Disclosed herein is a dual density disc comprising a dense outer tube comprising a metal oxide having a purity of greater than 92%; and a porous core comprising a metal oxide of a lower density than a density of the dense outer tube; wherein the porous core has a metal oxide purity of greater than 99%; where the dense outer tube has an inner tapered surface.

A ceramic vaporization core includes: a porous body; and a heating body disposed on the porous body. The porous body includes at least one porous ceramic layer doped with a hydroxyl group-containing matrix. In an embodiment, the porous ceramic layer doped with the hydroxyl group-containing matrix includes components in parts by weight as follows: 35 to 55 parts by weight of a ceramic powder doped with a hydroxyl group compound; and 25 to 45 parts by weight of a pore-forming agent.

A particulate filter and method of manufacture. The particulate filter includes intersecting walls that define longitudinally extending channels The intersecting walls comprise a porous ceramic material having a bare microstructure that comprises an interconnected network of porous spheroidal ceramic beads that has an open intrabead porosity within the beads and an interbead porosity defined by interstices between the beads. Catalyst particles are deposited at least partially within the intrabead porosity within the interbead porosity. The bare microstructure has a bimodal pore size distribution in which an intrabead median pore size of the intrabead porosity is less than an interbead median pore size of the interbead porosity. The filter has a trimodal pore size distribution comprising a first peak corresponding to the interbead porosity, a second peak corresponding to the intrabead porosity, and a third peak corresponding to the intrabead porosity as blocked by the catalyst particles.

A particulate filter and method of manufacture. The particulate filter includes intersecting walls that define longitudinally extending channels The intersecting walls comprise a porous ceramic material having a bare microstructure that comprises an interconnected network of porous spheroidal ceramic beads that has an open intrabead porosity within the beads and an interbead porosity defined by interstices between the beads. Catalyst particles are deposited at least partially within the intrabead porosity within the interbead porosity. The bare microstructure has a bimodal pore size distribution in which an intrabead median pore size of the intrabead porosity is less than an interbead median pore size of the interbead porosity. The filter has a trimodal pore size distribution comprising a first peak corresponding to the interbead porosity, a second peak corresponding to the intrabead porosity, and a third peak corresponding to the intrabead porosity as blocked by the catalyst particles.

A porous ceramic structure includes one sheet, and a plurality of porous ceramic particles bonded on the sheet. A gap d formed between adjacent ones of the porous ceramic particles is 10˜80 μm.

A porous ceramic structure includes one sheet, and a plurality of porous ceramic particles bonded on the sheet. A gap d formed between adjacent ones of the porous ceramic particles is 10˜80 μm.

A porous ceramic structure includes one sheet, and a porous ceramic aggregate bonded on the sheet. The porous ceramic aggregate includes a plurality of porous ceramic particles.

A porous ceramic structure includes one sheet, and a porous ceramic aggregate bonded on the sheet. The porous ceramic aggregate includes a plurality of porous ceramic particles.

The honeycomb structure includes a honeycomb structure body and a pair of electrode members disposed on a side surface of the honeycomb structure body, each of the pair of electrode members is shaped in the form of a band extending in a cell extending direction, and in a cross section perpendicular to the extending direction of cells, one electrode member is disposed on a side opposite to the other electrode member via a center of the honeycomb structure body, one or more slits opened in the side surface are formed in the honeycomb structure body, the honeycomb structure body has a charging material charged into the at least one slit, the charging material contains aggregates and a neck material, and a ratio (α2/α1) of a thermal expansion coefficient α2 of the charging material to a thermal expansion coefficient α1 of the honeycomb structure body is from 0.6 to 1.5.

The honeycomb structure includes a honeycomb structure body and a pair of electrode members disposed on a side surface of the honeycomb structure body, each of the pair of electrode members is shaped in the form of a band extending in a cell extending direction, and in a cross section perpendicular to the extending direction of cells, one electrode member is disposed on a side opposite to the other electrode member via a center of the honeycomb structure body, one or more slits opened in the side surface are formed in the honeycomb structure body, the honeycomb structure body has a charging material charged into the at least one slit, the charging material contains aggregates and a neck material, and a ratio (α2/α1) of a thermal expansion coefficient α2 of the charging material to a thermal expansion coefficient α1 of the honeycomb structure body is from 0.6 to 1.5.