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

A technology of functionally graded materials and gradient distribution, which is applied in metal material coating technology, layered products, coatings, etc., and can solve the problems of slow diffusion, shortened life, and long time consumption

Inactive Publication Date: 2012-07-18
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 oxidative 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] Embodiment 1: take 495g of metal Si and 5g of No. 1 Al with a purity of >99.9%, put the above two metals in a corundum crucible, put the crucible into an argon-protected electric furnace and heat up to 1440 ° C, and keep the temperature constant for 30 min; A 20mm×20mm×3mm pure molybdenum plate suspended by platinum wire was put into the molten Si-Al alloy, and after hot infiltration at a temperature of 1440°C for 3 minutes, the treated molybdenum plate was taken out from the molten Si-Al alloy. After staying in the temperature section of the electric furnace with a furnace temperature of ≥1440°C for 10min, cool down to room temperature at a cooling rate of ≤20°C / min. The surface morphology, section thickness, distribution of silicon and aluminum content, and X-ray diffraction analysis of the infiltrated layer show that the surface of the obtained sample is dense and smooth, and the content of Si and Al on the surface of the gradient layer is 61% and 0.6% (mass), respect...

Embodiment 2

[0019]Embodiment 2: take 485g of metal Si and 15g of No. 1 Al with a purity of >99.9%, put the above two metals in a corundum crucible, put the crucible into an argon-protected electric furnace and heat up to 1470 ° C, constant temperature 30min; suspended with platinum wire The pure molybdenum rod of 10mm×20mm is put into the molten Si-Al alloy, and after hot infiltration at the temperature of 1470 ℃ for 16min, the treated molybdenum rod is taken out from the molten Si-Al alloy, and the temperature of the electric furnace is ≥1440 After staying in the temperature section of ℃ for 10min, cool down to room temperature at a cooling rate of ≤20℃ / min. The surface morphology, section thickness, distribution of silicon and aluminum content of the infiltrated layer, and X-ray diffraction analysis results show that the surface of the obtained sample is compact and smooth, and the content of Si and Al on the surface of the gradient layer is 73% and 2.2% (mass), respectively. , the gr...

Embodiment 3

[0020] Example 3: get 475g of metal Si and 25g of No. 1 Al with purity >99.9%, put the above two metals in a corundum crucible, put the crucible into an argon-protected electric furnace and be heated to 1500° C., and keep the temperature constant for 3min; The pure molybdenum plate of 20mm×20mm×3mm suspended by platinum wire was put into the molten Si-Al alloy, and after hot infiltration at the temperature of 1440℃ for 35min, the treated molybdenum plate was taken out from the molten Si-Al alloy. After staying in the temperature section of the electric furnace with a furnace temperature of ≥1440°C for 10min, cool down to room temperature at a cooling rate of ≤20°C / min. The surface morphology, section thickness, distribution of silicon and aluminum content of the infiltrated layer, and X-ray diffraction analysis results show that the surface of the obtained sample is compact and smooth, and the content of Si and Al on the surface of the gradient layer is 85% and 4.3% (mass), res...

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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 put forward in 1984 by Japan's National Aeronautical Laboratory in order to adapt to the development of aerospace technology. By 1987, Japanese scholars Shinno Masatori, Hirai Toshio and Watanabe Ryuzo formed a brand-new concept of functionally graded materials, which soon attracted great interest and attention of scientists from all over the world, and was applied to nuclear energy, biomedicine, Machinery, petrochemical, information, civil and construction fields. The key feature of functionally graded materials is to control the continuous change of the composition and organization of the interface, so that two or several materials with different...

Claims

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Application Information

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Patent Type & Authority Patents(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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