Thermal oxidization resistant engine cylinder inner wall abrasion resistant coating and preparation method thereof

Abstract

The invention discloses a thermal oxidization resistant engine cylinder inner wall abrasion resistant coating which is prepared from the following raw materials in parts by weight: 68-69 parts of 316 stainless steel powder, 6-6.5 parts of Mo powder, 25-26 parts of Ni60 powder, 5.8-6 parts of WC, 5.6-5.8 parts of B4C, 0.3-0.4 part of nano graphene, 2.5-2.8 parts of tetrabutyl titanate, 8.5-10 parts of sodium molybdate, 4.5-4.8 parts of acetic anhydride, 75-80 parts of dimethylformamide, a proper amount of concentrated hydrochloric acid and 10-12 parts of tetrabutylammonium bromide. According to the thermal oxidization resistant engine cylinder inner wall abrasion resistant coating, through utilizing sodium molybdate, nano molybdenum particles are formed on the surface of the metal powder, and nano molybdenum dioxide is adhered to the surface, so that the lubrication performance of the coating is improved, and the bonding strength of the coating is improved; and through utilizing WC, B4C, nano graphene and tetrabutyl titanate, the thermal oxidization resistance of the coating is improved, the friction coefficient is reduced, the bonding strength of the coating and a substrate is high, and the fracture and falling-off phenomena are reduced.

Description

technical field [0001] The invention relates to the technical field of coatings on the inner walls of automobile cylinders, in particular to a wear-resistant coating on the inner walls of thermal oxidation-resistant engine cylinders and a preparation method thereof. Background technique [0002] Energy saving and emission reduction has become the ultimate goal of global auto companies. According to data, in the emission of air pollutants, CO accounts for 66%, NOx accounts for 43%, HC accounts for 31%, CO 2 33% of air pollution and 20% of particulate matter come from vehicle emissions. The lightweight of automobiles is very important to save energy and reduce exhaust emissions. The use of aluminum alloy engines to gradually replace traditional cast iron engines is one of the main ways to save energy and reduce emissions. However, because the strength and stiffness of aluminum alloy are lower than those of cast iron, a common method is to inlay cast iron bushings on the inn...

AI Technical Summary

Problems solved by technology

[0003] However, with the advancement of science and technology, people's requirements for environmental protection and automobile performance are getting higher and higher. The coating's corrosion resistance, wear resistance, lubricity, crack resistance, hardness, thermal shock resistance, Thermal oxidation resistance and heat resistance still cannot meet the requirements and need to be further improved