Читать книгу Henley's Formulas, Recipes and Processes (Applied Chemistry) - Various - Страница 218
Fusible Alloys For Electric Installations.
Оглавление—These alloys are employed in electric installations as current interrupters. Serving as conductors on a short length of circuit, they melt as soon as the current becomes too strong. Following is the composition of some of these alloys.
| Fusing temperature | Lead | Tin | Bismuth | Cadmium | |
|---|---|---|---|---|---|
| I | 203° F. | 250 | 500 | 500 | — |
| II | 193° F. | 397 | — | 532 | 71 |
| III | 168° F. | 344 | 94 | 500 | 62 |
| IV | 153° F. | 260 | 148 | 522 | 70 |
| V | 150° F. | 249 | 142 | 501 | 108 |
| VI | 145° F. | 267 | 136 | 500 | 100 |
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These alloys are prepared by melting the lead in a stearine bath and adding successively, and during the cooling, first, the cadmium; second, the bismuth; third, the tin. It is absolutely necessary to proceed in this manner, since these metals fuse at temperatures ranging from 850° F. (for lead), to 551° F. (for tin).
