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Preparation of high-alpha-Al2O3-content coating on aluminum product surface

A high-content, aluminum-based technology, applied in metal material coating processes, coatings, solid-state diffusion coatings, etc., can solve the problems of serious pollution of synthetic organics, difficulty in obtaining, and high preparation costs

Inactive Publication Date: 2009-08-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of α-Al by MOCVD 2 o 3 The main disadvantage of the coating is that the synthetic organic matter is seriously polluted, the preparation cost is high, and it is difficult to obtain a high content of α-Al at a low temperature of 600 °C. 2 o 3 coating

Method used

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  • Preparation of high-alpha-Al2O3-content coating on aluminum product surface
  • Preparation of high-alpha-Al2O3-content coating on aluminum product surface
  • Preparation of high-alpha-Al2O3-content coating on aluminum product surface

Examples

Experimental program
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Effect test

example 1

[0024] The surface of 316L stainless steel is prepared with a pure aluminum coating on the surface by double-layer glow ionization technology as the substrate, such as figure 1 The single-cathode plasma oxidation device shown performs the oxidation treatment. Hang the stainless steel workpiece with pure aluminum coating on the surface in the center of the furnace cavity in the single-cathode plasma oxidation device, and connect it to the cathode in the furnace cavity; use a vacuum pump to evacuate the furnace cavity for 10 -3 Pa; fill the furnace cavity with argon gas, the air pressure is 35Pa; add 600V DC high voltage between the workpiece and the anode to preheat for half an hour; adjust the voltage between the workpiece and the anode to 550V; use a computer to control the temperature 100 through a digital signal processor In the range of ~600°C, feed oxygen and adjust the oxygen partial pressure to 2Pa; keep warm for 3 hours, then cool down to room temperature, and take out...

example 2

[0026] The pure aluminum coating was prepared on the surface of 316L stainless steel by double-layer glow ionization technology as the substrate, and the multi-cathode plasma oxidation device as shown in Yu 2 was used for oxidation treatment. First, hang the stainless steel workpiece with pure aluminum coating on the surface in the center of the furnace cavity in the multi-cathode plasma oxidation device, and connect it to the cathode in the furnace cavity; fix the aluminum source material on the source electrode, adjust the aluminum source material and the aluminum material The distance between the workpieces is 15mm; use a vacuum pump to evacuate the furnace cavity for 10 -3 Pa; fill the furnace cavity with argon gas, and the air pressure is 35Pa; add 600V DC high voltage between the workpiece and the anode to preheat for half an hour; then adjust the voltage between the workpiece and the anode to 250V, and add 600-950V DC high voltage; use a computer to control the temperat...

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Abstract

A preparation method for obtaining a high-content α-Al2O3 coating on the surface of an aluminum material. It belongs to the preparation method of α-Al2O3 coating. The method is to suspend the aluminum workpiece in the furnace cavity of a single-cathode plasma oxidation device or a multi-cathode plasma oxidation device, vacuumize 10-3Pa, fill with argon, and the air pressure is 20-45Pa. Apply 550-1500V high voltage between the aluminum workpiece and the anode, apply 250-450V DC high voltage between the aluminum workpiece and the anode in the multi-cathode plasma oxidation device, apply 600-950V DC high voltage between the source and the cathode, and control the temperature In the range of 100-600°C, fill with oxygen, adjust the oxygen partial pressure ratio to 1-10Pa, keep it warm for 1-6 hours, and then lower it to room temperature and take it out of the furnace to obtain α-Al2O3-coated aluminum pipes. The preparation method has low cost and simple process, and can obtain an α-Al2O3 coating with a content of 50% to 90% at a temperature lower than 600° C., and the coating thickness can reach 20 μm after 3 hours of oxidation treatment.

Description

Technical field: [0001] The invention provides a method for preparing high-content α-Al 2 o 3 A new method of coating, which can be obtained by plasma oxidation treatment of aluminum (material, film, foil, coating, coating, etc.), and the surface forms α-Al 2 o 3 The coating content is between 50% and 90%. This method is suitable for preparing wear-resistant, corrosion-resistant or hydrogen-resistant and hydrogen isotope coatings. It involves plasma oxidation, single cathode or multi-cathode oxidation and other oxidation technologies and types of deposition materials. Background technique: [0002] Alumina is a very important ceramic material, which has been widely used in aviation, metallurgy, machinery industry and other fields. As a functional ceramic, it has important applications in ceramic sensors, bioceramics, and immobilized enzyme carriers. α-Al 2 o 3 is thermodynamically stable Al 2 o 3 Mutually. It has many excellent properties, such as high strength, ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/12
Inventor 陶杰刘红兵徐江
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS