Production method of nanocomposite surface piston ring

Abstract

The invention discloses a production method of a nanocomposite surface piston ring. The method comprises the following steps: performing degreasing to a piston ring blank made of cast iron substrate before planting, cleaning the surface of the blank, performing sand blasting to the blank, adding the piston blank into electroplate liquid I to be subjected to reverse etching, adding the blank subjected to reverse etching into electroplate liquid II to be subjected to electrolytic deposition till the thickness of nano-coating formed on the outside circle surface of the blank is 0.06 to 0.12mm, and adding a semi-finished piston ring into a grinding cylinder to grind the semi-finished piston ring till the thickness of the nano-coating is 0.04 to 0.10mm to form a finished piston ring. According to the method, a nano wild phase with high wearing resistance, corrosion resistance, good tenacity and self-lubrication to replace micron-sized traditional solid particles to modify the surface of the piston ring, an electric pulse technology is adopted to realize the nanocrystallization of Ni-P crystal grain on the surface of the piston ring, and nano-coating with the nano-phase embedded uniformly further improves the tenacity and the wearing resistance of the surface of the piston ring.

Description

[0001] technical field [0002] The invention relates to the field of piston rings, in particular to a production method of a nanocomposite surface piston ring. Background technique [0003] At present, the competitive high-end piston ring products in the market are products using technologies such as thermal spraying, ion implantation, physical vapor deposition, and chemical vapor deposition. Thermal spraying is the first dry chromium replacement technology approved by the US Department of Defense so far. The advantage of this method is that it can deposit various materials and get thick coatings. The deposition speed is faster than chrome plating, but the cost is high and the spraying noise Large, and can only be deposited on a small area, not suitable for large and complex parts, the plating layer is stressed and rough. Ion implantation modification can be harder and more wear-resistant than the chromium layer; physical vapor deposition and chemical vapor deposition have...

AI Technical Summary

Problems solved by technology

Thermal spraying is the first dry chromium replacement technology approved by the US Department of Defense so far. The advantage of this method is that it can deposit various materials and get thick coatings. The deposition speed is faster than chrome plating, but the cost is high and the spraying noise Large and can only be deposited on small areas, not suitable for large and complex parts, the plating layer is stressed and rough

Ion implantation modification can be harder and more wear-resistant than the chromium layer; physical vapor deposition and chemical vapor deposition have the characteristics of hard film, wear-resistant, porous, etc. These technologies are also complicated in process and high in cost

The piston rings developed by the composite coating technology developed in recent years, the solid particles in the wear-resistant composite coating are generally ceramic particles, and their particle sizes are all in the micron order. The wear resistance is excellent, but the wear reduction and corrosion resistance are not ideal. In particular, it is difficult to balance the hardness and toughness of the coating; increasing the hardness is often at the expense of toughness, resulting in increased brittleness, resulting in poor matching and bonding between the coating and the substrate, the coating is easy to crack, and the hard phase is easy to fall off