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

In an aspect, an M-type ferrite comprises an element Me comprising at least one of Ba, Sr, or Pb; an element Me comprising at least one of Ti, Zr, Ru, or Ir; and an element Me comprising at least one of In or Sc. In another aspect, a method of making the M-type ferrite can comprise milling ferrite precursor compounds comprising oxides of at least Co, Fe, Me, Me, and Me to form an oxide mixture; wherein Me comprises at least one of Ba, Sr, or Pb; Me is at least one of Ti, Zr, Ru, or Ir; and Me is at least one of In or Sc; and calcining the oxide mixture in an oxygen or air atmosphere to form the ferrite.

A dielectric ceramic composition includes main phase grains and a grain boundary between the main phase grains. The main phase grains include a perovskite compound as a main component. The perovskite compound includes at least Ca and Sr as A-site elements and at least Zr and Ti as B-site elements. The dielectric ceramic composition further includes an oxide of at least one additional element. / is 3.0 or more and 6.0 or less, where (unit: parts by mol) denotes a content of the at least one additional element of the dielectric ceramic composition with respect to 100 parts by mol B-site elements, and (unit: parts by mol) denotes a content of the at least one additional element of the grain boundary with respect to 100 parts by mol B-site elements.

A dielectric ceramic composition includes main phase grains and a grain boundary. The main phase grains include a perovskite compound as a main component. The perovskite compound includes at least Ca, Sr, Zr, and Ti. The dielectric ceramic composition further includes an oxide of at least one additional element. The dielectric ceramic composition has a total content of Ti, Mn, and Cr of 7.0 parts by mol or less. The main phase grains include a specific main phase grain. The specific main phase grain includes a first minute region having a high total content of Mn and Cr and a second minute region having a low total content of Mn and Cr. The first minute region is located in a peripheral portion of the specific main phase grain. The second minute region is located in a central portion of the specific main phase grain.

Disclosed is a ceramic sintered body comprising magnesium aluminate spinel of composition MgAl.sub.2O.sub.4 having from 90 to 100% by volume of a cubic crystallographic structure and a density of from 3.47 to 3.58 g/cc, wherein the ceramic sintered body is free of sintering aids. A method of making the ceramic sintered body comprising spinel is also disclosed.

The present invention relates to a method of producing a SiCSi composite component. The method includes preparing a first molded body containing SiC particles by a 3D printing method, wherein the first molded body has a first average pore diameter M.sub.1; forming a second molded body, in which the first molded body and a dispersion containing carbon particles are brought into contact so that the pores are impregnated with the carbon particles, wherein the carbon particles have a secondary particle having an average particle diameter M.sub.2, and the carbon particles satisfy the following formula:
M.sub.2M.sub.1/10; and forming a SiCSi composite component by carrying out that the second molded body is impregnated with a metallic si and is reactively sintered; wherein the content of Si is in the range of 5% by mass to 40% by mass in the SiCSi composite component.

A ceramic composite sealing ring, high-pressure compressor of a gas turbine engine assembly including a ceramic composite sealing ring and method for making a high-pressure compressor of a gas turbine engine assembly. The ceramic composite material is composed of unidirectional aligned fibers which may be encapsulated by a ceramic matrix. The piston seal ring of the high-pressure compressor of a gas turbine engine assembly is positioned at the interface of the tie shaft and the integrated blade rotor.

An antiballistic armor-plating component, includes a ceramic body made of a material comprising, as percentages by volume, between 35% and 55% of silicon carbide, between 20% and 50% of boron carbide, between 15% and 35% of a metallic silicon phase or of a metallic phase including silicon.

An electrolyte sheet for solid oxide fuel cells includes a ceramic plate body containing a cubic zirconia sintered material, wherein, with the ceramic plate body being defined to have nine portions including an outer peripheral portion and a central portion, ceramic grains in each of the nine portions have a median size D.sub.50 of 1.0 m to 4.0 m, and a maximum median size D.sub.50 of the ceramic grains among the nine portions is 1.0 to 1.3 times a minimum median size D.sub.50 of the ceramic grains among the nine portions.

A sintered body containing polycrystalline grains of a metal oxynitride containing at least two metal elements, wherein Ba and at least one metal element of a crystal phase of the sintered body are contained in a triple point that is not a void between the polycrystalline grains. A method for producing the sintered body includes sintering a mixture of at least a metal oxynitride as a main component and a sintering aid containing cyanamide in an atmosphere containing nitrogen or a rare gas or in a reduced-pressure atmosphere of 10 Pa or less while applying a mechanical pressure with a retention time at a maximum heating temperature during the sintering set to 1 minute to 10 minutes.