Wear and friction studies of some substituted benzothiazolyl thiocarbamides as potential EP 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:arial;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">Four-ball tests using 12.7 mm diameter steel bearing balls have been conducted to evaluate the wear and friction reducing properties of admixtures of paraffin oil with potentially active 1-[2-(6- substituted) benzothiazolyl]-thiocarbamides and sulphurphosphorous commercial additive (0.5<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-theme-font:minor-latin;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">% <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:arial;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">wt/vol). The parameters determined are wear-scar diameter, friction coefficient, initial seizure load, 2.5 s seizure delay load, weld load, mean Hertz load and flash temperature parameter, The additive, 1-[2-(6-Chloro) benzothiazolyl] thiocarbamide appeared to be the most effective. The topography and tribochemistry of the wear-scar surface have been studied by SEM and AES techniques, respectively.</span></span></span>