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Rare earth-containing powder metallurgy natural gas engine valve seat ring

A technology of engine valves and powder metallurgy, which is applied in the direction of engine components, turbines, other manufacturing equipment/tools, etc., can solve the problem of high temperature dry wear and cavitation damage of valve seat rings, the density and strength of nickel-based and iron-based valve seat rings Problems such as subsidence and interference are not ideal, to achieve excellent high-temperature wear resistance, high strength, and improved high-temperature strength

Active Publication Date: 2014-02-19
ANHUI JINYI NEW MATERIALS CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the density, strength, sinkage and interference during operation of the above-mentioned nickel-based and iron-based valve seat rings are not ideal, and they cannot withstand the high-temperature dry wear and cavitation damage caused by long-term combustion of natural gas on the valve seat rings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The chemical composition of a rare earth powder metallurgy natural gas engine valve seat includes: 1.0% carbon, 12.0% chromium, 18.0% molybdenum, 23.0% cobalt, 6.0% nickel, 22.0% tungsten, 0.2% cerium, and the rest is Iron, with a particle size of 70 mesh, adding lubricating oil and binder polyacrylate, and preparing the natural gas engine valve seat according to the process of batching→mixing→pressing→testing→sintering→testing→heat treatment→machining→testing. After testing, its density is 8.0g / cm 3 , the hardness is 42HRC, and the crushing strength is 1280MPa; at 950°C, after 1000 hours of engine bench test, the subsidence is 100μm, and the interference remains at 85μm.

Embodiment 2

[0030] The chemical composition of a rare earth-containing powder metallurgy natural gas engine valve seat includes 1.3% carbon, 15.0% chromium, 19.0% molybdenum, 22.0% cobalt, 8.0% nickel, 23.0% tungsten, 0.6% lanthanum, and the rest is iron , the particle size is 70 mesh, add lubricating oil and binder polyacrylate, and prepare the natural gas engine valve seat according to the process of batching→mixing→pressing→testing→sintering→testing→heat treatment→machining→testing. After testing, its density is 7.9g / cm 3 , the hardness is 44HRC, and the crushing strength is 1280MPa; at 950℃, after 1000 hours of engine bench test, the sinking amount is 110μm, and the interference amount remains at 86μm.

Embodiment 3

[0032] The chemical composition of a rare earth-containing powder metallurgy natural gas engine valve seat includes: carbon 1.3%, chromium 18.0%, molybdenum 21.0%, cobalt 24.0%, nickel 9.0%, tungsten 23.0%, cerium-rich mixed rare earth (Ce +La) 0.4%, the rest is iron, the particle size is 70 mesh, add lubricating oil and binder polyacrylate, prepare the natural gas engine according to the process of batching→mixing→pressing→testing→sintering→testing→heat treatment→machining→testing Valve seat ring. After testing, its density is 8.1g / cm 3 , the hardness is 44HRC, and the crushing strength is 1280MPa; at 950℃, after 1000 hours of engine bench test, the subsidence is 120μm, and the interference remains at 88μm.

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Abstract

The invention provides a rare earth-containing powder metallurgy natural gas engine valve seat ring. The chemical composition of the valve seat ring comprises, by mass, 0.8-1.5% of C, 10.0-20.0% of Cr, 16.0-22.0% of Mo, 20.0-25.0% of Co, 4.0-9.0% of Ni, 20.0-24.0% of W, 0.1-0.2% of a rare earth element, 0.1-0.2% of a lubricant, 0.1-0.2% of a binder, and the balance Fe, the granularity of Fe is 60-70 meshes, and the rare earth element can be La, Ce or a Ce-rich mixed rare earth. The valve seat ring has the advantages of ideal hardness, high strength, high density, strong deoxidation and desulfurization abilities, heat resistance, corrosion resistance and the like.

Description

technical field [0001] The invention relates to the field of powder metallurgy manufacturing of key engine parts, in particular to a rare earth-containing powder metallurgy natural gas engine valve seat. technical background [0002] Internal combustion engines use gasoline and diesel as fuel. With the continuous increase of the number of motor vehicles, the consumption of gasoline and diesel has increased significantly, which not only accelerates the depletion of non-renewable petroleum resources, but also emits a large amount of nitrogen. Harmful gases such as , oxygen and sulfide further deteriorate the living environment of human beings and aggravate the global warming effect. For this reason, the development of environmentally friendly new fuels has aroused great concern and attention. Among many alternative petroleum fuels, compressed natural gas (Condensation Natural Gas, CNG), liquefied natural gas (LNG) and liquefied petroleum gas (Liquefied Petroleum Gas, LPG) are...

Claims

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Application Information

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IPC IPC(8): C22C38/52B22F5/00
Inventor 袁春戴泽玉
Owner ANHUI JINYI NEW MATERIALS CORP LTD
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