Preparation method of corrosion resistant FeAl intermetallic compound-based composite structure coating
An intermetallic compound and composite structure technology, which is applied in the fields of machinery, electricity, material processing, chemical industry, and metallurgy, can solve the problem that the performance of intermetallic compound materials cannot be fully utilized, and it is difficult to achieve effective preparation of intermetallic compound coatings and coating bonding strength. , unfavorable service life and other problems, to avoid penetrating pores, enhance strain coordination ability, and superior wear resistance.
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Embodiment 1
[0029] FeAl-Al 2 o 3 As an example, mix Fe and Al according to the atomic ratio of 1:1, then add ceramic particles with a volume fraction of 30% and a particle size of 2.5 μm, and ball mill for 25 hours. The cross-sectional structure of the obtained powder is as follows: figure 1 As shown, Fe and Al form a lamellar distribution and are distributed with ceramic particles. Prepare an alloy composite structure coating with a thickness of 0.5 mm on the surface of the sinking roller by cold spraying, and heat-treat the coating for 8 hours under Ar gas protection and 600 ° C to convert it into FeAl-Al 2 o 3Composite structural coatings. The oxygen content in the controlled atmosphere is about 20000Pa, and it is kept at 1050oC for 16 hours to form a layer of uniform, dense and continuous α-Al on the surface 2 o 3 Thin films, cross-sectional structures such as figure 2 shown.
Embodiment 2
[0031] FeAl-Al 2 o 3 -MoB as an example, Fe and Al are mixed according to the atomic ratio of 60:40 and 25% of Al with a particle size of 1 μm is added 2 o 3 Ceramic particles and 10% MoB ceramic particles with a particle size of 0.5 μm were ball milled for 5 hours. Prepare an alloy composite structural coating with a thickness of 0.3 mm on the surface of the sinking roller by cold spraying, and heat the coating for 2 hours at 1000 ° C to convert it into FeAl-Al 2 o 3 - MoB composite structural coating. During heat treatment, the two elements of FeAl diffused after heat treatment to form a uniform matrix phase of FeAl intermetallic compound. Control the oxygen content of the atmosphere under high temperature conditions to not exceed 5%, and the coating surface can form uniform and dense α-Al at 950oC 2 o 3 film. Under this condition, although there may be some non-α-type Al in the outermost layer of the oxide film 2 o 3 , such as needle-like or flake-like θ-Al 2 o ...
Embodiment 3
[0033] On the basis of Example 1, good results can also be obtained by substituting part or all of Fe with Ni. Generally speaking, the cost of Ni is higher than that of Fe, so Fe is the preferred element from the perspective of cost reduction. However, replacing part of Fe with Ni, or adding some other elements (various elements of the matrix alloy of the sinking roll) alone or at the same time, can alleviate or even avoid excessive diffusion of matrix alloy elements into the coating, which is beneficial to the reuse of the roll body. Based on the substantive technical solution of the present invention, comprehensive consideration of the above technical problems will help to enhance the actual implementation effect of the present invention and reduce the comprehensive cost.
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