Disclosed herein are methods for producing an ultra-dense and ultra-smooth ceramic coating. A method includes feeding a solution comprising a metal precursor into a plasma sprayer. The plasma sprayer generates a stream toward an article, forming a ceramic coating on the article upon contact.

A translucent sintered body having the following basic composition:
Ca.sub.(1−x)Yb.sub.xF.sub.(2+x), where 0.4≦x≦1.0,
or preferably
Ca.sub.(1−x−y)Yb.sub.xR.sub.yF.sub.(2+x+y), 0.4≦x≦1.0, 0≦y≦0.5 wherein R is at least one element selected from Ce, Pr, Sm, Eu and Y.

A translucent sintered body having the following basic composition:
Ca.sub.(1−x)Yb.sub.xF.sub.(2+x), where 0.4≦x≦1.0,
or preferably
Ca.sub.(1−x−y)Yb.sub.xR.sub.yF.sub.(2+x+y), 0.4≦x≦1.0, 0≦y≦0.5 wherein R is at least one element selected from Ce, Pr, Sm, Eu and Y.

A three-dimensional (3D) printing composition includes ceramic filaments comprising an additive having an aspect ratio of at least 2:1. 3D printed ceramic articles include the ceramic filaments.

A three-dimensional (3D) printing composition includes ceramic filaments comprising an additive having an aspect ratio of at least 2:1. 3D printed ceramic articles include the ceramic filaments.

Provided are a member for plasma processing device which has an excellent plasma resistance and improved adhesion strength of a film to a base material, and a plasma processing device provided with the same. A member for plasma processing device includes: a base material containing a first element which is a metal element or a metalloid element; a film containing a rare-earth element oxide, or a rare-earth element fluoride, or a rare-earth element oxyfluoride as a major constituent, the film being located on the base material; and an amorphous portion containing the first element, a rare earth element, and at least one of oxygen and fluorine, the amorphous portion being interposed between the base material and the film.

The present invention relates to a collection apparatus for collecting particulate matter generated due to friction between a rotor and a brake pad in a brake system of a transport facility, the collection apparatus including a first collector configured to surround a portion of an outer side surface of the rotor, an upper collector configured to surround a portion of an outer peripheral surface of the rotor, and a second collector configured to surround a portion of an inner side surface of the rotor, wherein the first collector and the second collector are made of porous ceramic foam. According to the present invention, particulate matter generated due to friction between a rotor and a brake pad in a brake system of a transport facility can be efficiently collected, and by reducing the amount of particulate matter generated when braking a transport facility, air pollution can be prevented.

The present invention relates to a collection apparatus for collecting particulate matter generated due to friction between a rotor and a brake pad in a brake system of a transport facility, the collection apparatus including a first collector configured to surround a portion of an outer side surface of the rotor, an upper collector configured to surround a portion of an outer peripheral surface of the rotor, and a second collector configured to surround a portion of an inner side surface of the rotor, wherein the first collector and the second collector are made of porous ceramic foam. According to the present invention, particulate matter generated due to friction between a rotor and a brake pad in a brake system of a transport facility can be efficiently collected, and by reducing the amount of particulate matter generated when braking a transport facility, air pollution can be prevented.

The present invention relates a coating powder comprising a rare earth oxyfluoride (Ln-O—F) and having: an average particle size (D.sub.50) of 0.1 to 10 μm, a pore volume of pores having a diameter of 10 μm or smaller of 0.1 to 0.5 cm.sup.3/g as measured by mercury intrusion porosimetry, and a ratio of the maximum peak intensity (S0) assigned to a rare earth oxide (Ln.sub.xO.sub.y) in the 2θ angle range of from 20° to 40° to the maximum peak intensity (S1) assigned to the rare earth oxyfluoride (Ln-O—F) in the same range, S0/S1, of 1.0 or smaller in powder X-ray diffractometry using Cu-Kα rays or Cu-Kα.sub.1 rays.

The present invention relates a coating powder comprising a rare earth oxyfluoride (Ln-O—F) and having: an average particle size (D.sub.50) of 0.1 to 10 μm, a pore volume of pores having a diameter of 10 μm or smaller of 0.1 to 0.5 cm.sup.3/g as measured by mercury intrusion porosimetry, and a ratio of the maximum peak intensity (S0) assigned to a rare earth oxide (Ln.sub.xO.sub.y) in the 2θ angle range of from 20° to 40° to the maximum peak intensity (S1) assigned to the rare earth oxyfluoride (Ln-O—F) in the same range, S0/S1, of 1.0 or smaller in powder X-ray diffractometry using Cu-Kα rays or Cu-Kα.sub.1 rays.