Study On The Effect Of Nano-Additives On Wear And Self-Repairing Performances Of GCr15/#45 Steel Pairs

Nowadays, with the rapid development of science and technology, the technological level of industrial manufacturing and processing industry has been improved. However, compared to the overall improvement in industrial sector, the serious damage due to mechanical friction and wear has restricted the overall level and requirement of economic development. Many vital problems have not been fundamentally solved, such as how to keep the machinery and equipment working for enduring and stable under more demanding conditions, how to improve the mechanical efficiency and traffic safety performance of vehicles, to reduce maintenance, repair and downtime losses, to save energy and reduce material loss, Although the lubricating materials and lubrication technology is continually updated. And nano materials have been applied to wear self-healing materials since eighties of the twentieth century, because of its exceptional performance in the lubrication and wear of self-healing.The friction and wear experiments were carried out using a PLINT Deltalab-NENE-7 horizontal electro-hydraulic tester. The Medium Duty Industrial closed Gear OilsL-CKC220 was used to lubricant oil. The nano-copper alloy (DNCu-1), nano-silicon nitride, nano-titanium carbide, nano-aluminum nitride and nano-silicon carbide were used to self-repairing additives. The self-repairing performance of different additives were been investigated in detail.The main conclusions are reached as follow.(1) Compared with the friction coefficient curve under the base oil. the friction behavior of dispersed oil solution have changed when adding nano materials. At early breaking-in stage, the change is due to different materials. Furthermore, the friction coefficient drops at later stable stage.(2) Compare the grinding spot morphology under the base oil. Only nano-silicon carbide dispersion had a serious grinding spot. The degree of wear of other additives were relieved. The grinding spots under oil soluble nano-copper alloy and nano-aluminum nitride dispersions even disappeared wear negative growth. Then we got the comparison of attrition and anti-wear function:oil soluble nano-copper alloy> nano-aluminum nitride> nano-silicon nitride> nano-titanium carbide> base oil> nano-silicon carbide.(3) Through analysis the EDX spectrum under the five dispersions, we can get the elements of four additive materials in the EDX spectrum apparently. By comparing the grinding spot and confirming that nano-aluminum nitride and oil soluble nano-copper alloy have good self-healing properties, we can obtain the comparison of self-healing: nano-aluminum nitride> oil soluble nano-copper alloy> nano-silicon nitride> nano-titanium carbide> nano-silicon carbide.(4) According to above, we got the overall attrition, anti-wear and self-healing function of the five nano-additives:oil soluble nano-copper alloy> nano-aluminum nitride> nano-silicon nitride> nano-titanium carbide>base oil> nano-silicon carbide.