Spark plug
A spark plug and spark gap technology, applied in the field of spark plugs, can solve the problems of increased thermal stress and peeling off of discharge components, and achieve the effects of inhibiting peeling and consumption
Active Publication Date: 2020-10-16
NGK SPARK PLUG CO LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
In the spark plug in which the first electrode of the discharge member and the base material is joined to the second electrode across the spark gap, the temperature of the first electrode rises, and the thermal stress at the junction of the discharge member increases, so the discharge member has possible stripping
Method used
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Embodiment
[0072] The present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.
[0073] (Production of samples 1-63)
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Provided is a spark plug such that separation and wear of a discharging member connected to a base material can be suppressed. This spark plug has a base material to which at least a portion of a discharging member is connected via a diffusion layer, the base material comprising 50 mass% or more of Ni, 8 to 40 mass% of Cr, 0.01 to 2 mass% of Si, 0.01 to 2 mass% of Al, 0.01 to 2 mass% of Mn, 0.01 to 0.1 mass% of C, and 0.001 to 5 mass% of Fe. The discharging member comprises at least Pt out of a P group (Pt, Rh, Ir, and Ru) and Ni. (K+L) / (M+N)<=1.14 is satisfied, where K is the atom concentration of the P group of the discharging member, L is the atom concentration of the P group of the base material, M is the atom concentration of Ni of the discharging member, and N is the atom concentration of Ni of the base material.
Description
technical field [0001] The present invention relates to a spark plug, and more particularly, to a spark plug in which at least a part of a discharge member is bonded to a base material through a diffusion layer. Background technique [0002] The temperature of the electrode of the spark plug tends to increase in the use environment as the performance of the engine increases, the combustion efficiency improves, and the like. In the spark plug in which the first electrode of the discharge member and the base material is joined to the second electrode across the spark gap, the temperature of the first electrode rises, and the thermal stress at the junction of the discharge member increases, so the discharge member has May peel. Therefore, in the technology of Patent Document 1, the high temperature strength and high temperature corrosion resistance are improved and the peeling of the discharge member is suppressed by making the base material contain 0.05% by mass to 5% by mass...
Claims
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IPC IPC(8): H01T13/39H01T13/20H01T21/02
CPCH01T13/20H01T13/39H01T21/02C22C5/04C22C19/05
Inventor 角力山大典伊藤和树
Owner NGK SPARK PLUG CO LTD