A kind of method that prepares fe-al intermetallic compound coating on low carbon steel substrate
An intermetallic compound, low carbon steel technology, applied in metal material coating process, coating and other directions, can solve the problems of large composition deviation, large cracking tendency of iron-aluminum intermetallic compound coating, aluminum powder burning, etc. High hardness effect
Active Publication Date: 2015-11-04
SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
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Problems solved by technology
Although there are many research reports, the prepared iron-aluminum intermetallic compound coating has a large tendency to crack. When aluminum powder is used as the reaction raw material, the aluminum powder has serious burning loss during the reaction process, and the final composition deviation is relatively large. Big
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0010] Embodiment 1: 10% of rutile, 5% of calcium fluoride, 1% of chromium powder, 3% of silicon powder, 26% of aluminum powder, and 55% of iron powder. After ball milling and mixing, it is cold-pressed into a sheet with a thickness of 1 mm, placed on the surface of low-carbon steel, and clad with argon arc at a current of 90A. Finally, the coating is a FeAl intermetallic compound with a B2 structure, and the surface microhardness is 500HV. The oxidation resistance is 20 times that of low carbon steel.
Embodiment 2
[0011] Embodiment 2: 8% rutile, 6% calcium fluoride, 2% chromium powder, 5% silicon powder, 11% aluminum powder, and 68% iron powder. After ball milling and mixing, it is laid on the surface of low-carbon steel in the form of pre-set powder. Water glass is used as a binder with a thickness of 1.5 mm. The coating of the mixture of B2 structure FeAl and a small amount of DO3 structure Fe3Al has a surface microhardness of 580HV, and the corrosion rate in 5% sulfuric acid solution is one eighth of that of low carbon steel.
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Abstract
The invention discloses a method for preparing an Fe-Al intermetallic compound coat on a low-carbon steel substrate. Reactants comprise pure iron powder and aluminum powder as main reactants, and a small amount of rutile or titanium dioxide, calcium fluoride, chromium powder and Si powder. The method comprises the following steps: uniformly mixing above powders in a ball mill, preparing a film through a cold pressing process or directly uniformly spreading the above obtained milled powder mixture on a low-carbon steel plate, fixing, and cladding through electrode arc ignition. The reactants concretely comprise, by mass, 11-26 parts of the aluminum powder, 55-68 parts of the iron powder, 8-10 parts of rutile, 5-6 parts of calcium fluoride, 1-2 parts of the chromium powder and 3-5 parts of the Si powder. The coat obtained in the invention has the advantages of high hardness, corrosion resistance and oxidation resistance, and can be used for the corrosion resistance and oxidative protection resistance of relevant situations, such as the flue protection of a power plant.
Description
technical field [0001] The invention relates to a method for preparing a Fe-Al intermetallic compound coating on a low-carbon steel substrate. Background technique [0002] Fe-Al intermetallic compounds have low density, high specific strength, excellent high-temperature oxidation resistance, sulfidation corrosion resistance and wear resistance, and do not contain rare and precious elements, low cost, and play an important role in the field of aerospace materials and high-temperature structural materials. Applications. If the Fe-Al intermetallic compound coating can be prepared on the surface of the steel base, the high-temperature oxidation resistance and sulfide corrosion resistance of the base material can be improved. The current methods for preparing Fe-Al intermetallic compound coatings include thermal spraying, surfacing, and cladding. Although there are many research reports, the prepared iron-aluminum intermetallic compound coating has a greater tendency to crack....
Claims
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IPC IPC(8): C23C24/10B22F1/00
Inventor 王龙林高永芬翟慎会栾涛邹勇
Owner SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP