Preparation method of ceramic thermal control coating layer with low solar absorption ratio and high infrared radiation rate and growing on surface of magnesium-lithium alloy in situ

A technology of solar absorption ratio and magnesium-lithium alloy, which is applied in the field of preparation of magnesium-lithium alloy functionalized thermal control coating, can solve problems such as inability to apply thermal control system, achieve wide application range, good thermal shock resistance, and coating uniform effect

Active Publication Date: 2014-12-24
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing magnesium-lithium alloy itself has infrared radiation rate and cannot be applied to the thermal control system,

Method used

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  • Preparation method of ceramic thermal control coating layer with low solar absorption ratio and high infrared radiation rate and growing on surface of magnesium-lithium alloy in situ
  • Preparation method of ceramic thermal control coating layer with low solar absorption ratio and high infrared radiation rate and growing on surface of magnesium-lithium alloy in situ
  • Preparation method of ceramic thermal control coating layer with low solar absorption ratio and high infrared radiation rate and growing on surface of magnesium-lithium alloy in situ

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specific Embodiment approach 1

[0019] Specific Embodiment 1: This embodiment is a method for preparing a ceramic thermal control coating with low solar absorption ratio and high emissivity grown in situ on the surface of a magnesium-lithium alloy, which is specifically completed according to the following steps: The preparation method of the ceramic thermal control coating with low solar absorption ratio and high infrared emissivity grown in situ on the surface is specifically completed according to the following steps:

[0020] 1. Pretreatment of magnesium-lithium alloy: First, use 240# water-grit paper, 400# water-grit paper and 1000# water-grit paper to polish the magnesium-lithium alloy, and then use acetone and deionized water to clean and polish the magnesium-lithium alloy. Blowing and drying to obtain the treated magnesium-lithium alloy;

[0021] 2. Micro-arc oxidation: place the treated magnesium-lithium alloy in a stainless steel electrolytic cell, connect the processed magnesium-lithium alloy to t...

specific Embodiment approach 2

[0029] Embodiment 2: This embodiment differs from Embodiment 1 in that: the main film-forming agent is silicate or zirconate. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the auxiliary film-forming agent is phosphate or sodium fluoride. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method for a ceramic thermal control coating layer with low solar absorption ratio and high infrared radiation rate and growing on the surface of magnesium-lithium alloy in situ, relates to a preparation method for a magnesium-lithium alloy functionalized thermal control coating layer, and aims at solving the problem that the conventional magnesium-lithium alloy is low in infrared radiation rate and cannot be applied to a thermal control system. The preparation method comprises the steps of 1, pretreatment of the magnesium-lithium alloy; 2, micro-arc oxidation to obtain the ceramic thermal control coating layer which has low solar absorption ratio and high infrared radiation rate and grows on the surface of the magnesium-lithium alloy in situ. The coating layer prepared by the preparation method is high in bonding strength to a base body and high in thermal shock resistance; the solar absorption ratio is 0.22-0.40, and the radiation rate is 0.9-0.97. The application range of the magnesium-lithium alloy in the space field is expanded, and the weight of the ceramic thermal control coating layer is lighter than that of an aluminum-based coating layer by 30-40 percent. The invention provides the preparation method which is used for obtaining the ceramic thermal control coating layer which has low solar absorption ratio and high infrared radiation rate and grows on the surface of magnesium-lithium alloy in situ.

Description

technical field [0001] The invention relates to a preparation method of a magnesium-lithium alloy functional thermal control coating. Background technique [0002] Magnesium-lithium alloy is the lightest metal structure material in the world, 1 / 4-1 / 3 lighter than ordinary magnesium alloy, 1 / 3-1 / 2 lighter than aluminum alloy, and is called ultra-light alloy. In addition, magnesium-lithium alloys have good thermal conductivity, electrical conductivity, ductility, and electromagnetic shielding properties, and are widely used in aerospace, national defense and military industries. Especially in the field of aerospace, when the carrying mass is reduced by 1kg, the launch cost of the rocket will be reduced by more than 20,000 US dollars. Therefore, to broaden the application of magnesium-lithium alloys in the space field, in addition to being used as structural materials, aerospace workers have turned their attention to the functional design of magnesium-lithium alloys. [0003]...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 姚忠平夏琦兴李超楠姜兆华
Owner HARBIN INST OF TECH
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