A novel high heat-resistant turbocharger sealing ring and its preparation method

Abstract

The invention relates to a novel high heat resistant turbocharger sealing ring, which comprises the following chemical components by mass: less than or equal to 0.8% of C, less than or equal to 0.35% of Mn, less than or equal to 0.35% of Si, 17.0-21.0% of Cr, less than or equal to 1.0% of Co, 0.2-0.8% of Al, 0.65-1.15% of Ti, 2.8-3.3% of Mo, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 0.3% of Cu, 50.0-55.0% of Ni, 0.002-0.006% of B, 4.75-5.5% of Nb+Ta, and the balance Fe. The sealing ring involved in the invention is heat resistant, wear resistant and corrosion resistant, has good thermal stability, can maintain reliable elasticity and hardness under high temperature, and has a free opening disappearance rate of less than 80% and no light transmission phenomenon, thus being suitable for gasoline engine turbochargers at high temperature and high rotational speed.

Description

technical field [0001] The invention relates to the technical field of supercharger sealing rings, in particular to a novel high heat-resistant turbocharger sealing ring and a preparation method thereof. Background technique [0002] The sealing ring is one of the important parts of the turbocharger. Because it works in high temperature and engine exhaust for a long time, and needs to work continuously at high speed, it is easy to lose elasticity, and the sealing ring will lose its sealing effect after being corroded or excessively worn. , which in turn causes oil leakage and air leakage from the supercharger, resulting in unstable operation of the supercharger, which directly affects the working performance of the internal combustion engine; therefore, the material of the sealing ring directly affects its performance, because the working environment requires that the material must be heat-resistant, resistant Grinding and corrosion resistance, good thermal stability. Howev...

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Problems solved by technology

[0002] The sealing ring is one of the important parts of the turbocharger. Because it works in high temperature and engine exhaust for a long time, and needs to work continuously at high speed, it is easy to lose elasticity, and the sealing ring will lose its sealing effect after being corroded or excessively worn. , which in turn causes oil leakage and air leakage from the supercharger, resulting in unstable operation of the supercharger, which directly affects the working performance of the internal combustion engine; therefore, the material of the sealing ring directly affects its performance, because the working environment requires that the material must be heat-resistant, resistant Wear and corrosion resistance, good thermal stability

However, the sealing rings on the existing market mainly include 3Cr13 stainless steel sealing rings, chrome-molybdenum sealing rings and tungsten-molybdenum sealing rings. Among them, the heat-resistant temperature of 3Cr13 stainless steel sealing rings is 400°C, the heat-resistant temperature of chromium-molybdenum sealing rings is 450°C, and the heat-resistant temperature of tungsten-molybdenum sealing rings is 400°C. The heat-resistant temperature of the sealing ring is 500°C. Due to the low heat-resistant temperature, it can only be used for turbochargers of diesel internal combustion engines, but not for high-temperature and high-speed gasoline engine turbochargers.

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