Ngk Insulators, Inc.

Shinzo Hayashi

Sugio Miyazawa

Masaru Doi

Yukio Miyairi

Masaaki Masuda

Sadaaki Hirai

Yoshifumi Takagi

A exhaust gas mixing apparatus includes an outer cylinder being configured to an insulating ceramic; fins being configured to an insulating ceramic, the fins being provided on an inner side of the outer cylinder; and an electric heating portion embedded in at least a part of the outer cylinder and/or the fins.

Exhaust gas mixing apparatus, exhaust gas purifier and exhaust gas purification method

The clay extruder includes a drumhaving a screwhaving a rotary shaft, a spiral rotary bladefor feeding the clay under pressure while kneading the clay fed into the screw, a pressure raising portionto feed the clay under pressure while kneading the clay, and a rectifying portionprovided on the side of an extrusion portin the drumto rectify the clay into a columnar shape. The rectifying portionhas a rectifying rotary bladewhose intervals being longer than that of the rotary blade; an angle formed between the face on the side of the extrusion port in a sectional shape of the rectifying rotary blade cut along the central line of the rotary shaftand the central line gradually decreases, as the rectifying rotary blade comes close to the extrusion port.

Clay extruder

A slurry for molding an article is provided wherein a source powder including at least one of a ceramic powder and a metal powder is dispersed, introduced into a forming mold, cured in the forming mold to form the molded article, and at least a part of the forming mold is degraded or dissolved in releasing the molded article from the forming mold. The major components of the slurry include the source powder, a dispersion medium and a gellifying agent, wherein the dispersion medium and the gellifying agent each contain an organic compound having a reactive functional group such that the slurry is cured by a reaction between the organic compound in the dispersion medium and the organic compound in the gellifying agent.

Core for molding hollow ceramic molded body and light emitting container

Method of manufacturing molded body, slurry for molding, core for molding, method of manufacturing core for molding, hollow ceramic molded body, and light emitting container

A method for producing a powder-molded body is provided, including the steps of casting a slurry containing a powder of at least one of a ceramic and a metal, and organic dispersion medium, and a gelling agent into a mold, and solidifying the slurry by gelling the slurry to obtain a molded body. The slurry is solidified by chemically bonding an organic dispersion medium having reactive functional groups and a gelling agent. The method is capable of improving gelling (solidification) efficiency and obtaining a molded body having a high density, a small firing shrinkage, and high shape precision, and which hardly experiences cracks during drying and firing.

Production of powder-molded body

A method for forming molded articles in any shape from ceramic, glass, or metal powders which comprises: preparing a slurry by dispersing more than one powder selected from a group consisting of ceramic, glass, and metal materials in a dispersing medium using a dispersing agent, and curing by adding a reactive substance that reacts with the dispersing agent to make the dispersibility of the dispersing agent disappear or lower.

Method for molding an article from powder

The present invention includes a method for freeze molding, comprising the steps of: mixing poly(vinyl alcohol) or a modified additive thereof with a material slurry to obtain a mixture; pouring the mixture into a molding die; and subjecting the mixture in a molding die to at least one cycle of cooling and heating so as to obtain a compact. A compact obtained in this method is free from melting and can maintain its configuration even if the compact is kept at a temperature of freezing point or higher. Further, since the method does not require vacuum drying, the compact can easily be dried.

Method for freeze molding

A forming process utilizing liquid absorption by a liquid-absorbing substance, includes preparing a liquid mixture containing at least one substance dispersible or soluble in the liquid mixture, a liquid capable of dispersing or dissolving the at least one substance, and a liquid-absorbing substance capable of absorbing the liquid by itself or when modified, and placing the liquid mixture in a mold and allowing the substance to absorb the liquid to obtain a formed material. In the forming process, the moldability is not influenced by the particle shape, particle diameter or particle size distribution of the at least one substance dispersible or soluble in the liquid, and the formed material obtained by said process has no internal strain and is homogeneous and elastic.

Growing community of inventors

Obu, Japan

Shinzo Hayashi