Insulation materials have a coating of a partially cured polymer on a plurality of fibers, and the plurality of coated fibers in a cross-linked polymeric matrix. Insulation may be formed by applying a preceramic polymer to a plurality of fibers, heating the preceramic polymer to form a partially cured polymer over at least portions of the plurality of fibers, disposing the plurality of fibers in a polymeric material, and curing the polymeric material. A rocket motor may be formed by disposing a plurality of coated fibers in an insulation precursor, curing the insulation precursor to form an insulation material without sintering the partially cured polymer, and providing an energetic material over the polymeric material. An article includes an insulation material over at least one surface.

Disclosed is a hydraulically and chemically bonding refractory cement, which includes a caustic magnesia component having a BET specific surface area of at least 0.5 m.sup.2/g, and a carboxylic acid component, wherein the carboxylic acid component consists of at least one carboxylic acid that is only slightly water soluble and/or has a low dissolution rate in aqueous solutions, and which carboxylic acid component is capable of generating at least one soluble magnesium salt upon contact of the cement with water. Also disclosed is a corresponding refractory material containing the magnesia cement and to uses thereof for the manufacture of products useful in various industries.

Some variations provide a process for fabricating a ceramic structure, the process comprising: producing a plurality of preceramic polymer parts; chemically, physically, and/or thermally joining the preceramic polymer parts together, to generate a preceramic polymer structure; thermally treating the preceramic polymer structure, to generate a ceramic structure; and recovering the ceramic structure. The process may employ additive manufacturing, subtractive manufacturing, casting, or a combination thereof. A composite overwrap may be applied to the preceramic polymer structure prior to pyrolysis, and the composite overwrap also pyrolyzes to a ceramic composite and is a part of the final ceramic structure. The ceramic structure may be silicon oxycarbide, silicon carbide, silicon nitride, silicon oxynitride, silicon carbonitride, silicon boronitride, silicon boron carbonitride, or boron nitride, for example. The ceramic structure may have at least one dimension of 1 meter or greater, and may be a fully integrated ceramic object with no seams.

The invention relates to uniformed concrete comprising, in percentages by weight, (d) 87% to 98% of particles comprising more than 90 wt.-% alumina, (c) 1% to 7% silica fume particles, (f) 1% to 8% particles of a hydraulic cement, the fraction of said particles having a size less than 40 m being distributed as follows, in percentage by weight in relation to the weight of the unformed concrete: fraction <0.5 m: 4%, fraction <2 m: 5%, fraction <10 m: 19%, fraction <40 m: 34%-52%, fraction between 2 m and 40 m: 26.5%-34%,
the concentration of Zro2, in percentage by weight on the basis of the uniformed concrete, being less than 2%, and the concentration of organic fibres, in percentage by weight on the basis of the uniformed concrete, being less than or equal to 0.03%.

A method of forming a composite component. The method includes laying up a plurality of composite plies to form a composite ply core. Another step of the method includes partially processing the composite ply core to form a green state core. The method further includes machining a cooling cavity on an exterior surface of the green state core. Additionally, the method includes inserting a filler material within the cooling cavity. A further step includes wrapping composite plies around the green state core and filler material to secure the filler material and form an outer enclosure. In one step, the method includes processing the green state core and outer enclosure to form the composite component.

A component for a gas turbine engine including a core and an outer enclosure. The core includes an exterior surface extending along a length between a first end and a second end and at least partially defines a cooling cavity on the exterior surface extending from the first end along at least a portion of the length. The cooling cavity is fluidly coupled to an air supply at the first end. The outer enclosure includes an outer surface. The outer enclosure is positioned outside the core and extends from the first end of the core along at least a portion of the length of the core and at least partially defines the cooling cavity.

Disclosed is a honeycomb filter for collecting fine particles that includes a wall portion formed from a base material containing ceria-zirconia composite oxide and an inorganic binder. The wall portion has a gas permeability coefficient of 1.0 m.sup.2 or greater and 3.0 m.sup.2 or less.

A cementitious composition includes (i) white Portland cement having a fineness of about 350-550 m.sup.2/kg, D90 between about 11-50 m, and total combined iron oxide, manganese oxide, and chromium oxide <1.0% by weight (ii) light color pozzolan such as white silica fume, and (iii) at least one light color particulate material, such as ground granulated blast furnace slag (GGBFS) having a fineness greater than that of the white Portland cement, a D90 less than that of the white Portland cement, and total combined iron oxide, manganese oxide, and chromium oxide content <3.0% by weight and/or coarse limestone powder having a D90 greater than that of the white cement. The cementitious composition may include one or more of aggregates, fibers, or admixture. The cementitious composition can be a dry blend, fresh cementitious mixture, or hardened cementitious composition. The cementitious composition can be precast concrete, stucco, GFRC, UHPC or SCC.

A manufacturing method is a method of manufacturing a composite material molded article containing acicular hydroxyapatite. This manufacturing method comprises: a preparation step of mixing at least a calcium phosphate compound including -tricalcium phosphate, a calcium compound containing no phosphorus, cellulose nanofibers, and an aqueous solvent consisting of water and/or a hydrophilic solvent to obtain a mixture; a molding step of forming a molded article by using the mixture; a drying step of drying the molded article; and a synthesis step of performing synthesis treatment of the molded article after drying.

Disclosed is a honeycomb filter for collecting fine particles that includes a wall portion formed from a base material containing ceria-zirconia composite oxide and an inorganic binder. In a pore diameter distribution in which a pore diameter and a log differential pore volume measured through mercury porosimetry are respectively represented by a horizontal axis and a vertical axis, the wall portion has a peak in a range in which the pore diameter is greater than or equal to 0.01 m and less than 1 m and a peak in a range in which the pore diameter is greater than or equal to 1 m and less than or equal to 50 m.