Friction Mechanism Features of the Nickel-Based Composite Antifriction Materials at High Temperatures

Abstract

The friction behavior of the formed antifriction films and their effect on the functional properties of the composite based on the powder nickel alloy EI929 with solid lubricant CaF2 at high temperatures was investigated. An antifriction film was formed on the contact surfaces during the friction process. Such a film was the result of the interaction of the contact surfaces with atmospheric oxygen at high temperatures. It contains oxides of alloying elements from materials of the frictional contact and solid lubricant calcium fluoride. The quantitative ratio of formed oxides depends on the temperature operating conditions of material. The data of thermodynamic simulation of the high-temperature interaction of the composite with oxygen coincide with the experimental data obtained by studying the fine structure of surface antifriction films. Antifriction films consist of oxide phases in combination with solid CaF2 lubricant. Anti-friction films provide high wear resistance of the self-lubricating composite in the range of temperatures 1073–1173 K due to the balance between the rate of their formation and wear. When the temperature exceeds 1200 K, the film loses its lubricating properties and acts as an abrasive substance due to the intense oxidation. Abrasive surfaces of materials were subjected also to microscopic examination, in which the mechanically mixed layer (MML) was described. The study of the friction surface roughness parameters confirmed the presence of the formed friction self-lubricating film and allowed to determine its parameters. The friction mechanism was the formation of an oxide layer combined with a solid lubricant, which provides high antifriction properties in the range of 1073–1273 K.

Structure and Properties of New Antifriction Composites Based on Tool Steel Grinding Waste

“…The use of a certain substance is determined by the material of the contact surfaces, friction conditions, mechanical and chemical properties of substances, their thermal stability in relation to the environment, and interaction with the materials of the friction pair. Currently, more than 100 substances were investigated and described [6,7,[12][13][14][15][16], and they are used as solid lubricants.…”

“…Therefore, certain antifriction additives are used when they give the greatest effect precisely for certain specific conditions. Meanwhile, the experience of work [12][13][14][15][16] and the analysis of literary sources on this issue convincingly showed the promise of using calcium fluoride as a solid lubricant specifically for extreme operating conditions (high temperatures, loads, aggressive environment-air).…”

The Effect of Y on the Microstructure, Mechanical and Wear Properties of ZCuSn10Pb10 Alloy

“…At the same time, lead-tin bronze has good wear resistance, high strength and elongation [ 3 , 4 , 5 , 6 ]. The wear resistance of the alloys is closely related to the inherent properties, such as strength, hardness, load, speed and lubrication [ 7 , 8 ]. Temperature will also affect the friction and wear properties through its effects on the thickness and composition of the deformed layer beneath the wear track or the contact surface properties [ 9 ].…”

Development of Technology for Manufacturing Efficient Composite Bearing Materials for High-Speed Printing Machines

“…Large assortment of the cast and powder antifriction materials based on cast iron, copper and nickel are developed and applied for the listed too heavy working conditions 3,4,5 . Intensive wear and high friction coefficient of cast parts have been connected with imperfection of manufacturing technologies.…”