TRIBOLOGICAL PROPERTIES OF ASBESTOS-FREE FRICTION BRAKE MATERIALS OF BASTENIT – TYPE, AND RECOMMENDATIONS FOR THEIR APPLICATION

Abstract

The results of analysis of tribological properties of asbestos-free friction brake materials of  Bastenit - type are presented and recommendations for their use are developed. The development of new asbestos-free friction brake materials was carried out using two methods: a) regulation of the ongoing mechanochemical and structural changes, their displacement to the region of higher temperatures, b) control of the stress-strain state of the surface layer based on preliminary prediction and assessment of the energy intensity of wear.

Bastenit materials allow: to stabilize the tribological characteristics of the friction pair at surface temperatures of 500…600 ⁰С, to eliminate the surface defects of the contacting parts and thermal cracks of the counterbody, to reduce the wear of the counterbody by 1,6 times and the friction lining by 1,8 times in the presence of moisture in the friction contact, to increase the friction coefficient by 1,5 times at 400…600 ⁰С, to protect the friction surface of the counterbody from corrosion and hydrogen wear, to stabilize the friction coefficient at 400…600 ⁰С. With the use of marble powder and fayalite contained in the slags of the Alaverdi copper smelter in the composite compositions of Bastenit materials, the destructive processes of glass, basalt and graphite fibers occur at higher temperatures and, as a result, the tribological properties of the composites are stabilized. The specific areas of application of Bastenit type asbestos-free friction brake materials are given.