The effect of cryolite on grinding of stainless steel. (March 2020)

• Record Type: Journal Article
• Authors: Dellen, J.; Lynen, L.; Schwedt, A.; Mayer, J.; Telle, R.
• Is Part Of: Tribology international. Volume 143(2020)
• Publication Date: 2020-03
• Subjects: Coated abrasive -- dry grinding -- Built-up edge -- Active filler; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2019.106021
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: Active fillers play a major role in the dry grinding of stainless steel. However, the mechanism altering the process is still unknown. In this work, the efficiency of cryolite as filler was studied with a pin-on-disk tribometer. Simplified coated abrasives with and without active filler were used to reduce possible non-cryolite related interactions to a minimum. Diffusion experiments with stainless steel pins and cryolite were performed and the change in efficiency during abrasion investigated. The analysis of the pins revealed a Fex Cr1-x F2 phase. Tensile tests were performed of heat-treated specimens to investigate changes in brittleness. Finally, dissolution experiments were conducted, which proved a decrease in built-up edge volume in presence of cryolite, leading to a higher cutting efficiency. Highlights: Cryolite in the top-coat reduces grinding energy. Cryolite treated stainless steel pins are ground with less energy. Thermal reactions of stainless steel and cryolite lead to a brittle Fex Cr1-x F2 phase. Cryolite causes reduction of build-up edges.