Wear and friction studies on silicon nitride bearing balls using S-containing potential lubricant additives

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-bidi-theme-font:minor-bidi;="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Silicon nitride bearing balls of 12.7 mm diameter were used to evaluate the wear and friction reducing characteristics of admixtures of paraffin oil with 0.5% w/v solution of 1,5-di-<i style="mso-bidi-font-style:normal">p</i>-methoxyphenyl- 2,4-dithiomalonamide and 3,5-di-<i style="mso-bidi-font-style:normal">p</i>-chIorophenrlimino-1,2,4-dithiazolidine in a four ball test. Both the additives were found to be quite active in reducing wear-scar diameter and friction coefficient values and exhibited higher values of flash temperature parameter and load wear index. A comparative EP activity evaluation of both the additives using silicon nitride and alloy steel balls was undertaken to assess better applicability of silicon nitride balls in a four ball test.</span>