A rim-rotor assembly has an annular structure including a composite rim and a hub. Blades project from the hub, tips of the blades contacting the annular structure, the blades configured to be loaded in compression against the annular structure. A thermal barrier is in the annular structure, the thermal barrier defining at least part of a radially inward surface of the annular structure. The tips of the blades contact the thermal barrier, the thermal barrier being a thermal barrier coating.

A rim-rotor assembly has an annular structure including a composite rim and a hub. Blades project from the hub, tips of the blades contacting the annular structure, the blades configured to be loaded in compression against the annular structure. A thermal barrier is in the annular structure, the thermal barrier defining at least part of a radially inward surface of the annular structure. The tips of the blades contact the thermal barrier, the thermal barrier being a thermal barrier coating.

One embodiment of the disclosure provides a method of fabricating a chamber component with a coating layer disposed on an interface layer with desired film properties. In one embodiment, a method of fabricating a coating material includes providing a base structure comprising an aluminum or silicon containing material, forming an interface layer on the base structure, wherein the interface layer comprises one or more elements from at least one of Ta, Al, Si, Mg, Y, or combinations thereof, and forming a coating layer on the interface layer, wherein the coating layer has a molecular structure of Si.sub.vY.sub.wMg.sub.xAl.sub.yO.sub.z. In another embodiment, a chamber component includes an interface layer disposed on a base structure, wherein the interface layer is selected from at least one of Ta, Al, Si, Mg, Y, or combinations thereof, and a coating layer disposed on the interface layer, wherein the coating layer has a molecular structure of Si.sub.vY.sub.wMg.sub.xAl.sub.yO.sub.z.

One embodiment of the disclosure provides a method of fabricating a chamber component with a coating layer disposed on an interface layer with desired film properties. In one embodiment, a method of fabricating a coating material includes providing a base structure comprising an aluminum or silicon containing material, forming an interface layer on the base structure, wherein the interface layer comprises one or more elements from at least one of Ta, Al, Si, Mg, Y, or combinations thereof, and forming a coating layer on the interface layer, wherein the coating layer has a molecular structure of Si.sub.vY.sub.wMg.sub.xAl.sub.yO.sub.z. In another embodiment, a chamber component includes an interface layer disposed on a base structure, wherein the interface layer is selected from at least one of Ta, Al, Si, Mg, Y, or combinations thereof, and a coating layer disposed on the interface layer, wherein the coating layer has a molecular structure of Si.sub.vY.sub.wMg.sub.xAl.sub.yO.sub.z.

A method for forming a sintered composition including providing a slurry precursor including a lithium-, sodium-, or magnesium-based compound; tape casting the slurry precursor to form a green tape; and sintering the green tape at a temperature in a range of 500° C. to 1350° C. for a time in a range of less than 60 min to form a sintered composition, such that the slurry precursor further includes a solvent and dispersant. The dispersant may include an amine compound, a carboxylic acid compound, or combinations, mixtures, or salts thereof.

A phosphor plate includes a plate-like composite including a base material and an α-type sialon phosphor present in the base material, in which, in an X-ray diffraction analysis pattern using a Cu-Kα ray, in a case in which peak intensity corresponding to the α-type sialon phosphor having a diffraction angle 2 θ in a range of 30.2° or more and 30.4° or less is defined as I.sub.α and peak intensity of a peak having a diffraction angle 2 θ in a range of 26.6° or more and 26.8° or less is defined as I.sub.β, I.sub.α, and I.sub.β satisfy 0<I.sub.β/I.sub.α≤10.

An iron oxide powder includes a porous structure having the diameter of from 0.3 μm to 2 μm, wherein the iron oxide powder has an aluminum content of from 10 mol % to 80 mol %.

An iron oxide powder includes a porous structure having the diameter of from 0.3 μm to 2 μm, wherein the iron oxide powder has an aluminum content of from 10 mol % to 80 mol %.

A method for producing a ceramic composite includes: preparing a sintered body in a plate form containing a fluorescent material having a composition of a rare earth aluminate, and aluminum oxide; and eluting the aluminum oxide from the sintered body by contacting the sintered body with a basic substance, for example, contained in an alkali aqueous solution, and the dissolution amount of the fluorescent material eluted from the sintered body in the step of eluting the aluminum oxide is 0.5% by mass or less based on an amount of the fluorescent material contained in the sintered body as 100% by mass.

A method for producing a ceramic composite includes: preparing a sintered body in a plate form containing a fluorescent material having a composition of a rare earth aluminate, and aluminum oxide; and eluting the aluminum oxide from the sintered body by contacting the sintered body with a basic substance, for example, contained in an alkali aqueous solution, and the dissolution amount of the fluorescent material eluted from the sintered body in the step of eluting the aluminum oxide is 0.5% by mass or less based on an amount of the fluorescent material contained in the sintered body as 100% by mass.