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AssigneeSociete Nouvelle de Metallisation Industries
InventorsJean-Marie Dubois, Philippe Cathonnet
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The invention relates to the thermal barriers, to a process and material for their production, and to their application. Thermal barriers consist of a material comprising at least one refractory oxide with low thermal diffusivity and at least one quasicrystalline aluminum alloy, the proportion of which represents from 2-30% by volume. They can be produced by deposition of a mixture of refractory oxide and of quasicrystalline alloy in vapor phase, or from a mixture of refractory oxide and quasicrystalline aluminum alloy in the molten state, or else by deposition onto the support to be protected with the aid of an oxygen-gas torch fed with material using a flexible cord which contains the refractory oxide and the quasicrystalline alloy. The applications include the protection of components of aircraft or motor vehicle engines, of aeronautical or aerospace components, of chemical reactors or of electrical households appliances.
A thermal barrier comprising at least one refractory oxide which has a low thermal diffusivity and at least one quasicrystalline aluminum alloy containing at least 80% by volume of at least one quasicrystalline phase, the proportion of quasicrystalline alloy representing from approximately 2 to approximately 30% by volume.
A material for use in the production of thermal barriers, comprising a mixture of powder of at least one refractory oxide which has a thermal diffusivity lower than 5 mm.sup.2 /s, and of powder of at least one quasicrystalline aluminum alloy, in which the proportion by volume of quasicrystalline alloy is from approximately 2 to approximately 30% by volume, and the powders have a particle size which allows the mixture to flow and a particle diameter distribution of between 10 and 45 .mu.m.
A material for use in the production of thermal barriers, in the form of a flexible cord, said material consisting essentially of a mixture of (i) at least one quasicrystalline aluminum alloy in the form of powder and of (ii) at least one finely divided powder selected from pure zirconia and stabilized zirconia, the aluminum alloy representing not more than 30% by volume.
Dependencies are inferred from the claim text.