Anti-corrosion iron-based powder metallurgy self-lubricating CNG engine valve seat ring and making method thereof

Abstract

The invention discloses an anti-corrosion iron-based powder metallurgy self-lubricating CNG engine valve seat ring. The anti-corrosion iron-based powder metallurgy self-lubricating CNG engine valve seat ring is made from, by weight, 6.1-6.4 parts of chromium, 4.1-4.3 parts of cobalt, 0.9-1.1 parts of nickel, 2.1-2.4 parts of manganese, 3.1-3.4 parts of magnesium, 0.4-0.6 part of yttrium, 16-17 parts of copper, 1.1-1.2 parts of nano-molybdenum disulfide, 0.8-1.1 parts of graphite fluoride, 0.5-0.7 part of metallurgical carbon black, 2-3 parts of aluminum oxide, 0.1-0.2 part of sodium iodide, 1.7-2.1 parts of resol phenolic resin, 0.6-0.8 part of aluminum silicate fibers, 1-2 parts of paraffin and 65-67 parts of iron. According to the valve seat ring, the surface of modified nano-molybdenum disulfide is covered with a layer of copper film to be added into a substrate material by serving as a solid lubricating agent, the components such as aluminum oxide, manganese, magnesium and yttrium are also added, the metal particle phase is changed through the processes of sintering, infiltration and heat treatment, and the made product has the excellent corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of automobile engine accessories, in particular to a corrosion-resistant iron-based powder metallurgy self-lubricating CNG engine valve seat and a manufacturing method thereof. Background technique [0002] Compressed natural gas (CNG), liquefied petroleum gas (LPG) and methanol as alternative fuels for internal combustion engines are effective ways to protect the environment and use energy rationally. my country is rich in natural gas resources, and its market prospect as a clean fuel for engines is huge. However, with the use of new energy sources, the operating conditions of auto parts, especially engine valve seat rings, will change, and new requirements are put forward for their materials. The intake and exhaust valve seat rings of CNG engines are important working parts to control gas intake and exhaust gas discharge. Under high temperature, they are subjected to the erosion of air flow and high-frequ...

AI Technical Summary

Problems solved by technology

[0004] Because the valve seat ring has no oil lubrication in the working process, its weather resistance is poor, its service life is short, and its long-term wear resistance is poor. At present, there are few researches on the combination of adding hard particles, self-lubricating additives, etc. and adopting a new infiltration process.

In the literature, only the new process of infiltration is adopted, and the method is relatively single, and the obtained valve seat green body has poor toughness, poor cutting performance, low temperature resistance and short service life, etc.