Abstract:
A part made of a porous material containing carbon, in particular a C/C composite material, is protected against oxidation by being impregnated with a composition in an aqueous medium containing at least a phosphorous compound, elemental titanium, and boron or a boron compound other than titanium diboride, to form in the presence of oxygen and at least one alkali or alkaline-earth element M that catalyzes oxidation of carbon, at least one P—O—Ti-M type association bonded by boron oxide B2O3 and trapping the element M.
Abstract translation:由含有碳的多孔材料(特别是C / C复合材料)制成的部件通过在至少含有磷化合物,元素钛和硼或硼化合物的水性介质中浸渍组合物来防止氧化 在二氧化硼的存在下形成催化碳的氧化的至少一种碱金属或碱土金属元素M,至少一种由氧化硼B 2 O 3键合的P-O-Ti-M型缔合物并捕获元素M 。
Abstract:
In order to provide a self-healing layer on a composite material part, a composition is applied to the part, the composition containing: a suspension of colloidal silica; boron or a boron compound in powder form; silicon carbide in powder form; and at least one ultra-refractory oxide.
Abstract:
A part made of a porous material containing carbon, in particular a C/C composite material, is protected against oxidation by being impregnated with a composition in an aqueous medium containing at least a phosphorous compound, elemental titanium, and boron or a boron compound other than titanium diboride, to form in the presence of oxygen and at least one alkali or alkaline-earth element M that catalyses oxidation of carbon, at least one P—O—Ti-M type association bonded by boron oxide B2O3 and trapping the element M.
Abstract translation:由含有碳的多孔材料(特别是C / C复合材料)制成的部件通过在至少含有磷化合物,元素钛和硼或硼化合物的水性介质中浸渍组合物来防止氧化 在二氧化硼的存在下形成催化碳的氧化的至少一种碱金属或碱土金属元素M,至少一种由氧化硼B 2 O 3键合的PO-Ti-M型缔合物并捕获元素M.
Abstract:
A part made of a composite material containing carbon, having an open internal residual porosity is protected against oxidation by performing at least one stage in which an impregnating composition is applied, said impregnating composition containing at least one metal phosphate and titanium diboride. Efficient protection against oxidation is thus obtained at temperatures of more than 1000° C., also in the presence of a carbon oxidation catalyst and in a damp medium.
Abstract:
An oxidation-sensitive composite has applied thereto a composition comprising a mixture of boride powder constituted for the most part of TiB2, at least one vitreous refractory oxide powder constituted for the most part by a mixture of borosilicate glass, and a binder containing a ceramic-precursor resin. The resin is cured and is subsequently transformed into a ceramic by heat treatment or during first exposure of the coated part to high temperatures.
Abstract:
The method includes depositing on the entire surface of a substrate a refractory cement paste formed by a powder mainly constituted by silica and alumina and mixed with a liquid. The method includes filling the cement paste in hollow portions in a relief of the surface; performing a heat treatment to harden the cement paste after it has set to obtain a first coating layer of refractory cement; and depositing a slip on the first layer, and formed of a glass frit in suspension in a liquid. The method includes performing a heat treatment for glazing by softening and spreading the glass in order to obtain a second coating layer forming a glaze covering the first layer. The composition of the glass frit is selected to form a glass having a glazing temperature lower than 1100° C. and a glass transition temperature lower than 750° C.
Abstract:
In order to provide a self-healing layer on a composite material part, a composition is applied to the part, the composition containing: a suspension of colloidal silica; boron or a boron compound in powder form; silicon carbide in powder form; and at least one ultra-refractory oxide.