摘要:
A method of laser treating a zirconia surface can include surface texturing zirconia using a combination of ablation and melting. The method includes forming a carbon film on the zirconia surface and laser treating the carbon-coated zirconia surface. The carbon film can include titanium carbide (TiC) and boron carbide (B4C), for example. The carbon film can include titanium carbide (TiC) and boron carbide (B4C) in equal proportions. The carbon-coated surface can then be scanned with a nitrogen gas-assisted CO2 laser beam to form a laser-treated surface. The laser-treated surface can include ZrN compounds. The present method can enhance the surface properties of zirconia and improve the structural integrity of zirconia.
摘要:
The invention relates to a mixture containing a gold thiolate, a rhodium(III) compound, and a solvent that contains at least one OH group, in which the mixture has a ratio V=(a)/(b)≧2.2; (a) is the fraction of solvent and (b) is the gold fraction of the gold thiolate, each relative to the total weight of the mixture.
摘要:
In some examples, a method includes identifying a damaged area in a ceramic matrix composite coating of an in-service component; applying a restoration slurry to the damaged area of the ceramic matrix composite coating, wherein the restoration slurry comprises a liquid carrier and a restoration coating material; drying the restoration slurry to form a dried restoration slurry; and heat treating the dried restoration slurry to form a restored portion of the ceramic matrix composite coating. In some examples, an assembly may include a component including a substrate and a coating on the substrate, where the coating defines a damaged portion; masking around the damaged portion on undamaged portions of the coating; and a restoration slurry in the damaged portion, wherein the restoration slurry comprises a liquid carrier and a restoration coating material.
摘要:
The present invention solves numerous problems in state-of-the-art industrial anti-corrosion protection by using a reactive silicon oxide precursor solution. Among the problems solved are those of decreased heat transfer over a protected surface, limited protection against high-temperature corrosive fluids and difficulties in protecting complex 3D geometries and surfaces with a high surface roughness. The present invention furthermore provides an easy way of making chemical surface functionalization using e.g. silane chemistry. The invention solves these problems by coating the surface of a ceramic or metallic part with a thin layer of a liquid solution of a reactive silicon oxide precursor (rSiO-p) such as Hydrogen Silsesquioxane (HSQ) in Methyl Isobytul Ketone (MIBK) or volatile methyl siloxane (VMS), heating the part to a curing temperature of the rSiO-p, and after a curing time the reactive silicon oxide precursor is transformed into a thin layer of essentially pin-hole free silicon oxide.
摘要:
A bright noble metal preparation for firing on ceramic/porcelain surfaces at a minimum temperature of 900° C. The preparation has at least one organic noble metal compound including at least one of an organic gold, platinum, silver and palladium compound, at least one flux that consists of organometallic compounds including Cr in the form of at least one organic compound, such that a Cr content is 0.01 to 1.0 mole per mole of noble metal, and at least one vehicle. The bright noble metal preparation is rhodium-free and has a noble metal content of 6 to 20 wt. %, based on the preparation.
摘要:
A coating composition for metal or refractories includes a polysilazane resin; and one or more additives that alter the thermal conductivity and/or the abrasion resistance of the cured polysilazane resin. The coating composition may be applied to a metal or refractory material substrate and heated to form a ceramic layer on the substrate. The ceramic layer exhibits lower thermal conductivity and increased abrasion resistance.
摘要:
A method of smoothing the surface of a ceramic matrix composite material part that presents a surface that is undulating and rough. The method includes depositing a refractory vitreous coating on the surface of the part, the vitreous coating essentially containing silica, alumina, baryte, and lime.
摘要:
A composite article includes a substrate and a powder-derived composite coating on the substrate. The composite coating includes discrete regions of a first material and discrete regions of a second material. At least one of the first material or the second material is a chemical precursor.
摘要:
A method of smoothing the surface of a ceramic matrix composite part presenting a surface that is undulating and rough. The method includes forming a ceramic coating on the surface of the part, the coating being made by applying a liquid composition on the surface of the part, the composition containing a ceramic-precursor polymer and a factory solid filler, curing the polymer, and transforming the cured polymer into ceramic by heat treatment. The method further includes impregnating the ceramic coating with a liquid metallic composition.
摘要:
A precursor of a ceramic adhesive suitable for use in a vacuum, thermal, and microgravity environment. The precursor of the ceramic adhesive includes a silicon-based, preceramic polymer and at least one ceramic powder selected from the group consisting of aluminum oxide, aluminum nitride, boron carbide, boron oxide, boron nitride, hafnium boride, hafnium carbide, hafnium oxide, lithium aluminate, molybdenum silicide, niobium carbide, niobium nitride, silicon boride, silicon carbide, silicon oxide, silicon nitride, tin oxide, tantalum boride, tantalum carbide, tantalum oxide, tantalum nitride, titanium boride, titanium carbide, titanium oxide, titanium nitride, yttrium oxide, zirconium boride, zirconium carbide, zirconium oxide, and zirconium silicate. Methods of forming the ceramic adhesive and of repairing a substrate in a vacuum and microgravity environment are also disclosed, as is a substrate repaired with the ceramic adhesive.