摘要:
Methods for improving surface roughness of an environmental barrier coating involving providing a component having a plasma sprayed environmental barrier coating; applying a slurry to the environmental barrier coating of the component, the slurry being a transition layer slurry or an outer layer slurry; drying the environmental barrier coating having the applied slurry; and sintering the component to produce a component having an improved surface roughness wherein the slurry includes water; a primary transition material, or a primary outer material; and a slurry sintering aid selected from iron oxide, gallium oxide, aluminum oxide, nickel oxide, titanium oxide, boron oxide, alkaline earth oxides, carbonyl iron, iron metal, aluminum metal, boron, nickel metal, iron hydroxide, gallium hydroxide, aluminum hydroxide, nickel hydroxide, titanium hydroxide, alkaline earth hydroxides, iron carbonate, gallium carbonate, aluminum carbonate, nickel carbonate, boron carbonate, alkaline earth carbonates, iron oxalate, gallium oxalate, aluminum oxalate, nickel oxalate, titanium oxalate, water soluble iron salts, water soluble gallium salts, water soluble aluminum salts, water soluble nickel salts, water titanium salts, water soluble boron salts, and water soluble alkaline earth salts.
摘要:
Methods for improving surface roughness of an environmental barrier coating involving providing a component having a plasma sprayed environmental barrier coating; applying a slurry to the environmental barrier coating of the component, the slurry being a transition layer slurry or an outer layer slurry; drying the environmental barrier coating having the applied slurry; and sintering the component to produce a component having an improved surface roughness wherein the slurry includes water; a primary transition material, or a primary outer material; and a slurry sintering aid.
摘要:
Methods for making an environmental barrier coating using a sintering aid involving: applying a bond coat layer to the ceramic component; combining at least water, and a primary transition material selected from a rare earth disilicate, or a doped rare earth disilicate to produce a transition layer slurry; applying the transition layer slurry to the bon coat layer; drying the component having the applied transition layer slurry; infiltrating a sol-gel solution including an aqueous solution of a water soluble salt sintering aid, or an organic solvent solution of a solvent soluble salt sintering aid into the applied slurry; and sintering the component to produce the environmental barrier coating having at least the bond coat layer, and a transition layer wherein during sintering a reaction between the primary transition material and the sintering aid results in the transition layer having a porosity of from 0% to about 15% by volume of the transition layer.
摘要:
Methods for making an environmental barrier coating using a sintering aid involving: applying a bond coat layer to the ceramic component; combining at least water and a primary transition material selected from a rare earth disilicate or a doped rare earth disilicate to produce a transition layer slurry; applying the transition layer slurry to the bond coat layer; infiltrating a sol-gel solution comprising at least one sintering aid into the applied slurry; and sintering the component to produce the environmental barrier coating having at least the bond coat layer and a transition layer formed from the transition layer slurry during sintering. During sintering the sintering aid dopes the primary transition material with at least one doping composition.
摘要:
Methods for making an environmental barrier coating using a sintering aid involving: applying a bond coat layer to the ceramic component; combining at least water and a primary transition material selected from a rare earth disilicate or a doped rare earth disilicate to produce a transition layer slurry; applying at least the transition layer slurry, and optionally an outer layer slurry and/or compliant layer slurry to the component; and sintering the component to produce the environmental barrier coating. The sintering step causes a reaction between a slurry sintering aid and constituents of at least one of the transition, outer and compliant layers to form a secondary material and reduce porosity in the coating.
摘要:
Water based slurry compositions for making an environmental barrier coating including from about 1 wt % to about 99.9 wt % water; from about 0.1 wt % to about 72 wt % primary material; and from about 0.1 wt % to about 25 wt % slurry sintering aid.
摘要:
Water based slurry compositions for making an environmental barrier coating including from about 1 wt % to about 99.9 wt % water; from about 0.1 wt % to about 72 wt % primary material; and from about 0.1 wt % to about 25 wt % slurry sintering aid.
摘要:
Methods for making an environmental barrier coating using a sintering aid involving: applying a bond coat layer to the ceramic component; combining at least water, a primary transition material selected from a rare earth disilicate, or a doped rare earth disilicate, and at least one slurry sintering aid to produce a transition layer slurry; combining at least water, and a primary outer material selected from a rare earth monosilicate or a doped rare earth monosilicate to produce an outer layer slurry; combining at least water, and a primary compliant material of BSAS or a rare earth doped BSAS to produce a compliant layer slurry; applying at least the transition layer slurry, and any one or more of the outer layer slurry, and the compliant layer slurry to the component; and sintering the component to produce the environmental barrier coating having at least the bond coat layer, a transition layer and any of an outer layer or a compliant layer where a reaction between the primary materials and the slurry sintering aid results in the transition layer having a porosity of from 0% to about 15% by volume of the transition layer, the outer layer having a porosity of from 0% to about 30% by volume of the outer layer, and the compliant layer having a porosity of from about 0% to about 30% by volume of the compliant layer.