Battelle Memorial Institute

Gerard Horlaville

Herbert Schachner

Erich Bergmann

The laminate material comprises a sintered silicon carbide substrate (S) on which there is deposited by CVD a diamond layer in an enclosure (1) fed with 1% methane in hydrogen through a conduit (13), this gas mixture being activated by a hot tantalum filament raised to 2000.degree. C. This layer is thereafter covered, in another enclosure, with an AlN layer formed from a mixture of H.sub.2 +2% AlCl.sub.3 reacting with a mixture of H.sub.2 +1% NH.sub.3.

Laminate material and its use as heat-sink

The invention concerns a process for manufacturing electrodes for fuel cells operating at elevated temperatures, said process consisting in depositing by cathodic sputtering on a solid electrolyte substrate active mixtures of oxides and metals. The control of the relative rates of deposition of the various constituents of these active compositions is achieved by regulating individually independent magnetic fields acting on each of the components subjected to sputtering. A very high degree of homogeneity within the layers and of reproducibility of the compositions of the mixtures is achieved in this manner.

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Reignier, France

Gerard Horlaville