Ngk Insulators, Inc.

Kunikazu Hamaguchi

Toshiyuki Hamanaka

Seiichi Asami

Takashi Harada

Kazuhiko Kumazawa

Keiichiro Watanabe

Yoshiyuki Kasai

Wataru Kotani

A honeycomb structure in which the structure has a reinforced part having been loaded with a cordierite powder at least on one end surface of the frontal openings of the substrate of a honeycomb structure made of cordierite. This honeycomb structure does not decrease merits of a small pressure loss and the like as a thin-walled honeycomb structure, and is also excellent in abrasive resistance of the end surfaces of the frontal openings.

Cordierite honeycomb structure and manufacturing method thereof

A ceramic honeycomb structure is disclosed which includes a ceramic honeycomb body having a matrix of partition walls forming a multiplicity of cells extending in an axial direction of the honeycomb body. The radially outermost array of the cells are open to an outside of the honeycomb body in radial directions thereof, to provide a plurality of grooves formed in an outer periphery of the honeycomb body to extend in the axial direction. The honeycomb structure further includes an outer coating which fills at least the grooves to cover the outer periphery of the ceramic honeycomb body, so as to provide an outer surface of the honeycomb structure. Also disclosed are a process of producing such a honeycomb structure, and a coating material used for forming the outer coating as described above.

Ceramic honeycomb structure with grooves and outer coating, process of

A method of producing a porous ceramic filter, using a cordierite precursor or starting composition including a talc powder component and a silica powder component, such that particles of the talc powder component and the silica powder component whose size is not less than 150 .mu.m constitute not more than 3% by weight of the starting composition, while particles of the talc and silica powder components whose size is not more than 45 .mu.m constitute not more than 25% by weight of the starting composition. A green body for the porous ceramic honeycomb filter formed of this starting composition is fired to react the starting composition to form cordierite and produce the desired porous ceramic honeycomb filter.

Method of producing porous ceramic filter, using cordierite composition

A porous ceramic honeycomb filter having a chemical composition consisting of, as main components, 42-56 wt % SiO.sub.2, 30-45 wt % Al.sub.2 O.sub.3, and 12-16 wt % MgO and containing cordierite as a main component of a crystalline phase. The porous ceramic honeycomb filter has a porosity of at least 40% and not greater than 55%. The volume of pores having a diameter not larger than 2 .mu.m in the filter is not larger than 0.015 cc/g to thereby improve the collecting time with low pressure loss and high collecting efficiency.

Porous ceramic honeycomb filter and method of producing the same

Cordierite honeycomb structural bodies having coefficients of thermal expansion of not more than 1.0x10.sup.-6, an improved thermal shock resistance, a very small leakage amount and an improved heat exchanging efficiency are provided by using very fine particles of kaolin and talc to restrict a total pore volume of a given pore diameter to a given range. The cordierite honeycomb structural bodies are useful in broader fields than conventional ones.

Method of producing a cordierite honeycomb structural body

A cordierite honeycomb structural body to be used as a catalyst carrier, having excellent heat resistance, thermal shock resistance and coatability with a high specific surface area material and a catalyst is disclosed, which have a chemical composition consisting mainly of 42-56% by weight SiO.sub.2, 30-45% by weight of Al.sub.2 O.sub.3 and 12-16% by weight of MgO, having a crystal phase consisting mainly of cordierite, and having coefficients of thermal expansion of not higher than 0.3.times.10.sup.-6 /.degree.C. in the flow-passage direction of the honeycomb structure and not higher than 0.5.times.10.sup.-6 /.degree.C. in a direction perpendicular to the flow-passage of the honeycomb structure within the temperature range of 40.degree.-800.degree. C. A cordierite honeycomb-structural body, wherein a distribution of diameters of pores, relative to a total volume of pores having a diameter of 0.5-5 .mu.m is not less than 40% and the total volume of pores having a diameter of not smaller than 10 .mu.m is not more than 30% based on the total pore volume in the body. The body has excellent coatability and thermal shock resistance after coating.

Cordierite honeycomb-structural body and a method for producing the same

Cordierite honeycomb structural bodies having excellent coatability for a material of high specific surface area and a catalyst thereon and low thermal expansion are disclosed. The cordierite honeycomb structural body as a chemical composition essentially consisting of from 42 to 56% of SiO.sub.2, from 30 to 45% of Al.sub.2 O.sub.3, and from 12 to 16% of MgO in terms of weight and contains cordierite as a main component of a crystalline phase. Porosity of the cordierite honeycomb structural body is from over 30% to not more than 42%. The total volume of pores having a diameter of from 0.5 to 5 .mu.m and the total volume of pores having a diameter of not less than 10 .mu.m are not less than 70% and not more than 10% of the total pore volume of the honeycomb structural body, respectively.

Growing community of inventors

Nagoya, Japan

Kunikazu Hamaguchi