{
  "$type": "site.standard.document",
  "description": "Peeling (detachment) and deformation and the like of a chip is effectively prevented. A spark plug 1 is provided with: a central electrode 5; a ground electrode 27 forming a spark discharge gap 33 with the center electrode 5; and a chip 31(32) welded to at least one of the electrodes 5 and 27. The…",
  "path": "/patents/956124",
  "publishedAt": "2015-11-04T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02P13/00",
    "NGK SPARK PLUG CO [JP]"
  ],
  "textContent": "Peeling (detachment) and deformation and the like of a chip is effectively prevented. A spark plug 1 is provided with: a central electrode 5; a ground electrode 27 forming a spark discharge gap 33 with the center electrode 5; and a chip 31(32) welded to at least one of the electrodes 5 and 27. The chip 31(32) has a thermal expansion coefficient smaller than a thermal expansion coefficient of the electrode 27(5) to which the chip is welded, and the difference between the content A (mass%) of a noble metal component in the chip 31 (32) and the content B (mass%) of a noble metal component in the electrode 27(5) (A - B) is 50 mass% or more. In an intermediate layer 34(35) between the chip 31(32) and the electrode 27(5), holes 38(39) are present. When the length of a boundary between the chip 31(32) and the intermediate layer 34(35) is L (mm), and the length of the holes 38(39) in a direction along the boundary of the chip 31 (32) and the intermediate layer 34(35) is N (mm), 0.1 ¤ N/L ¤ 0.4.",
  "title": "SPARK PLUG"
}