A honeycomb structure including a plurality of porous honeycomb block bodies bound via joining material layers A. Each of the porous honeycomb block bodies includes a plurality of porous honeycomb segments bound via joining material layers B, each of the porous honeycomb segment includes: partition walls that defines a plurality of cells to form flow paths for a fluid, each of cells extending from an inflow end face that is an end face on a fluid inflow side to an outflow end face that is an end face on a fluid outflow side; and an outer peripheral wall located at the outermost periphery. At least a part of the joining material layers A has higher toughness than that of the joining material layers B.

A honeycomb filter includes a pillar-shaped honeycomb structure having porous partition walls provided, surrounding a plurality of cells which serve as fluid through channels extending from an inflow end face to an outflow end face, and porous plugging portions provided either at the ends on the inflow end face or the outflow end face of the cells, wherein the plugging portions are composed of a porous material, the honeycomb structure has a central region and a circumferential region, and a ratio of an area of the circumferential region with respect to that of the central region ranges from 0.1 to 0.5, a plugging length L1 in the cell extending direction of a central plugging portion in the central region is larger than a plugging length L2 of a circumferential plugging portion in the circumferential region, L1 ranges from 7 to 9 mm, and L2 from 3 to 6 mm.

A coating method includes depositing a slurry including a coarsely particulate ceramic and a finely particulate ceramic on a base material configured with an oxide-based ceramics matrix composite such that a proportion of coarse particles decreases towards a surface of the base material; forming a bond coating by performing a heat treatment on the base material on which the slurry has been deposited; and forming a top coating by thermally spraying a ceramic onto the bond coating. The oxide-based ceramics matrix composite is an alumina silica type oxide-based ceramics matrix composite. The coarsely particulate ceramic and the finely particulate ceramic are alumina-based powder.

Disclosed are composite building boards and associated manufacturing methods. The composite boards may include, for example, one or more slurry layers with embedded fibrous mats. An exterior plastic coating is mechanically adhered to the underlying slurry layer. The plastic layer chemically bonds and cross-links with polymer additives within the slurry layer. The result is an integrated polymer matrix with greatly improved durability and surface strength.

The invention concerns a gypsum plasterboard (10) comprising at least an upper gypsum layer (16) having a first density, first hardness and first thickness and a lower gypsum layer (17) having a second density, a second hardness and a second thickness. The first density is lower than the second density and/or the first hardness is lower than the second hardness, and the first thickness is lower than the second thickness. The plasterboard according to the invention are heavy or dense plasterboards with an enhanced fixing ability.

A plasterboard includes a first layer of plaster and a second layer of plaster, wherein the first layer includes activated carbon; the second layer includes a scavenging agent, wherein a content of scavenging agent in the first layer, expressed as percentage by weight of dry matter, is less than a content of scavenging agent in the second layer, and wherein the second layer is free of activated carbon.

A fireproof molding body having a hot side and a cold side opposite said hot side, wherein the fireproof molding body includes a first material with ceramic hollow sphere structures, wherein an amount of hollow sphere structures decreases from the hot side to the cold side. A method for producing a fireproof molding body in which a first material with ceramic hollow sphere structures is introduced into a casting mold and a grading of the hollow sphere structures is subsequently performed.

The invention discloses micron-nano pore gradient oxide ceramic films with biological activity, which are prepared by the following methods: The surface structures are biomedical engineering materials; Inorganic precursor coating solutions or the organic precursor coating solutions are prepared with or without micron and nanopore additives; The surface structures of the substrate are treated in the following steps: (1) The surfaces of the substrate are coated by the inorganic precursor coating solutions or the organic precursor coating solutions with or without micron and nanopore additives; (2) The substrate with coatings are dried, sintered, naturally cooled, and cleaned. (3) The biomedical engineering materials with the micron-nanopore gradient oxide ceramic films, especially biomimetic micro-nanoporous gradient alumina film, yttrium partially stabilized zirconia film, and alumina doped yttrium partially stabilized zirconia films in this invention greatly improve biocompatibility and biological activity.

The invention relates to a method for producing thin layers of silicon carbide by means of a solution or dispersion containing carbon and silicon.

A coating having a thickness between 0.1 and 2 mm is obtained from a mixture with the following composition: 10-25% by weight of micronized powder; 40-60% by weight of inorganic gravels of petrographic origin of sizes comprised between 0.063-2 mm; 10-40% by weight of a polymerisable base resin selected from polyurethane, polyester, epoxy or acrylic, with additives, and optionally pigments. The proportion of the mentioned gravel and micronized powder of the coating being up to 90% in an inner most area of interphase between coating and surface of the petrous substrate, covering one third of the thickness of the coating. The method comprises depositing the mentioned mixture on the substrate and vibrating the assembly, and subsequently proceeding to a step of curing and subsequent mechanical finishing of the surface.