| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that though creep characteristics for a sprinkler to work under high temperature are required because test temperature of strength test of a sprinkler head is near melting temperature of solder alloy used for a thermosensitive decomposing part of the sprinkler head, a sprinkler head made of In-based alloy not using Pb, Cd has lower creep characteristics in a high temperature range for the sprinkler to work compared to conventional ones using Pb, Cd and sometimes cannot pass a durability test. SOLUTION: As alloy for thermosensitive material of a sprinkler head, alloy having 0.1-2.0 mass% Sn, 31-37 mass% Bi, and balance In for about 70-75°C, and alloy having 0.05-0.4 mass% Zn, 43-55 mass% Bi, and the balance In for about 90-95°C are used as alloy for thermosensitive material of a thermosensitive decomposing part. COPYRIGHT: (C)2008,JPO&INPIT
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