STRUCTURE AND TRIBOTECHNICAL PROPERTIES OF COMPOSITE ANTIFRICTION MATERIALS BASED ON R7M2F6 STEEL WASTE

Abstract

Background. Development of the technological measures for creating new antifriction composite materials based on waste powders of steel P7M2F6 with solid lubricant CaF2, intended for operation at temperatures up to 600 °C, sliding speeds up to 1 m/s, loads up to 5.0 MPa in air.Objective. The purpose of the paper is to determine the features of structure formation and their influence on the properties of composite antifriction materials based on industrial grinding waste of steel P7M2F6 with solid lubricant CaF2 for operation at high temperature friction units in air.Methods. Methodology consisted of the development of the regeneration technological modes of the industrial grinding waste of steel P7M2F6, determination of technological manufacturing operations for new antifriction composites that include mixing of steel powders with solid lubricant, pressing and sintering of composites. The study of the structure formation processes and properties of materials was carried out using optical and electron microscopy methods, standard methods for determining mechanical properties and tests for friction and wear.Results. The influence of the developed manufacturing technology on the formation of the structure, physical mechanical and tribotechnical properties of materials based on steel P7M2F6 grinding waste with solid lubricant CaF2 additives was determined and grounded; resulting is the formation of complex heterogeneous antifriction material with high functional characteristics. The new material’s structure formation and its influence on the functional properties after using the developed manufacture modes was shown. Micro-X-ray spectral analysis confirmed the fact that CaF2, the contact pair’s chemical elements and oxygen form an antifriction film that provides a self-lubrication mode at the determined friction temperatures.Conclusions. The possibility of predicting the structure and functional properties of antifriction self-lubricating composite materials at high temperatures by purposeful choice of starting metal grinding wastes for certain operation conditions of contact pair was shown.