{
  "$type": "site.standard.document",
  "description": "A spark plug (1) includes a center electrode (5), a ground electrode (27), and a noble metal tip (32). The noble metal tip (32) is joined to at least one object member of the two electrodes (5) and (27) via a fusion zone (35). As viewed on a plane of projection (PF), a projected overlap region…",
  "path": "/patents/986105",
  "publishedAt": "2013-02-20T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02P13/00",
    "NGK SPARK PLUG CO [JP]"
  ],
  "textContent": "A spark plug (1) includes a center electrode (5), a ground electrode (27), and a noble metal tip (32). The noble metal tip (32) is joined to at least one object member of the two electrodes (5) and (27) via a fusion zone (35). As viewed on a plane of projection (PF), a projected overlap region (AR2) of the noble metal tip (32) and the fusion zone (35) accounts for 70% or more of a projected region (AR1) of the noble metal tip (32). A metal material used to form the object member contains at least Si out of Al and Si such that the amount of silicon is 0.4% by mass or higher and such that the total amount of Al and Si is 0.5% by mass to a predetermined amount. Multi-fusion spots (35X) exist on the surface of the fusion zone (35). Segments of a baseline (BL) which pass through the respective multi-fusion spots (35X) have a total length of a predetermined percentage of the length of the baseline (BL). By virtue of this, in the case where an object of joining contains Si, etc., joining strength for the noble metal tip (32) can be greatly improved.",
  "title": "SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD OF MANUFACTURING SPARK PLUG"
}