Refractory and temperature-resistant composite material...

C - Chemistry – Metallurgy – 04 – B

Patent

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261/24, 6/45, 30

C04B 35/565 (2006.01) C22C 29/02 (2006.01) C22C 29/18 (2006.01) C22C 49/14 (2006.01) H05B 3/14 (2006.01) C22C 27/04 (2006.01)

Patent

CA 2336695

The present invention pertains to the production of materials used in high- temperature oxidising media, wherein said materials can be used in the production of high-temperature electric heaters as well as in the production of parts, sensors and instruments operating at temperatures of 1900 °C and above. These materials, which essentially contain tungsten and molybdenum silicides MeSi2-Me5Si3 as well as silicon carbide, are characterised in that they exhibit high levels of heat- resistance, of resistance to thermal shocks, of high-temperature strength and of wear resistance. Doping with rhenium, tantalum, titanium, zirconium, niobium and hafnium silicides increases the mechanical properties of these materials. These materials, which have a desired porosity, can be used for increasing the specific electric resistance and for reducing thermal conductivity relative to high-density materials, while having a reduced density.

Cette invention se rapporte à la production de matériaux que l'on utilise dans des milieux oxydants à des températures élevées, et qui servent en outre à la fabrication d'unités de chauffage électrique à haute température, ainsi que de pièces, de capteurs et d'instruments fonctionnant à des températures de 1900 DEG C et plus. Ces matériaux, qui sont à base de siliciures de tungstène et de molybdène MeSi2-Me5Si3 et de carbure de silicium, se caractérisent en ce qu'ils possèdent des niveaux élevés de thermorésistance, de résistance aux chocs thermiques, de résistance aux hautes températures et de résistance à l'usure. Le dopage à l'aide de siliciures de rhénium, de tantale, de titane, de zirconium, de niobium et de hafnium permet d'accroître les propriétés mécaniques de ces matériaux. Ces matériaux, qui possèdent une porosité voulue, permettent d'accroître la résistance électrique spécifique et de réduire la conductivité thermique par rapport aux matériaux de forte densité, ceci tout en ayant une densité moindre.

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