Iron-based powder metallurgy self-lubricating CNG engine valve retainer with good heat-conducting property and manufacturing method thereof

Abstract

The invention discloses an iron-based powder metallurgy self-lubricating CNG engine valve retainer with a good heat-conducting property. The iron-based powder metallurgy self-lubricating CNG engine valve retainer is prepared from, by weight, 6.4-6.8 parts of chrome, 4.4-4.8 parts of cobalt, 1.1-1.5 parts of nickel, 3.4-3.8 parts of scandium, 2.1-2.4 parts of niobium, 4.3-4.7 parts of aluminum, 13-15 parts of copper, 1.2-1.5 parts of nanometer molybdenum disulfide, 0.2-0.3 part of sodium borate, 0.7-0.9 part of strontium sulfide, 1-3 parts of stainless steel powder, 0.1-0.3 part of potassium permanganate, 2-3 parts of bisphenol-A epoxy resin, 0.6-0.8 part of realgar powder and 60-64 parts of iron. The surface of the modified nanometer molybdenum disulfide is covered with a layer of copper film used as a solid lubricating agent, meanwhile, strontium sulfide, scandium, niobium, aluminum and other ingredients are added, the product prepared through sintering, infiltration and heat treatment technologies is high in strength, good in heat-conducting property and excellent in wear resistance, and the working condition requirements of a natural gas fuel engine can be met.

Description

Technical field [0001] The invention relates to the technical field of automobile engine parts, in particular to an iron-based powder metallurgy self-lubricating CNG engine valve seat ring with good thermal conductivity 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 rationally use energy. my country is rich in natural gas resources, and its market prospects are huge as a clean fuel for engines. However, with the use of new energy sources, the operating conditions of automobile parts, especially engine valve seats, will change, and new requirements for their materials will also be put forward. The intake and exhaust valve seats of CNG engines are important working parts for controlling gas intake and exhaust gas discharge. They are subjected to air erosion and high-frequency impact fricti...

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.