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

An iron-based powder metallurgy and engine valve technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of poor toughness of the valve seat blank body, poor long-term wear resistance, and low temperature denaturation, so as to improve the strength and friction properties, improving toughness, and reducing porosity

CN106623893AInactive Publication Date: 2017-05-10安徽马仪科技股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-05-10
Estimated Expiration
Not applicable · inactive patent
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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.
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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...

Examples

Embodiment Construction

[0016] A corrosion-resistant iron-based powder metallurgy self-lubricating CNG engine valve seat, made of the following raw materials in parts by weight: chromium 6.1, cobalt 4.1, nickel 0.9, manganese 2.1, magnesium 3.1, yttrium 0.4, copper 16, nanometer molybdenum disulfide 1.1, fluorinated graphite 0.8, metallurgical carbon black 0.5, aluminum oxide 2, sodium iodide 0.1, resole phenolic resin 1.7, aluminum silicate fiber 0.6, paraffin wax 1, iron 65.

[0017] A method for making a corrosion-resistant iron-based powder metallurgy self-lubricating CNG engine valve seat, comprising the following steps:

[0018] (1) Add nano-molybdenum disulfide to sodium iodide aqueous solution with a mass concentration of 5-15%, after ultrasonic dispersion is uniform, add paraffin and heat to 50-70°C, fully stir for 12-24 hours and spray dry;

[0019] (2) Put the copper powder into the crucible resistance furnace and heat it up rapidly until it is completely melted, then add the materials in ...