THERMODYNAMIC APPROACH TO CHOICE OF ABRASIVE

GATQLZ

Abstract

Highly efficient technologies for restoring and strengthening worn machine parts include various methods of applying wear-resistant microporous nickel-based coatings. The high adhesive - chemical activity and low thermal conductivity of these coatings create difficulties when they are processed by grinding. These difficulties are caused by increased wear of the abrasive tool and intensive salting of its working surface, which leads to a decrease in processing performance and the quality of the polished surface (cauterization, faceting, cracks). The article expresses the authors' view on the problem of abrasive treatment of microporous coatings of restored parts. The possibilities of methods of physico-chemical analysis, as well as the possibility of using the method of equilibrium thermodynamics to study the grinding process of these coatings are considered. The validity of the thermodynamic approach is shown. The method of selecting abrasive materials based on computational thermodynamic methods is described. The authors admit that when processing metals with an abrasive tool, solid-phase processes of a chemical nature may occur. In this regard, the article provides the necessary conditions for the course of solid-phase reactions and, in particular, the reactivity of various abrasive materials and chemical compatibility. The use of established patterns will make it possible to identify ways to reduce the wear of abrasives by reducing the activity of their interaction with microporous coatings.