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

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...

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.