Физико-механические свойства ZrN-Ni-Co-покрытий на лезвиях стальных ножей дереворежущего инструмента

Abstract

The article deals with the investigations of the structure, element composition as well as mechanical and tribological properties of ZrN-Ni-Co-coatings formed on the edges of steel (kind R6M5) knives of wood-cutting tools. Ni-Co-coatings are synthesized from sulfate electrolyte on the steel surface. Modes were selected and ZrN-coating, combined ZrN-Ni-Co-coating are formed by PVD method, by electroplating and PVD methods. Formed electroplated Ni-Co-layers are not mixed with the steel substrate and the ZrN-coating. The microhardness value of combined ZrN-Ni-Co-coatings is 1.2-1.5 times more than that of the steel base and bare steel. When cutting laminated chipboard by steel knives of milling tool with Ni-Co- and ZrN-Ni-Co-coatings under laboratory conditions, abrasive surface wear type of edges is observed. The wear intensity of the edges of knives with deposited coatings is reduced. The value of calculatedbulk wear of the edges of knives with ZrN-Ni-Co-coatings had more than 3 times less value in comparison with the knives with Ni-Co-coatings. Pilot testing of the tool modified with combined ZrN-Ni-Co-coatings at JSC "Minskdrev" when cutting pine confirmed relevance of the tests carried out, as well as showed an increase in durability period of cutters up to 30% compered with the bare tool.