| 摘要 |
A bimetallic electric connector for copper to aluminium joints is made by first forming a bulk component of aluminium (typically a stock aluminium connector) and then coating an appropriate part of its surface with copper or a conductive copper alloy (such as brass) by a thermal spray coating technique, such as plasma spraying or gas-wire metallising. The coating may be porous, in which case the use of a pore sealant e.g. an air-drying glyceride resin is recommended and this may also form a corrosion-resistant layer over the edge of the copper (or copper alloy) coating. Suitable coating and sealing techniques are commercially available. The technique is less expensive than conventional friction welding, and offers additional design flexibility. The connector illustrated in Fig. 1 comprises an aluminium tube 1 flattened at one end to form a palm 2 through which are formed holes 3, 3, the entire surface area to the left of the line 4 being coated with copper. <IMAGE> |
