| 摘要 |
The present invention is directed to overcome such a problem associated with a sprinkler head made of In-based alloy with no use of Pb or Cd that in contradiction with the fact that a testing temperature in a strength test of a sprinkler head is proximal to a melting temperature of a solder alloy used in a heat-sensitive decomposition structure of the sprinkler head, and therefore a good creeping property over a higher temperature zone in which a sprinkler is activated is required, typically, the sprinkler head made of the In-based alloy with no use of Pb or Cd could not achieve the creeping property over the higher temperature zone in which the sprinkler is activated as favorably as any conventional sprinkler head using Pb or Cd could do, and could occasionally end in failure in a durability test. To solve the above problem, the present invention provides an alloy usable for a heat-sensitive material in a sprinkler head, which is composed of Sn in an amount of 0.1-2.0% by mass, Bi in an amount of 31-37% by mass and In for balance for a temperature range around 70-75°C or which is composed of Zn in an amount of 0.05-0.4% by mass, Bi in an amount of 43-55% by mass and In for balance for a temperature range around 90-95°C. |
