{
  "$type": "site.standard.document",
  "description": "A glow plug (1) includes a cylindrical tube (7) which has a closed front end portion, a heating coil (9) which is inserted into the inside of the tube (7), and a seal portion (11) which is formed on a rear-end-side opening of the tube (7) and seals the inside of the tube (7). The heating coil (9)…",
  "path": "/patents/991414",
  "publishedAt": "2013-05-01T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F23Q7/001",
    "NGK SPARK PLUG CO [JP]"
  ],
  "textContent": "A glow plug (1) includes a cylindrical tube (7) which has a closed front end portion, a heating coil (9) which is inserted into the inside of the tube (7), and a seal portion (11) which is formed on a rear-end-side opening of the tube (7) and seals the inside of the tube (7). The heating coil (9) is made of a metal material containing W or Mo as a main component, and the tube (7) is made of an alloy containing 0.5 mass% or more and 5.0 mass% or less of Al and 20 mass% or more and 40 mass% or less of Cr. By allowing the tube (7) to contain a predetermined quantity or more of Al or Cr, the oxidation resistance of the tube (7) can be enhanced and, at the same time, an oxygen partial pressure inside the tube (7) is lowered and hence, the oxidation of the heating coil (9) can be suppressed. As a result, durability of both the heating coil (9) and the tube (7) can be enhanced and hence, a glow plug can realize the heat generation at a higher temperature over a long period.",
  "title": "GLOWPLUG, PRODUCTION METHOD THEREOF AND HEATING DEVICE"
}