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Clad electrode for spark plug and method for manufacturing same

A manufacturing method and spark plug technology, which are applied in spark plug manufacturing, spark plugs, circuits, etc., can solve problems such as falling off of precious metal sheets, and achieve the effect of preventing peeling or falling off, realizing long life and reliable bonding.

Inactive Publication Date: 2014-04-30
TANAKA PRECIOUS METAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, in the recent internal combustion engines, the use environment of spark plugs is high temperature, and there are many problems such as heat generation and thermal cycle of heat dissipation caused by repeated discharge and ignition, and there are many problems such as falling off of precious metal sheets, and the life of spark plugs is shortened. Finish

Method used

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  • Clad electrode for spark plug and method for manufacturing same
  • Clad electrode for spark plug and method for manufacturing same
  • Clad electrode for spark plug and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First, if Figure 1A As shown, a cylindrical noble metal sheet 2 made of a Pt-Rh20% alloy with a diameter of 1.0 mm and a thickness of 0.3 mm is placed in contact with a strip-shaped substrate 1 made of a Ni-Ir1% alloy with a thickness of 0.3 mm. , the noble metal sheet 2 is perpendicular to the substrate. When the noble metal piece 2 is brought into contact with the surface of the strip-shaped substrate 1, the noble metal piece is perpendicular to the substrate so that no gap or partial contact occurs between the contact surface of the noble metal piece and the substrate surface.

[0037] Next, if Figure 1B As shown, electrodes ( 3 , 3 ′) for resistance welding were respectively connected to the base material 1 and the precious metal sheet 2 , and resistance welding was performed under the conditions of applied pressure 7kgf, welding current 1350A, and energization time 9msec to perform preliminary joining. In the present embodiment, two types of pre-joined cladding ...

Embodiment 2

[0046] As Experiment 2, the same material as Experiment 1 was prepared, and as preliminary joining conditions, the applied pressure was the same 7kgf, compared with the resistance welding conditions of Example 1, the output was reduced to 1110A, and the energization time was 100msec. Furthermore, a clad electrode subjected to a diffusion bonding process under the same heat treatment conditions as in Example 1 (1100° C.×1 hour) was produced. The characteristics of the clad electrode of this Example 2 are the same as those of Example 1.

Embodiment 3

[0048] As Example 3, using the same combination of materials as in Example 2, setting the same pre-joining conditions as in Example 2, and manufacturing such that the subsequent heat treatment conditions were changed to the high temperature side, 1200°C x 1 hour for diffusion Join the treated clad electrode. The cross-section of the clad electrode of Example 3 was observed, and the diffusion layer was 50 μm.

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Abstract

The present invention is a clad electrode for a spark plug used for a center electrode and a ground electrode of a spark plug comprising a precious-metal tip arranged on a distal-end portion of the spark plug and a substrate to which the precious-metal tip is joined; wherein the clad electrode is characterized in that the interface where the precious-metal tip and the substrate are welded is flat, and a diffusion layer having a thickness of 5 to 100 [mu]m is formed on the welding region. The clad electrode is manufactured by bringing the welding surface of the substantially cylindrical precious-metal tip into contact with the surface of the substrate, preliminarily welding the precious-metal tip to a surface of the substrate by resistance welding, punching a portion where the substrate and the precious-metal tip are integrated, and diffusion-welding the substrate and the precious-metal tip using a heat treatment.

Description

technical field [0001] The present invention relates to electrodes (a center electrode and a ground electrode) of a spark plug, and more particularly to a cladding electrode for a spark plug in which a precious metal sheet and a base material are bonded, and a method for manufacturing the same. Background technique [0002] In recent years, a so-called clad electrode in which a noble metal piece made of a Pt alloy or an Ir alloy is bonded to a base material such as a Ni alloy or Cu alloy is known as a center electrode of a spark plug used in an internal combustion engine or the like. [0003] The noble metal sheet and the base material of the clad electrode for such a spark plug are made of different materials, and resistance welding or laser welding is used to ensure the stability of the joint when joining them (for example, refer to Patent Document 1). [0004] However, when joining a noble metal sheet to a base material such as a Ni alloy, the joint strength cannot be sat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/20
CPCH01T13/20H01T13/39H01T21/02
Inventor 野村幸正今井雅满田中邦弘
Owner TANAKA PRECIOUS METAL IND
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