LONG-ACTING ANTIBACTERIAL SOLID LUBRICATING FILM LAYER FOR SPACE ENVIRONMENT AND PREPARATION METHOD THEREFOR

摘要

A long-acting antibacterial solid lubricating film layer for a space environment and a preparation method therefor. The solid lubricating film layer comprises: a substrate, an Ag-containing diffusion layer, and a coating; the coating comprises: a Cr seed layer and an Ag-containing amorphous carbon film layer successively deposited on the substrate; the Ag-containing diffusion layer is located in the substrate adjacent to the Cr seed layer, and is formed from a matrix material and Ag atoms diffused and doped from the Cr seed layer into the matrix material. The Cr seed layer is deposited on the substrate, and then a magnetron co-sputtering graphite target and an Ag target are used to deposit a gradient transition Ag functional layer by means of adjusting and controlling the magnitude of a sputtering Ag current. Finally, heat treatment is performed to promote the diffusion of the Ag atoms in the coating to the substrate, thereby achieving an increase in the thickness of the Ag-containing antibacterial functional layer. After a long-term friction experiment, the obtained coating does not decrease in antibacterial level and achieves a long-acting antibacterial effect. The present invention is particularly suitable for a long-acting antibacterial lubrication component of a space station, and has large practical application requirements and good application prospects.