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Ni-cr-co-based alloy having high-temperature corrosion resistance properties, and poppet valve having surface modified with same

A technology of high temperature corrosion resistance and surface modification, applied in the direction of lift valve, valve details, valve device, etc., can solve the problems of low thermal shock resistance, cracked coating layer, unable to obtain aging resistance, etc., to improve high temperature resistance. Corrosion characteristics, effect of excellent high temperature corrosion resistance

Active Publication Date: 2015-07-22
FUKUKA METAL FOIL & POWDER CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] However, in the coating using ceramics such as chromium carbide and yttria-stabilized zirconia, when the coating layer is peeled off, the hard ceramic bites between the valve and the valve seat, which may damage the valve and the valve seat.
[0021] In addition, in the high-Cr-based spraying materials shown in Patent Documents 9 to 15, since the Cr-rich solid solution forms a matrix, the resistance to thermal shock is low, and cracks and peeling may occur in the coating layer, and the desired coating cannot be obtained. Satisfactory aging resistance

Method used

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  • Ni-cr-co-based alloy having high-temperature corrosion resistance properties, and poppet valve having surface modified with same
  • Ni-cr-co-based alloy having high-temperature corrosion resistance properties, and poppet valve having surface modified with same
  • Ni-cr-co-based alloy having high-temperature corrosion resistance properties, and poppet valve having surface modified with same

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Embodiment

[0049] The Example alloys of the present invention and Comparative Example alloys adjusted and blended as described above were smelted, the Charpy impact value was measured by the following method, and a high temperature corrosion test was carried out. In addition, evaluation of film properties after thermal spraying using alloy powder produced by a spray method was also carried out.

[0050] (1) Charpy impact test; use an electric furnace to heat a 100g billet with the composition of each alloy to about 1600°C in an argon flow, melt it, cast it into a shell mold, and machine it into a test piece recorded in JIS Z2242:2005 (no notch). Then, using a Charpy impact tester, an impact test based on JIS Z 2242:2005 was performed to measure an impact value.

[0051] It should be noted that, in Patent Documents 9 to 15, since alloys with a Cr content of more than 60% by mass cannot be melted in an electric furnace set at about 1600° C., comparative studies were abandoned (the patents...

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Abstract

Provided are: a surface-coating material having excellent cracking resistance and peeling resistance and also having excellent high-temperature corrosion resistance properties; and a poppet valve coated with the surface-coating material. A Ni-Cr-Co-based alloy according to the present invention comprises 40.0 to 50.0 mass% of Cr, 10.0 to 20.0 mass% of Co, 0.5 to 5.0 mass% of Nb, 0.01 to 5.0 mass% of Fe and 0.1 to 3.0 mass% of Si, with the remainder being 26.0 to 40.0 mass% of Ni and unavoidable impurities. The Ni-Cr-Co-based alloy may additionally comprise an element or elements respectively selected from Mo, W, Mn, Ti, Al, B and C in the total amount of 5.0 mass% or less, wherein the content of each of Ti and Al is 3.0 mass% or less and the content of each of B and C is 1.0 mass% or less. In the poppet valve according to the present invention, at least the front surface of a head part is coated with the Ni-Cr-Co-based alloy.

Description

technical field [0001] The present invention relates to materials for surface modification used in various construction processes such as high-velocity flame spraying, plasma spraying, PTA powder surfacing, and vapor deposition, and in particular to materials used in components requiring high-temperature corrosion resistance A Ni-Cr-Co alloy with high temperature corrosion resistance, and a surface-modified poppet valve using this alloy. Background technique [0002] Conventionally, in poppet valves that require high-temperature corrosion resistance, heat-resistant alloys are generally used as valve base materials. However, in recent years, the high-temperature corrosion environment has become more severe due to the deterioration of the fuel used and the high temperature of the combustion gas accompanying the increase in the output of the engine, and the service life of the valve has been shortened. That is, on the surface of the valve head of the suction valve and the exha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/06C22C30/00C23C4/08
CPCF16K25/005C22C27/06F01L3/04C22C30/00F01L2103/00F01L3/00F01L2820/01F01L2303/00F16K27/00
Inventor 乙部胜则西村信一仓桥一宪高桥佳弘
Owner FUKUKA METAL FOIL & POWDER CO LTD
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