| 摘要 |
Coating carbon component with a thin film of a carbide of gp. IVB, VB and/or VIB metal(s) is carried by a meniscus process using an alloy based on Pb, Zn, Pb-Zn or Zn-A1 and contg. 0.1-10wt.% gp. IVB, VB and/or VIB metal(s) by heating 0.1-30 min. at 700-1100 deg. C to form a wettable electroconductive film on the component. If a Pb-Zn or Zn-A1 alloy is used, the Zn content is pref. 15-45 wt.%, the coating temp. being higher for the lower Zn contents with Zn-A1 alloys and max. 960 deg. C for an alloy A1 alloy with min. 40 wt.% Zn. For Pb-Zn alloys with max. 95 wt.% Pb, the max. coating temp. is 900 deg. C. The meniscus process is carried out under a protective gas, pref. without excess pressure and without protective melt. The metal added to the alloy is Ti, Ta, Cr or W. The process is useful for producing wettable protective, adhesive or contact films on porous or nonporous carbon filaments, fibres, fabrics, felts or mouldings, including electrodes for A1 mfr. A firmly adhering carbide film is formed rapidly and impurities are not introduced. In examples, uses include current collectors for lead-acid batteries. |
