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Mo-Mo+Si+Al functionally graded material and preparation method thereof

A technology of functionally graded materials and gradient distribution, which is applied in the coating process of metal materials, layered products, coatings, etc., and can solve problems such as slow diffusion, complexity, and impact on industrialization development

Inactive Publication Date: 2010-05-12
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, the preparation of functionally graded materials is still in the exploratory stage. The above-mentioned Mo-MoSi 2 There are the following deficiencies in functionally graded materials and preparation methods: (1) The diffusion rate of Si in the matrix is ​​slow during the preparation process, resulting in too long a time-consuming preparation of materials with a gradient layer thickness greater than 200 μm, which affects its industrialization development; (2) Existing Mo-MoSi 2 The gradient layer of functionally graded materials is relatively thin, and microcracks may occur on the surface if you do not pay attention during transportation and use, while Mo-MoSi 2 The self-healing ability of microcracks in functionally graded materials is poor, which shortens the life of the material when used in a high-temperature oxidizing atmosphere; (3) It is difficult to prepare products with complex shapes and large sizes by existing methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Take 495g of metal Si with a purity >99.9% and 5g of No. 1 Al, put the above two metals into a corundum crucible, put the crucible into an argon-protected electric furnace and raise the temperature to 1440°C, and keep the temperature for 30min; The 20mm×20mm×3mm pure molybdenum plate suspended by platinum wire is put into the molten Si-Al alloy, and after hot dipping at a temperature of 1440°C for 3 minutes, the treated molybdenum plate is taken out from the molten Si-Al alloy. After staying in the temperature section of the electric furnace with a temperature of ≥1440°C for 10 minutes, cool to room temperature at a cooling rate of ≤20°C / min. The results of surface morphology, section thickness, silicon and aluminum content distribution, and section X-ray diffraction analysis of the impregnated layer show that the surface of the obtained sample is dense and smooth, and the Si and Al contents on the surface of the gradient layer are 61% and 0.6% (by mass) respe...

Embodiment 2

[0019]Example 2: Take 485g of metal Si with a purity > 99.9% and 15g of No. 1 Al, put the above two metals into a corundum crucible, put the crucible into an argon-protected electric furnace and raise the temperature to 1470°C, and keep the temperature for 30min; suspended by platinum wire Put a 10mm×20mm pure molybdenum rod into the molten Si-Al alloy, and after hot dipping at a temperature of 1470°C for 16 minutes, take out the treated molybdenum rod from the molten Si-Al alloy, and place it in an electric furnace with a temperature ≥ 1440 After staying in the temperature section of ℃ for 10 minutes, cool to room temperature at a cooling rate of ≤20℃ / min. The surface morphology of the infiltrated layer, the thickness of the section, the content distribution of silicon and aluminum, and the X-ray diffraction analysis of the section show that the surface of the obtained sample is dense and smooth, and the Si and Al contents on the surface of the gradient layer are 73% and 2.2...

Embodiment 3

[0020] Example 3: Take 475g of metal Si with a purity >99.9% and 25g of No. 1 Al, put the above two metals into a corundum crucible, put the crucible into an electric furnace protected by argon and raise the temperature to 1500°C, and keep the temperature for 3min; Put the 20mm×20mm×3mm pure molybdenum plate suspended by platinum wire into the molten Si-Al alloy, and after hot-dipping at a temperature of 1440°C for 35min, take out the treated molybdenum plate from the molten Si-Al alloy, After staying in the temperature section of the electric furnace with a temperature of ≥1440°C for 10 minutes, cool to room temperature at a cooling rate of ≤20°C / min. The surface morphology of the impregnated layer, the thickness of the section, the content distribution of silicon and aluminum, and the X-ray diffraction analysis of the section show that the surface of the obtained sample is dense and smooth, and the Si and Al contents on the surface of the gradient layer are 85% and 4.3% (by m...

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Abstract

The invention relates to an Mo-Mo+Si+Al functionally graded material and a preparation method thereof, belonging to the technical field of metallurgical materials and used for solving the problems of thin gradient layer and poor microcrack self-healing property of the functionally graded material. The Mo-Mo+Si+Al functionally graded material is characterized in that metal Mo is used as a basal body, a gradient distribution layer is arranged outside the basal body, wherein the contents of Si and Al in the gradient distribution layer gradually increase. The material has the change law of the components form inner phase to outer phase as follows: Mo-Mo5Si3+Mo3Si+Al4Mo+Mo-Mo5Si3+MoSi2+Al4Mo-MoSi2+Al4Mo+Si. The preparation method of the material comprises the steps of preparing a Si-Al alloy penetrating source, diffusing Si and Al in a molybdenum basal body, cooling the material and the like. The material has thick gradient layer and strong microcrack self-healing property; and the method has the characteristics of high forming speed of the gradient layer, short preparation time of the gradient layer, easy process control and the like.

Description

technical field [0001] The invention relates to a metal material and a preparation method thereof, in particular to a Mo-Mo+Si+Al functional gradient material and a preparation method thereof, belonging to the technical field of metallurgical materials. Background technique [0002] The idea of ​​functionally graded materials was proposed by the Japanese National Astronautics Laboratory in 1984 in order to adapt to the development of aerospace technology. By 1987, Japanese scholars Masaoyuki Shinno, Toshio Hirai and Ryuzo Watanabe formed a brand-new concept of functionally graded materials, which soon aroused great interest and attention of scientists from all over the world, and were applied to nuclear energy, biomedicine, Machinery, petrochemical, information, civil and construction fields. The key feature of functionally graded materials is to control the composition and organization of the interface to change continuously, so that two or more materials with different pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/04C23C10/26
Inventor 李运刚张士宪王艳春梁精龙田薇李杰
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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