Iron-chromium-boron-silicon/FeS composite solid lubrication thin film and method for making same

Abstract

The invention discloses an Fe-Cr-B-Si / FeS composite solid lubricating film and a preparation method thereof, which firstly uses ultrasonic plasma for spray painting an Fe-Cr-B-Si coating on a substrate and then low temperature ion sulfurizing treatment is carried out to the Fe-Cr-B-Si coating and the Fe-Cr-B-Si / FeS composite solid lubricating film is prepared. The Fe-Cr-B-Si / FeS composite solid lubricating film is characterized in that: the Fe-Cr-B-Si coating is firstly painted and then the sulfurizing treatment is carried out to the coating so that the surface layer of the coating reacts with sulfurous steam to form an FeS layer, and finally, the upper part of the Fe-Cr-B-Si coating turns out to be an FeS solid lubricating layer. The invention has a novel structure and no obvious boundary exists on the FeS layer of the Fe-Cr-B-Si coating and the FeS layer has good binding capacity with the substrate. Compared with the prior art, the invention has good nano mechanical properties with an anti-friction capacity better than the prior art by more than 20 times. As the invention is the FeS layer obtained from sulfurizing on the surface of the Fe-Cr-B-Si coating, thus having a compact structure; besides, the friction property of the Fe-Cr-B-Si / FeS composite solid lubricating film is stable and the anti-friction property thereof is much better under the conditions of either dry friction or oiling.

Description

technical field [0001] The invention relates to a solid lubricating film, in particular to an iron chromium borosilicate / FeS composite solid lubricating film and a preparation method thereof. Background technique [0002] At present, in order to reduce the friction coefficient of the surface of the workpiece, enhance the anti-friction and anti-seizure ability, and make it have excellent anti-friction and anti-friction performance, those skilled in the art generally carry out vulcanization treatment on the metal surface, that is, vulcanization, to form a vulcanization on the surface. sulfur layer. However, sulfurizing directly on the metal surface will reduce the hardness and elastic modulus of the metal, and the anti-friction effect is not good. In order to increase the wear resistance of the material and prolong the service life of the friction pair, it is very necessary to increase the hardness and strength of the material, but this is not always effective in many occasio...

AI Technical Summary

Problems solved by technology

The disadvantage is that the surface energy of FeS particles is low, and the wettability with the substrate is poor, so the bonding strength between the coating and the substrate is low.

When the FeS content is too low or too high, the performance is poor, and the appropriate FeS content is difficult to grasp

[0005] Also have prior art to prepare FeS film is to directly carry out low-temperature sulfurizing treatment on the surface such as 45# steel, the nano-mechanical property of made FeS film comprises nano-hardness and modulus of elasticity all low, causes the wear resistance of FeS film to be relatively low. Therefore, the nanohardness and anti-wear ability of FeS solid lubricant film need to be improved

[0006] At present, in order to solve the defects of existing solid lubricating coatings, researchers in this field have proposed a composite coating, that is, spraying another coating on the basis of a single coating to form a composite coating. Compared with the single coating, although the nano-mechanical properties such as hardness are improved, its ability to combine with the metal matrix is ​​not very ideal, and the anti-wear effect is not very good.

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