A sintered bead with the following crystal phases, in percentages by mass based on crystal phases: 25%zircon, or Z.sub.1, 94%; 4%stabilized zirconia+stabilized hafnia, or Z.sub.2, 61%; monoclinic zirconia+monoclinic hafnia, or Z.sub.350%; corundum57%; crystal phases other than Z.sub.1, Z.sub.2, Z.sub.3 and corundum<10%; the following chemical composition, in percentages by mass based on oxides: 33%ZrO.sub.2+HfO.sub.2, or Z.sub.483.4%; HfO.sub.22%; 10.6%SiO.sub.234.7%; Al.sub.2O.sub.350%; 0%Y.sub.2O.sub.3, or Z.sub.5; 0%CeO.sub.2, or Z.sub.6; 0.3%CeO.sub.2+Y.sub.2O.sub.319%, provided that (1) CeO.sub.2+3.76*Y.sub.2O.sub.30.128*Z, and (2) CeO.sub.2+1.3*Y.sub.2O.sub.30.318*Z, with Z=Z.sub.4+Z.sub.5+Z.sub.6(0.67*Z.sub.1*(Z.sub.4+Z.sub.5+Z.sub.6)/(0.67*Z.sub.1+Z.sub.2+Z.sub.3)); MgO5%; CaO2%; oxides other than ZrO.sub.2, HfO.sub.2, SiO.sub.2, Al.sub.2O.sub.3, MgO, CaO, CeO.sub.2 and Y.sub.2O.sub.3<5.0%.

A sintered bead with the following crystal phases, in percentages by mass based on crystal phases: 25%zircon, or Z.sub.1, 94%; 4%stabilized zirconia+stabilized hafnia, or Z.sub.2, 61%; monoclinic zirconia+monoclinic hafnia, or Z.sub.350%; corundum57%; crystal phases other than Z.sub.1, Z.sub.2, Z.sub.3 and corundum<10%; the following chemical composition, in percentages by mass based on oxides: 33%ZrO.sub.2+HfO.sub.2, or Z.sub.483.4%; HfO.sub.22%; 10.6%SiO.sub.234.7%; Al.sub.2O.sub.350%; 0%Y.sub.2O.sub.3, or Z.sub.5; 0%CeO.sub.2, or Z.sub.6; 0.3%CeO.sub.2+Y.sub.2O.sub.319%, provided that (1) CeO.sub.2+3.76*Y.sub.2O.sub.30.128*Z, and (2) CeO.sub.2+1.3*Y.sub.2O.sub.30.318*Z, with Z=Z.sub.4+Z.sub.5+Z.sub.6(0.67*Z.sub.1*(Z.sub.4+Z.sub.5+Z.sub.6)/(0.67*Z.sub.1+Z.sub.2+Z.sub.3)); MgO5%; CaO2%; oxides other than ZrO.sub.2, HfO.sub.2, SiO.sub.2, Al.sub.2O.sub.3, MgO, CaO, CeO.sub.2 and Y.sub.2O.sub.3<5.0%.

Disclosed is a ceramic sliding partner for a sliding bearing, said sliding partner being made at least in part, preferably entirely, of a ceramic foam. The ceramic sliding partner comprises at least one sliding surface on which a sliding partner can move, said sliding surface being made at least in part, preferably entirely, of a ceramic foam.

Disclosed is a fused grain having the following chemical composition, expressed in percentages by mass on the basis of the oxides: ZrO.sub.2+HfO.sub.2: 2% to 13%; elements other than ZrO.sub.2, HfO.sub.2, Y.sub.2O; and Al.sub.2O.sub.3: 2%. Y.sub.2O.sub.3+Al.sub.2O.sub.3: made up to 100%; with 0.0065Y.sub.2O;/(ZrO.sub.2+HfO.sub.2)0.1300.

Disclosed is a fused grain having the following chemical composition, expressed in percentages by mass on the basis of the oxides: ZrO.sub.2+HfO.sub.2: 2% to 13%; elements other than ZrO.sub.2, HfO.sub.2, Y.sub.2O; and Al.sub.2O.sub.3: 2%. Y.sub.2O.sub.3+Al.sub.2O.sub.3: made up to 100%; with 0.0065Y.sub.2O;/(ZrO.sub.2+HfO.sub.2)0.1300.

Fused tuckstone defining lower and upper surfaces. The lower surface includes a support surface to rest on metallic structure of a glass furnace, a tank surface intended to face an upper edge of a tank of the furnace, and a lower transition surface connecting the support and tank surfaces. The upper surface includes a superstructure surface to receive a side wall of a superstructure of the furnace and an upper transition surface connecting the superstructure and lower surfaces. At least a part of the lower transition surface has a crystal density of more than four times the crystal density at a depth of 4 centimeters below the lower transition surface, a crystal density being evaluated by the number of crystals having a surface area of more than 12 ?m.sup.2 per mm.sup.2 of surface after polishing, the crystal density at the depth being evaluated after cutting of the tuckstone.

A method of fabricating a turbine engine part, the method including fabricating an ingot out of ceramic material of eutectic composition by performing the Czochralski process including putting a seed of the ingot that is to be obtained into contact with a molten bath of a mixture of eutectic composition in order to initiate the formation of the ingot on the seed, the mixture including at least two ceramic compounds; drawing the ingot from the molten bath while imposing on the ingot that is being formed a drawing speed less than or equal to 10 mm/h together with rotation at a speed of rotation less than or equal to 50 rpm; and machining the ingot as fabricated in this way in order to obtain the turbine engine part.

A method of fabricating a turbine engine part, the method including fabricating an ingot out of ceramic material of eutectic composition by performing the Czochralski process including putting a seed of the ingot that is to be obtained into contact with a molten bath of a mixture of eutectic composition in order to initiate the formation of the ingot on the seed, the mixture including at least two ceramic compounds; drawing the ingot from the molten bath while imposing on the ingot that is being formed a drawing speed less than or equal to 10 mm/h together with rotation at a speed of rotation less than or equal to 50 rpm; and machining the ingot as fabricated in this way in order to obtain the turbine engine part.

The present invention relates to a saggar for firing an active material of a secondary battery, a method for manufacturing the saggar, and a method for firing the active material. The saggar for firing an active material of a secondary battery according to the present invention has a coating layer formed on a bottom surface or a wall surface thereof so as to collect carbon dioxide. By means of the coating layer, the concentration of the carbon dioxide in the saggar can be lowered by collecting the carbon dioxide that is a by-product resulting from a firing reaction, thereby enabling a reduction in the amount of remaining lithium in the active material. The saggar of the present invention provides the saggar for firing an active material of a secondary battery, wherein the saggar has at least one through hole in the bottom surface, or the bottom surface and wall surfaces thereof so as to communicate a gas.

The present invention relates to a saggar for firing an active material of a secondary battery, a method for manufacturing the saggar, and a method for firing the active material. The saggar for firing an active material of a secondary battery according to the present invention has a coating layer formed on a bottom surface or a wall surface thereof so as to collect carbon dioxide. By means of the coating layer, the concentration of the carbon dioxide in the saggar can be lowered by collecting the carbon dioxide that is a by-product resulting from a firing reaction, thereby enabling a reduction in the amount of remaining lithium in the active material. The saggar of the present invention provides the saggar for firing an active material of a secondary battery, wherein the saggar has at least one through hole in the bottom surface, or the bottom surface and wall surfaces thereof so as to communicate a gas.