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High-temperature-resistant aluminum alloy ceramic membrane

A technology of ceramic film and aluminum alloy, applied in the field of aluminum alloy surface, can solve the problems of poor impact resistance, poor thermal stability, large thermal deformation, etc., to prevent the diffusion of oxygen, improve high temperature oxidation resistance, and improve thermal shock resistance. Effect

Inactive Publication Date: 2021-06-08
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, aluminum alloy also has its own shortcomings, such as low hardness, poor toughness, low hardness, no wear resistance, no impact resistance, large thermal conductivity coefficient, large thermal deformation, poor thermal stability, etc.

Method used

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  • High-temperature-resistant aluminum alloy ceramic membrane
  • High-temperature-resistant aluminum alloy ceramic membrane
  • High-temperature-resistant aluminum alloy ceramic membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. The sample is made of aluminum alloy plate, cut into 25mm×20mm×2mm, and holes are punched on the edge of the sample for connecting wires;

[0021] 2. Use sandpaper to polish the surface of the sample to 1200#, put it into an ultrasonic cleaner, clean it with absolute ethanol, and dry it for later use;

[0022] 3. Electrolyte adopts silicate system, sodium silicate nonahydrate 10gˑL -1 ,Potassium hydroxide 3gˑL -1 ; Additive CeO 2 5gˑL -1 ;

[0023] 4. Use bi-directional pulse power supply, adopt constant voltage mode, positive voltage is 300V, negative voltage is 70V, positive pulse width is 1000μs, negative pulse width is 1000μs, pulse interval is 300μs, oxidation time is 15min. Wash with ionized water and absolute ethanol, and blow dry;

[0024] 5. Put it into a box-type resistance furnace, set the temperature at 400°C, hold for 10 hours, and observe the appearance as figure 1 .

Embodiment 2

[0026] 1. The sample is made of aluminum alloy plate, cut into 25mm×20mm×2mm, and holes are punched on the edge of the sample for connecting wires;

[0027] 2. Use sandpaper to polish the surface of the sample to 1200#, put it into an ultrasonic cleaner, clean it with absolute ethanol, and dry it for later use;

[0028] 3. Electrolyte adopts silicate system, sodium silicate nonahydrate 15gˑL -1 ,Potassium hydroxide 5gˑL -1 ; Additive CeO 2 4gˑL -1 ;

[0029] 4. Use bi-directional pulse power supply, adopt constant voltage mode, positive voltage is 300V, negative voltage is 80V, positive pulse width is 1000μs, negative pulse width is 1000μs, pulse interval is 300μs, oxidation time is 15min. Wash with ionized water and absolute ethanol, and blow dry;

[0030] 5. Put it into a box-type resistance furnace, set the temperature at 450°C, hold for 10 hours, and observe the appearance as figure 2 .

Embodiment 3

[0032] 1. The sample is made of aluminum alloy plate, cut into 25mm×20mm×2mm, and holes are punched on the edge of the sample for connecting wires;

[0033] 2. Use sandpaper to polish the surface of the sample to 1200#, put it into an ultrasonic cleaner, clean it with absolute ethanol, and dry it for later use;

[0034] 3. Electrolyte adopts silicate system, sodium silicate nonahydrate 20gˑL -1 , Potassium hydroxide 7gˑL -1 ; Additive CeO 2 3gˑL -1 ;

[0035] 4. Use bi-directional pulse power supply, adopt constant voltage mode, positive voltage is 300V, negative voltage is 80V, positive pulse width is 1000μs, negative pulse width is 1000μs, pulse interval is 300μs, oxidation time is 15min. Wash with ionized water and absolute ethanol, and blow dry;

[0036] 5. Put it into a box-type resistance furnace, set the temperature at 500°C, and hold it for 10 hours. Observe the appearance as image 3 .

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Abstract

The invention relates to a high-temperature-resistant aluminum alloy ceramic membrane. The high-temperature-resistant aluminum alloy ceramic membrane is prepared by using a micro-arc oxidation method, adopting a silicate system as an electrolyte, adding an additive and using a bidirectional pulse power supply. The aluminum alloy ceramic membrane has high-temperature oxidation resistance and thermal shock resistance. An aluminum alloy can be effectively protected, so that the aluminum alloy has better use performance in a high-temperature environment. During treatment, no waste gas or waste liquid is generated, the adopted materials are non-toxic, and green and sustainable development can be achieved.

Description

technical field [0001] The invention relates to a high-temperature-resistant ceramic coating, which is suitable for the surface of aluminum alloy. Background technique [0002] As a common non-ferrous metal in industry, aluminum alloy has high specific strength, good machinability, good thermal and electrical conductivity, and is widely used in aerospace, automobile manufacturing, defense industry, electronic products and other fields. However, aluminum alloy also has its own disadvantages, such as low hardness, poor toughness, low hardness, no wear resistance, no impact resistance, large thermal conductivity, large thermal deformation, and poor thermal stability. If aluminum alloy pistons are used in the engine, they need to work in a high temperature and high pressure environment, and need to withstand the erosion of high temperature gas. At present, the key way to achieve high efficiency in engine technology is high speed and high combustion pressure. Aluminum alloy is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06
CPCC25D11/026C25D11/024C25D11/06
Inventor 马国峰刘志扬张鸿龄史德阳贺春林
Owner SHENYANG UNIV
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