| 摘要 |
1,007,190. Thermo-electric devices. BORGWARNER CORPORATION. Dec. 28, 1962 [Jan. 4, 1962], No. 48853/62. Heading H1K. A carrier for thermoelectric elements comprises a thermally conductive, electrically insulating plate which has a metallic layer bonded to one side thereof with a further layer of metal electroplated on to the first layer and a third layer of metal alloy bonded to the second layer, selected portions of the metallic layers being subsequently removed, so exposing parts of the plate and providing a plurality of discrete, isolated conductive regions on the plate surface. In the embodiment described (Fig. 1), two stages of a thermoelectric cascade device are formed by the electrical series interconnection of alternately P and N-type semiconductor bodies. The stages are mounted between insulating, thermally conductive plates 32a, 32c, and separated electrically by a similar plate 32b. The elements may be of bismuth telluride or antimony telluride. The copper bridging members 24, joining the semi-conductor elements are thermally and physically connected to the plate 32b by junctions 30. These junctions 30 (Fig. 3) are produced initially by fusing a silver paste to one face of a sapphire or aluminium oxide plate 32b and then electroplating copper on to the silver surface, followed by the tinning of the copper layer by a leadtin solder. Selected portions of the composite metal layer are then removed, with a abrasive cutter, leaving regions 30 on the plate surface which are positioned so as to accommodate the bridging members 24 (Fig. 1). Use of the device in a radiation detection system in which the thermoelectric device is employed in an evacuated environment is also referred to. Reference is also made to cascade thermo-electric devices involving more than two stages and the use of the junction 30 fabrication may be extended to both sides of the intermediate plate 32b. |
