SLIDING MEMBER, METHOD FOR PRODUCING THE SAME, AND APPARATUS FOR PRODUCING THE SAME

• Main Authors: NAKAMURA KEIGO, SHINAGAWA KAZUYA, HATO HISAMITSU
• Format: Patent
• Language: English; Japanese
• Published: 30.08.2022
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

To provide a sliding member that protects an area near the surface from internal damage, surface damage and softening damage and has an outermost surface uniformly formed with low friction and high durability against high bearing stress.SOLUTION: A sliding member has a surface layer formed on the outer surface region of a base material. The surface layer comprises a nitrided layer that contains iron nitride having a nitrogen concentration of 5.9% to 11.1% on a mass basis, and also comprises a cured layer that is positioned closer to the base material than the nitrided layer. The nitrided layer constitutes the outermost surface; and the nitrogen content is uniform at least in the outermost surface.SELECTED DRAWING: Figure 1 【課題】表面近傍における内部損傷、表面損傷及び軟化損傷を抑制する構成を有し、低摩擦で、かつ、高面圧に対する耐久性が高い最外表面が一様に形成された摺動部材を提供する。【解決手段】母材の外面領域に表面層を形成した構成を有する摺動部材であって、表面層は、窒素濃度が質量基準で５．９～１１．１％の窒化鉄を含む窒化層を含み、かつ、窒化層よりも母材側に位置する硬化層を含み、窒化層は、最外表面を構成し、少なくとも最外表面における窒素の含有量が一様である。【選択図】図１