Ngk Insulators, Inc.

Shigeru Mochida

Masaru Kojima

Toshiyuki Hamanaka

Shunichi Yamada

Jun Kitagawa

Toshihiko Hijikata

Koichi Ikeshima

Takayuki Ogasawara

A ceramic honeycomb body has a plurality of through holes defined by partition walls so as to be separated from each other, and fins are integrally formed with selected partition walls so as to extend into the through holes surrounded by such selected partition walls, whereby the cross-sectional area of the through hole is selectively reduced by the fins thus provided.

Ceramic honeycomb body

A ceramic material for a honeycomb structure is formed from a mixture of raw materials comprising, per 100 parts by weight of the mixture, 20 to 80 parts by weight of cordierite powder and 20 to 80 parts by weight of powder having a crystalline phase consisting mainly of a solid solution of SiO.sub.2 --Al.sub.2 O.sub.3 --Fe.sub.2 O.sub.3 --TiO.sub.2 --MgO. The mixture consists essentially of 15.7 to 44.0% by weight of SiO.sub.2, 29.8 to 41.0% by weight of Al.sub.2 O.sub.3, 0.9 to 8.3% by weight of Fe.sub.2 O.sub.3, 7.0 to 35.9% by weight of TiO.sub.2 and 4.9 to 16.1% by weight of MgO.

Ceramic material for a honeycomb structure

A ceramic material for a honeycomb structure is prepared from a mixture of raw materials comprising per 100 parts by weight of the mixture 40 to 90 parts by weight of cordierite powder and 10 to 60 parts by weight of crystalline glass powder having a crystalline phase consisting mainly of a solid solution of .beta.-spodumene. The mixture consists essentially of 51.5 to 64.4% by weight of siO.sub.2, 24.8 to 33.7% by weight of Al.sub.2 O.sub.3, 5.5 to 12.4% by weight of MgO and 0.4 to 2.7% by weight of Li.sub.2 O. It may further contain up to 5.1% by weight of TiO.sub.2 and up to 1.8% by weight of ZrO.sub.2.

A heat resistant and thermal shock resistant ceramic honeycomb catalytic converter for purifying automotive exhaust gas and the like is constructed by arranging at least one ceramic honeycomb structural body, having a dimension of

Ceramic honeycomb catalytic converters having high thermal shock

This invention discloses ceramic honeycomb structural bodies having high thermal shock resistance and mechanical strength in which partition walls forming numerous parallel channels of the honeycomb structural bodies and/or connecting portions of the partition walls are constructed so as to have flexibility. The flexibility allows thermal stress generated in the honeycomb structural bodies to be absorbed. The bodies are characterized in that a given area of outer circumferential annular portion of said ceramic honeycomb structural bodies has a structure having a higher rigidity than the inner portion.

Ceramic honeycomb structural bodies

A ceramic honeycomb structural body to be used in an automobile monolith catalyst converter in which the ceramic honeycomb structural body having numerous parallel channels are clamped by annular supporting members perpendicular to axis of said channels has such a structure that end surfaces of the ceramic honeycomb structural body are more strongly clamped at an inner circumferential portion of the above described annular supporting members than at the outer circumferential portion of said annular supporting members. Such a ceramic honeycomb structural body is stably held in the catalyst converter without forming break at the peripheral portion of the end surface of the honeycomb structural body.

Ceramic honeycomb structural body

A ceramic honeycomb filter consisting of a porous ceramic honeycomb structural body having a large number of channels extending therethrough, wherein given channels at one of the opening end surfaces of the honeycomb structural body have sealing portions formed by bending and bonding thin partition walls forming the opening end portion of the channels, and the remaining channels have sealing portions formed by bending and bonding thin partition walls forming another opening end portion of the channels, can be produced in a simple manner and is excellent in durability and mass-productivity.

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Kasugai, Japan

Shigeru Mochida