PLASMA-ION METHODS OF CHANGING OPERATIONAL PROPERTIES OF SURFACE LAYERS OF THE MACHINED PARTS

Abstract

Problem. Improvement of production is difficult without the use of new progressive technological processes that can increase the resource and reliability, ensure the performance of parts and components in the most difficult operating conditions, at high temperatures and in aggressive environments, the effects of dynamic and contact loads. Goal. The purpose of the work is to study the restoration of the surface layer of the "shaft" type parts of automobile engines and other aggregates by the Plasma Immersion Ion Implantation and Deposition - PIII & D method. Methodology. The system under consideration refers to planar magnetron systems with the structure of a hollow cathode. The technological process involved the following operations: ion purification in a glow discharge in an argon medium when contaminated surface layers are removed; purification and heating in magnetron discharge in argon medium; cementation in a magnetron discharge in a medium of methane when the surface is saturated with carbon and the main heating of the substrate is carried out (additional heating is carried out, if necessary, by a resistive heater). Results. According to the results of the measurement of mica-hardness, for ion-implanted layers it is possible to achieve a hardness of about HV0.1 = 380, which means that the hardness of the coagulated surface can be increased by 1.8 times. Originality. The construction of the considered cathode allowed the magnetic field lines to come close to the surface where negative displacement potential was applied to the grounded walls of the vacuum chamber. This was necessary to ensure the initiation of a glow discharge by creating a configuration of a magnetic system with closed drift of electrons.