| 摘要 |
<p>An electrical heating element for use in a soldering iron or soldering bit. This heating element comprises a resistive element consisting of granular boron carbide packed in a quartz tube closed at one end by a plus of heat resistant, insulating material. The resistive element is embedded in a piece of copper which is in electrical contact with the boron carbide packed in the quartz tube, at the other end thereof. A first power lead is electrically connected to the boron carbide at the closed end of the quartz tube. This first power lead passes through and is electrically insulated from the piece of copper. The second power lead is electrically connected to the piece of copper embedding the resistive element. In use, connection of the first and second leads to an electrical power source causes the resistive element to generate heat in a very fast manner and to transmit this heat to the piece of copper.</p> |
