Embedded powder metallurgy valve seat ring material

Abstract

The invention discloses an embedded powder metallurgy valve seat ring material which comprises a support body and a compact layer in contact with a valve. The support body comprises the following element raw materials in percentage by mass: 0.4 to 1.4 percent of C, 15.0 to 38.0 percent of Cu, 0.1 to 1.5 percent of S, 0.2 to 2.0 percent of Mn, 0.2 to 2.0 percent of Cr, 0.2 to 2.0 percent of Mo, 0.2to 2.0 percent of W, 0.1 to 1.5 percent of V and the balance of Fe. The compact layer comprises the following element raw materials in percentage by mass: 0.2 to 1.4 percent of C, 2.0 to 10.0 percentof Cr, 10.0 to 22.0 percent of Mo, 1.0 to 6.0 percent of W, 0.3 to 2.0 percent of V, 0.5 to 2.0 percent of Ni, less than or equal to 1.2 percent of Mn, 0.5 to 3.0 percent of Si, 15.0 to 35.0 percentof Co and the balance of Fe. According to the embedded powder metallurgy valve seat ring material provided by the invention, the compact layer is formed on the part, making contact with the valve, ofthe support body, so that the requirement for the abrasion resistance of the support body is low, and only the requirements on high temperature resistance and the heat conduction performance need to be met; and by limiting the formula of the compact layer, Cr, Mo, Ni and Co are added to enable the compact layer to meet the requirement for abrasion resistance, and the compact layer does not need touse the element Cu, so that the use of the Cu is reduced.

Description

technical field [0001] The invention relates to the technical field of engine valve seat rings, in particular to an inlaid powder metallurgy valve seat ring material. Background technique [0002] The valve seat is one of the core parts of the engine valve train. It cooperates with the valve to seal the combustion chamber. To withstand the frequent impact of the valve on it under high temperature and high stress, it needs to have good wear resistance and heat resistance to prevent excessive The sealing is not tight caused by wear; with the application of technologies such as turbocharging, lean combustion, and direct injection in the cylinder, as well as the application of clean fuels such as natural gas, methanol, and ethanol, the ambient temperature and load on the valve seat ring are becoming more and more severe. High, lubrication conditions are getting worse. [0003] In order to improve the wear resistance and high temperature resistance of the existing powder metallu...

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Problems solved by technology

[0003] In order to improve the wear resistance and high temperature resistance of the existing powder metallurgy valve seat technology, the method is to add various high temperature and wear resistant alloy elements such as Co, Cr, Mo, Ni, W, V, etc., and a high proportion of alloy addition Although it can significantly improve the high temperature resistance and wear resistance, but when the alloy ratio reaches a certain level, it also brings problems such as insufficient sintering diffusion, low strength, and difficulty in forming and pressing. Therefore, in order to meet the high performance requirements of the valve seat ring, a A New Type of Valve Seat Material

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