A ceramic filter is provided with a porous substrate 3 “made of ceramic and having partition walls 1 separating and forming a plurality of cells 2 extending from one end face 11 to the other end face 12”, a separation membrane 21 “made of ceramic and disposed on wall surfaces of the cells 2”, and glass seals 31 disposed on the one end face 11 and on the other end face 12 “so as not to cover openings of the cells 2”. Ceramic particles having a thermal expansion coefficient of 90 to 110% of that of glass contained in the glass seals 31 are dispersed in the glass seals 31. There is provided a ceramic filter usable for a long period of time in high temperature conditions.

A thermistor material and a method for preparing a thermistor material are provided. The thermistor material is prepared by mixing and heating a mixture containing BaTiO.sub.3, B.sub.2O.sub.3, SiO.sub.2, Li.sub.2O, P.sub.2O.sub.5, Cs.sub.2O, Nd.sub.2O.sub.3, Al.sub.2O.sub.3 and TiO.sub.2.

A sintered body of the present invention contains yttrium oxyfluoride. The yttrium oxyfluoride is preferably YOF and/or Y.sub.5O.sub.4F.sub.7. The sintered body of the present invention preferably contains 50% by mass or more of yttrium oxyfluoride. The sintered body of the present invention has a relative density of preferably 70% or more and an open porosity of preferably 10% or less. Furthermore, the sintered body of the present invention has a three-point bending strength of preferably 10 MPa or more and 300 MPa or less.

A ceramic honeycomb structure having pluralities of flow paths partitioned by porous cell walls, (a) the cell walls having porosity of 50-63%; and (b) in a pore diameter distribution in the cell walls measured by mercury porosimetry, (i) pore diameters at cumulative pore volumes corresponding to particular percentages of the total pore volume being within specific ranges and having specific relationships; (ii) the difference between a logarithm of the pore diameter at a cumulative pore volume corresponding to 20% of the total pore volume and a logarithm of the pore diameter at 80% being 0.39 or less; and (iii) the volume of pores of more than 100 μm being 0.03 cm.sup.3/g or less.

An aluminium oxide ceramic material containing the following components:

TABLE-US-00001 component wt.-% Al.sub.2O.sub.3  95.0 to 99.989 MgO 0.001 to 0.1 Eu, calculated as Eu.sub.2O.sub.3  0.01 to 1.0.

Disclosed herein is a method of: placing between a cooling element and an opposing surface a slurry of: a dielectric powder containing barium titanate, a dispersant, a binder, and water; maintaining the cooling element at a temperature below the opposing surface to cause the formation of ice platelets perpendicular to the surface of the cooling element and having the powder between the platelets; subliming the ice platelets to create voids; sintering the powder to form the dielectric material; and filling the voids with the polymeric material. The process can produce a composite having: a sintered dielectric material of barium titanate and platelets of a polymeric material embedded in the dielectric material. Each of the platelets is perpendicular to a surface of the composite.

The present invention relates to a method for preparing an electrode-supported electrochemical half-cell including a step consisting in subjecting a green electrode layer on which a precursor gel of the electrolyte or a precursor thereof is deposited to sintering at a temperature of less than or equal to 1350° C.

A ceramic honeycomb structure having pluralities of flow paths partitioned by porous cell walls; (a) the cell walls having porosity of 50-60%; and (b) in a pore diameter distribution in the cell walls measured by mercury porosimetry, (i) pore diameters at cumulative pore volumes corresponding to particular percentages of the total pore volume being within specific ranges and having specific relationships; and (ii) the difference between a logarithm of the pore diameter at a cumulative pore volume corresponding to 20% of the total pore volume and a logarithm of the pore diameter at 80% being 0.39 or less, and its production method.

Provided are a sintered material having high corrosion resistance, a method of manufacturing the sintered material, a member for a semiconductor manufacturing apparatus, a method of manufacturing a member for a semiconductor manufacturing apparatus, a semiconductor manufacturing apparatus, and a method of manufacturing a semiconductor manufacturing apparatus. The sintered material according to an embodiment includes 50 mass% or more of yttrium oxyfluoride, has a relative density of 97.0% or more, and has a Vickers hardness of 5.0 GPa or more. The method of manufacturing a sintered material according to an embodiment includes forming a molded body including yttrium oxyfluoride powder having a particle size of 0.3 .Math.m or less, and sintering the molded body under an atmospheric pressure at a temperature of 800° C. or less.

A method for the assembly of a metal part and a ceramic part, including the following steps: supplying a solid ceramic part of the alumina type; supplying a solid metal part, the metal being selected from platinum and tantalum, or an alloy including a majority of one of these metals; depositing at least one layer, called interface layer, on at least one of the solid parts, the interface layer containing magnesium oxide; bringing into contact the solid metal part and the solid ceramic part such that the interface layer is located between the solid parts; and hot densification under pressure of the solid parts brought into contact, to create a close bond between the solid parts and form a spinel from the interface layer. An electrical device, such as a capacitive sensor having a sensitive part produced according to the present method, is also provided.