Wear Resistance Increase of Samples Tribomating in Oil Composite with Geo Modifier КGМF-1

Abstract

Increase of wear resistance of different types of tribomating which are functioning in fluid lubrication is possible due to: choosing more expensive and high quality material of samples that is not always sensible; applying some wear resistant coatings on them; selection and formation of complex composition of oil additives. Due to nanomaterials development there is a possibility of efficient use of functional additives such as geo modifiers in tribology. Due to geo modifier-based oil composites use it’s not necessary to make any structural changes of machines mated parts though their wear resistance is increased. It requires the conducting of some experimental tribological research. It was found that oil media modified by a geo modifier increase the wear resistance of working surfaces of different types of tribomating. The use of geo modifier КGМF-1 (Katerynivka friction geo modifier -1 (patent of Ukraine No69657)) has been suggested. Lubrication quality of oil compositions based on М-10Г2К (M-10G2K) (motor oil of 10th viscosity grade, of group Г2К (G2K), for the CIS countries the oil grade conforms SAE 30) + КGМF-1 (4.0 4.5%) has been studied on a computer modernized four-ball friction testing machine ЧШМ-К1 (CHMK-К1). To evaluate the lubrication quality of the oil composite with the suggested geo modifier and to use the comparative analysis of the obtained results the research was conducted on commercial samples of base oil M-10G2K and oil composites M-10G2K + XADO Maximum for Diesel Truck (2.0 2.3%) (agent 2D sliding revitalization factor (RF) 100, revitalizant 1 Stage RF 100, metal conditioner RF 5.5), M-10G2K + cuprum glycerate (3.7 4.5%). Some average indices of wear, critical load, and welding load have been found. Samples division into 4 types of mating according to the following characteristic features: mobility, material hardness and friction area has been suggested for more accurate picture of wear resistance changes of samples tribomating which are functioning in base and modified oil. Lower friction torque of different samples couplings in modified oil by geo modifier КGМF1 in comparison with base oil M-10G2K was recorded while using Friction machine 2070 SMT-1 with add-on module ring-ring . The samples wear rate in modified oil by geo modifier КGМF-1 in comparison with base oil M10G2K was studied by method of acoustic signal amplitude measurements directly from the friction zone by a commercially produced instrument of Brüel & Kjear company. Corresponding author: V. Aulin Central Ukrainian National Technical University, 8 Universytetskyi ave., 25006 Kropyvnytskyi, Ukraine. E-mail: [email protected] R E SE A R C H V. Aulin et al., Tribology in Industry Vol. 41, No. 2 (2019) 156-165 157 It was found that efficiency increase of the oil compositions under investigation is taking place in the following order: M-10G2K + XADO Maximum for Diesel Truck, M-10G2K + cuprum glycerate, M-10G2K + КGМF-1. Wear index due to the use of modified oil M-10G2K + КGМF-1 was 19 20 % lower comparing to the obtained data of the base oil, critical load value was 27 29 % larger, and welding load – 24 25% larger respectively. Moreover, it was recorded that the maximum wear rate of samples in their functioning in modified oil M-10G2K + КGМF-1 was 3 times lower, and friction torque change law is similar to the wear rate change depending on the time of testing. © 2019 Published by Faculty of Engineering