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Oxidation protective multilayer coatings for carbon-carbon composites
No full textAn oxidation protective double layered coating was deposited on a carbon-carbon composite (C/C) using a simple and low cost method. A surface modification of the C/C was obtained by direct reaction of liquid silicon with the C/C, promoting the formation of a 5-10 μm β-SiC layer on the composite surface. The inner layer, in contact with the C/C, is a composite made with a barium borosilicate glass matrix (SABB) and boron carbide particles; the outer layer is another composite layer formed by a SABB glass matrix and yttrium oxide particles. The layers are deposited by a slurry technique. Oxidation tests were carried out in a furnace in air, in order to verify the coating stability and its effectiveness. No mass loss of the C/C composite was observed after 100 h at 1200°C, while after 150 h at 1300°C the C/C mass loss did not exceed 1%
Oxidation barrier multilayer coatings for carbon-carbon composites
No full textAn easy and low-cost slurry method to produce oxidation protective multilayer coatings for carbon-carbon composites (C/C) is reported. The multilayer coatings are made of three layers: a (β-SiC first layer on the C/C surface; a composite made of boron carbide or molybdenum disilicide particles in a barium aluminum boron silicate glass matrix (second layer) and a third (outer) layer obtained by reaction of yttrium oxide particles in the same glass matrix. Thermal cycling oxidation tests of the multilayer coated C/C up to 1300°C in air did not show any appreciable weight loss
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