Ngk Insulators, Inc.

Hisayoshi Nonaka

Kenji Yajima

Toshihiro Tomita

Toshihiko Honda

Tadashi Otagiri

Tetsuya Uchikawa

Akimasa Ichikawa

Tomio Suzuki

Kunio Nakayama

Yoshitaka Tabuchi

There is provided a DDR-type zeolite powder composed of fine particles and exhibits a particle size distribution where the majority of the particles have particle diameters converging in the vicinity of the mean particle diameter, and a process for the production of the same. Specifically provided is a process for the production of a DDR-type zeolite powder, which comprises a step of heat-treating a raw material solution at 100 to 180&#xb0; C., and thereby growing crystals until the mean particle diameter reaches to a level of 0.1 &#x3bc;m or more and below 2.5 &#x3bc;m.

DDR-type zeolite powder, and process for the production of DDR-type zeolite powder

A method is provided for producing a DDR type zeolite membrane, including a membrane formation step of immersing a porous substrate having a DDR type zeolite seed crystal adhered thereon, in a raw material solution containing 1-adamantaneamine, silica (SiO) and water, and conducting a hydrothermal synthesis of DDR type zeolite to form a 1-adamantaneamine-containing DDR type zeolite membrane on the porous substrate to produce a precursor of DDR type zeolite membrane-containing body, and a burning step of heating the precursor at 400&#xb0; C. or above and at 550&#xb0; C. or below to burn and remove the 1-adamantaneamine contained in the DDR type zeolite membrane.

Method for production of DDR type zeolite membrane

A method for manufacturing a DDR zeolite membrane element including the steps of: immersing a porous substrate in a raw material solution, forming a DDR zeolite membrane containing 1-adamanthanamine on a surface of the porous substrate by subjecting a DDR zeolite to hydrothermal synthesis in the presence of DDR zeolite seed crystals, applying a glass paste onto the surface of the porous substrate so as to contact the membrane, and heating the membrane at 500 to 800&#xb0; C., thereby burning away the 1-adamanthanamine contained in the membrane and melting the glass paste to form a membrane-like glass seal contacting the membrane on the surface of the porous substrate. The method for manufacturing a DDR zeolite membrane element can inhibit the permeation of the DDR zeolite membrane from being hindered in a contact portion between the membrane and the glass seal and inhibit poor seal of the glass seal.

Method for manufacturing a structure provided with DDR zeolite membrane

A separation membrane complex where a carbon membrane is formed directly on a porous body (surface layer) and an intermediate layer has a thickness of 10 to 100 &#x3bc;m can be used as a filter having improved flux and selectivity in comparison with a conventional one.

Separation membrane complex, and method for manufacturing the separation membrane complex

A porous substrate with a seed crystal-containing layer for manufacturing a zeolite membrane includes: a ceramic porous substrate, and a seed crystal-containing layer containing a zeolite powder to function as a seed crystal for forming a zeolite membrane and a ceramic powder and being loaded on a surface of the ceramic porous substrate and fired to fix the seed crystal-containing layer on the porous substrate. The porous substrate with a seed crystal-containing layer used for manufacturing a zeolite membrane inhibits a defect such as a crack from being generated in the zeolite layer upon manufacture or use by manufacturing a zeolite membrane by the use of the substrate which then can be subjected to air-spraying, washing, and processing for the purpose of removing a foreign substance, etc., prior to hydrothermal synthesis.

Porous structure with seed crystal-containing layer for manufacturing zeolite membrane, zeolite membrane, and method for manufacturing zeolite membrane

There is provided a substrate material for wiring having an excellent thermal resistance, and durability and reliability under severe conditions, characterized in that said substrate material comprises an insulator whose major component is composed of epoxy resin and ceramics having a thermal expansion coefficient of 2 ppm/&deg; C. or less, and that the thermal expansion coefficient is isotropic.

Substrate material for wiring and substrate material for printed circuit using the same

Granulated powder for molding produced by granulating material powder, whose variation factor (the standard deviation of strength/average strength) of the compressive strength of each granular particles composing granulated powder is 0.3 or less. By using granulated powder for molding of the present invention, sintered bodies with preferred properties, in particular with high strength can be produced stably.

Granulated powder for producing silicon nitride sintered body

A high-strength silicon nitride sintered body wherein the halogen element content in the silicon nitride sintered body is 200 ppm or higher. The silicon nitride sintered bodies have high strength at near room temperature. Therefore, such sintered bodies may be used favorably as a structural material for mechanical parts and the like, such as sliding members, whose strength at near room temperature is important.

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Nagoya, Japan

Hisayoshi Nonaka