc oxidation electrolyte;

[0057] 1.2. Using the AZ80 magnesium alloy metal substrate 1 as the anode and the steel plate as the cathode, under the action of a pulse voltage of 300V, liquid-phase plasma-assisted sintering was carried out for 15 minutes to obtain a micro-arc oxidation transition layer 2 with a thickness of 50 μm.

[...

Embodiment 2

[0065] In order to solve the problems of poor high temperature resistance of light metals and the mismatch of thermal expansion coefficients between the metal substrate 1 and the coating, this embodiment provides a method for preparing a metal surface thermal protection coating structure. The method includes the following steps:

[0066] 1. Preparation of micro-arc oxidation transition layer on the surface of AZ31b magnesium alloy 2

[0067] 1.1. The electrolyte required for configuration is: mix and stir 16g / L sodium silicate, 10g / L potassium fluoride, 8g / L sodium hydroxide and deionized water, fully dissolve into a solution, and obtain a micro-arc oxidation electrolyte;

[0068] 1.2. Using the AZ31b magnesium alloy metal substrate 1 as the anode and the steel plate as the cathode, under the action of 400V pulse voltage, the liquid phase plasma assisted sintering reaction was carried out for 10 minutes to obtain the micro-arc oxidation transition layer 2 with a thickness of 10...

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Abstract

The invention provides a metal surface heat protecting coating structure and a preparation method and composite material thereof. The metal surface heat protecting coating structure comprises a micro-arc oxidization transition layer and a ceramic coating, wherein the micro-arc oxidization transition layer and the ceramic coating are sequentially arranged on the surface of a metal base body from inside to outside. The ceramic coating comprises multiple subsidiary layers with the thermal expansion coefficient and the heat conductivity descending in a gradient manner from inside to outside. According to the heat protecting coating structure, the outer layer ceramic coating is designed into a multi-layer composite structure with the thermal expansion coefficient and the heat conductivity changing in a gradient manner, thus the thermal expansion difference between the coatings is reduced, the interface stress between a base body and the coatings is relieved, and the stability of the coatingoverall structure is improved. In addition, the micro-arc oxidization transition layer is guided between the metal base body and the ceramic coating, the stress between the metal base body and the ceramic coating can be relieved effectively, and meanwhile, the binding force between the ceramic coating and the metal base body is further increased.

Description

technical field [0001] The invention relates to the technical field of light metal thermal protection, in particular to a metal surface thermal protective coating structure, a preparation method thereof, and a composite material. Background technique [0002] In recent years, with the rapid development of aerospace science and technology, the application of lightweight metals (magnesium, aluminum, titanium alloys) and their composite materials in spacecraft and aircraft is increasing day by day. However, due to the low melting point and poor high temperature resistance of light metals, their wide application is severely limited. Coating modification technology is the most direct and effective means to improve the high temperature resistance of light metals. The commonly used preparation technologies for thermal protection and insulation coatings mainly include plasma spraying, supersonic flame spraying, electron beam physical vapor deposition, plasma physical vapor depositio...

Claims

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Application Information

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IPC IPC(8): C23C28/04C25D11/30C04B35/48C09D1/02C09D1/00C09D7/61
CPCC23C28/04C25D11/026C25D11/024C25D11/30C04B35/48C09D1/02C09D1/00C09D7/61C09D7/70
Inventor 王亚明刘哲铭邹永纯李君龙于江祥贾德昌周玉
Owner HARBIN INST OF TECH
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