C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
C25C 3/08 (2006.01)
Patent
CA 2354007
In one aspect, the process comprises providing a carbonaceous cathode substrate, and forming at least one layer of a metal boride-containing composite refractory material over the substrate, wherein the surface of the carbonaceous substrate to be coated is roughened prior to the formation of the layer overlying the said surface. The roughening of the surfaces reduces the tendency of the layers to separate in high temperature operating conditions. In another aspect, the process comprises providing a carbonaceous cathode substrate, and forming at least two coating layers of a metal boride-containing composite refractory material successively over the substrate, wherein the content of metal boride in the coating layers increases progressively as the distance of the layer from the substrate increases. By graduating the content of metal boride among several coating layers, the effect of differences in thermal expansion rates between carbon and metal boride are attenuated. The metal of the metal boride is selected from the group consisting of titanium, zirconium, vanadium, hafnium, niobium, tantalum, chromium and molybdenum.
Selon un aspect, le procédé selon l'invention consiste à prévoir un substrat de cathode carbonée, et à former au moins une couche d'un matériau réfractaire composite à base de borure métallique sur ledit substrat. La surface de ce substrat carboné à enrober est dégrossie avant de former la couche qui la recouvre. Ce dégrossissage des surfaces diminue la tendance des couches à se séparer dans des conditions de fonctionnement à forte température. Selon un autre aspect, le processus consiste à prévoir un substrat de cathode carbonée, et à former, successivement sur le substrat, au moins deux couches d'enrobage d'une matériau réfractaire composite à base de borure métallique. Plus la distance entre la couche et le substrat augmente, plus cette teneur en borure métallique augmente. En graduant la teneur en borure métallique parmi les couches de l'enrobage, l'effet des différences de taux de dilatation thermique entre le carbone et le borure métallique s'atténue. Le métal du borure métallique est sélectionné dans le groupe se composant de titane, zirconium, vanadium, hafnium, niobium, tantale, chrome et molybdène.
Alcan International Limited
Kirby Eades Gale Baker
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