The present disclosure relates to a method for producing an acoustic attenuation panel having two outer skins made from a composite material with a ceramic matrix containing a fibrous reinforcement. The skins are assembled on each side of a central honeycomb core having walls forming acoustic cavities produced by at least partial electrochemical conversion of aluminum into aluminum oxide. The method includes inserting a fugitive filler material into the acoustic cavities, leaving an annular space free in each cavity, on each side against the skin, extending around the cavity, and a step of sintering the composite material, in which the fugitive material is removed and the spaces around the cavities are filled with the composite material.

The disclosure relates to sealant compositions for forming hermetic seals, methods of use, and hermetically sealed products. The sealant compositions comprise a first inorganic oxide chosen from at least one of MgSiO.sub.3, MgO, MgTiO.sub.3, CaO, and CaSiO.sub.3, a second inorganic oxide chosen from SiO.sub.2, at least one solvent, and optionally at least one organic resin binder.

A sintered ceramic ball is described that includes an incomplete ceramic ball portion with a wall with an exterior surface, the wall having an interior space located radially interior of an inner surface of the wall. The incomplete ceramic ball portion also has an exterior surface, the exterior surface having an exterior surface area. The sintered ceramic ball further includes a ceramic plug joined with the incomplete ceramic ball portion to form a continuous exterior ball surface. The ceramic plug includes an exterior plug surface and a plug wall. The plug surface includes an exterior plug surface area, wherein the exterior plug surface area is between about 5% to 49.9% of the sum of the exterior surface area of the incomplete ceramic ball portion and the exterior plug surface area. The interior space of the sintered ceramic ball is sealed within the wall and the plug wall.

A method for producing a member for a semiconductor manufacturing apparatus 10 includes (a) a step of providing an electrostatic chuck 20, a supporting substrate 30, and a metal bonding material 401, the electrostatic chuck being made of a ceramic and having a form of a flat plate, the supporting substrate including a composite material having a difference in linear thermal expansion coefficient at 40 to 570 C. from the ceramic of 0.210.sup.6/K or less in absolute value, and (b) a step of interposing the metal bonding material 401 between a concave face 32 of the supporting substrate 30 and a face 23 of the electrostatic chuck 20 opposite to a wafer mounting face 22, and thermocompression bonding the supporting substrate 30 and the electrostatic chuck 20 at a predetermined temperature to deform the electrostatic chuck 20 to the shape of the concave face 32.

A ceramic structural body includes a substrate that is composed of a ceramic(s), a hole that is opened on a surface of the substrate, and a seal material that is positioned at an opening portion of the hole.

A Ceramic Matrix Composite (CMC) airfoil segment for a gas turbine engine includes a box-shape fiber geometry which defines a rectilinear pressure side bond line and a rectilinear suction side bond line.

One aspect of the present disclosure includes a turbine vane assembly comprising a vane made from ceramic matrix composite material having an outer wall extending between a leading edge and a trailing edge and between a first end and an opposing second end; an endwall made at least partially from a ceramic matrix composite material configured to engage the first end of the vane; and a retaining region including corresponding bi-cast grooves formed adjacent the first end of the vane and a receiving aperture formed in the endwall; wherein a bond is formed in the retaining region to join the vane and endwall together.

A porous ceramic laminate, which can reduce pressure loss of a fluid, includes a first porous layer and a second porous layer. The second porous layer is laminated on, in contact with or via air, the first porous layer. A part of the second porous layer is laminated on, in contact with, the first porous layer. Each of the first porous layer and the second porous layer contains a metal oxide. A ratio Da/Db of an average pore diameter Da of the first porous layer relative to an average pore diameter Db of the second porous layer is 10 or more. A proportion of a portion in which a distance between the first porous layer and the second porous layer is smaller than 1 m is 70% or less.

A surface-coated cutting tool according to the present invention includes a coating. The coating has an -Al.sub.2O.sub.3 layer. The -Al.sub.2O.sub.3 layer includes a lower layer portion and an upper layer portion. When respective crystal orientations of crystal grains of -Al.sub.2O.sub.3 are specified by performing EBSD analyses with an FE-SEM on a cross-section obtained when the -Al.sub.2O.sub.3 layer is cut along a plane including a normal line of a surface of the -Al.sub.2O.sub.3 layer and a color map is prepared based on the crystal orientations, in the color map, an area in the upper layer portion occupied by the crystal grains of which normal direction of a (001) plane is within 10 with respect to a normal direction of the surface of the -Al.sub.2O.sub.3 layer is equal to or more than 90%, and such an area in the lower layer portion is equal to or less than 50%.

A method for the joining of ceramic pieces with a hermetically sealed joint comprising brazing a layer of joining material between the two pieces. The wetting and flow of the joining material is controlled by the selection of the joining material, the joining temperature, the joining atmosphere, and other factors. The ceramic pieces may be aluminum nitride and the pieces may be brazed with an aluminum alloy under controlled atmosphere. The joint material is adapted to later withstand both the environments within a process chamber during substrate processing, and the oxygenated atmosphere which may be seen within the shaft of a heater or electrostatic chuck.