Ngk Insulators, Inc.

Yoshinori Yamamoto

Takashi Harada

Naomi Noda

Yukihisa Wada

Shuichi Ichikawa

Aiko Otsuka

Yumi Toda

There is disclosed a method of manufacturing a porous ceramic structure, comprising the steps of: preparing a formed structure using a ceramic material containing a pore former and a binder; and drying and firing the formed structure, wherein the process of firing the formed structure comprises the steps of: holding a firing atmosphere temperature in a temperature range of &#x2212;50 to +10&#xb0; C. with respect to a combustion start temperature of the binder from the time when the temperature reaches the combustion start temperature of the binder contained in the porous ceramic structure to be fired to the time when the binder is burnt out. According to this method, ceramic structures having not only a low porosity but also a high porosity can be manufactured without generating any crack during the firing.

Method of manufacturing porous ceramic body

A honeycomb structurehas a large number of through-holesdivided by partition wallsand extending in the axial direction, characterized in that the honeycomb structure contains a Si phase having a lattice constant controlled at 0.54302 to 0.54311 nm at room temperature. A process for producing the honeycomb structure, includes a firing step of firing a precursor of honeycomb structure, wherein the precursor contains a Si phase and the firing step is conducted using a furnace material free from any boron-containing compound. A process for producing the honeycomb structure, includes a firing step of firing a precursor of honeycomb structure, wherein a reduction percentage of Si content in Si phase after firing step relative to Si content in Si phase before firing step is suppressed at 10% by mass or less. Having an improved thermal conductivity, the honeycomb structure is superior in thermal shock resistance.

Si-containing honeycomb structure and process for production thereof

A honeycomb structure having, in the axial direction, a number of through-channels separated by partition walls, which honeycomb structure contains refractory particles and a vitreous component and is porous. Although the honeycomb structure contains refractory particles such as silicon carbide particles or the like, it can be produced at a relatively low firing temperature; therefore, the honeycomb structure has a low production cost and a high yield and can be provided at a low price.

Honeycomb structure and process for production thereof

A ceramic structure obtained by combining a plurality of sintered ceramic material segments ( ) having a thermal expansion coefficient of 3.0&times;10 /&deg; C. or more and integrating them, in which ceramic structure thermal impact-relieving zones ( ) capable of releasing the thermal impact applied are provided between the segments ( ) and the widths of the thermal impact-relieving zones ( ) in the sectional direction of the ceramic structure are various. This ceramic structure is capable of sufficiently release the thermal impact applied, without significantly reducing the effective sectional area of the structure or the overall strength of the structure, and can have the universality capable of coping with various applications and various materials.

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Nishikamo-gun, Japan

Yoshinori Yamamoto