The invention concerns a batch for the production of a refractory product, a process for the production of a refractory product, a refractory product as well as the use of a refractory product.

A method of fabricating a part out of composite material, includes forming a fiber texture from refractory fibers; placing the texture in a mold having an impregnation chamber including in its bottom portion a part made of porous material, the impregnation chamber being closed in its top portion by a deformable impermeable diaphragm separating the impregnation chamber from a compacting chamber; injecting a slip containing a powder of refractory particles into the impregnation chamber; injecting a compression fluid into the compacting chamber, to force the slip to pass through the texture; draining the liquid of the slip via the porous material part, while retaining the powder of refractory particles inside the texture so as to obtain a fiber preform filled with refractory particles; drying the fiber preform; unmolding the preform; and sintering the refractory particles present in the preform in order to form a refractory matrix in the preform.

A ceramic composition is disclosed comprising an inorganic batch composition comprising a magnesia source, a silica source, an alumina source, a titania source, and at least one rare earth oxide wherein the rare earth oxide comprises a particle size distribution (D.sub.90) of less than 5 m and a median particle size (D.sub.50) of about 0.4 m. A ceramic article comprising a first crystalline phase comprised predominantly of a solid solution of aluminum titanate and magnesium dititanate, a second crystalline phase comprising cordierite, a third crystalline phase comprising mullite, and a rare earth oxide, and a method of making same are disclosed.

Disclosed herein are ceramic materials comprising a ceramic phase and a glass phase and at least one of a reduced alkali content or a reduced iron content. Ceramic materials having relatively low creep rates are also disclosed herein, as well as glass forming bodies comprising such materials, and methods for making glass articles using such forming bodies. Refractory bricks for constructing glass manufacturing vessels are also disclosed. Methods for treating ceramic materials to reduce at least one of the alkali or iron content are further disclosed herein.

A refractory object may include a zircon body that may include at least about 0.1 wt. % and not greater than about 5.5 wt. % of an Al.sub.2O.sub.3 containing component for a total weight of the zircon body. The zircon body may further include at least about 25 wt. % and not greater than about 35 wt. % of a SiO.sub.2 component for a total weight of the zircon body.

There is provided a refractory article for use in metal casting and a composition for manufacture thereof, comprising a particulate refractory material, an oxidisable fuel, an oxidant, a sensitizer; a binder, and from 0.5 to 5 wt % CaSO.sub.4.

A method of forming a ceramic material includes providing a mixture of solid powder, which includes precursors of crystalline aluminum silicate, amorphous fluxing agent, and amorphous modifier. The method also sinters the mixture of solid powder at 1600? C. to 1800? C. to form the ceramic material, which includes 100 parts by weight of the crystalline aluminum silicate having a chemical formula of AlSi.sub.xO.sub.1.5+2x, wherein x is 0.21 to 0.35, 10 to 15 parts by weight of the amorphous fluxing agent, and 5 to 10 parts by weight of the amorphous modifier.

The present disclosure provides a preparation method of a fly ash-based ceramic membrane support, including the following steps: 1) subjecting fly ash to alkali washing and acid washing to obtain pretreated fly ash; 2) blending a raw material including the pretreated fly ash, and then conducting aging and extrusion molding to obtain a green body; and 3) spraying a surface water-retaining agent (including glycerol, tung oil, a diol, and polyethylene glycol) on a surface of the green body to allow static curing in a constant-temperature and constant-humidity environment, and then conducting drying and sintering after the curing is completed. The preparation method can effectively improve molding and sintering performances of the fly ash to obtain a fly ash-based ceramic membrane support with a qualified performance.

A method for producing a ceramic matrix composite is provided with: weaving a fabric from fibers of SiC; infiltrating SiC into pores in the fabric by vapor phase infiltration; executing solid phase infiltration by immersing the fabric after the vapor phase infiltration in an immersion liquid including a solvent, a SiC powder and a glass powder to infiltrate SiC and glass into the fabric; and executing liquid phase infiltration by immersing the fabric after the solid phase infiltration in an immersion liquid including a solvent and an organic silicon polymer and calcine the immersed fabric to infiltrate SiC into the fabric.

Provided is a polycrystalline ceramic substrate to be bonded to a compound semiconductor substrate with a bonding layer interposed therebetween, wherein at least one of relational expression (1) 0.7<.sub.1/.sub.2<0.9 and relational expression (2) 0.7<.sub.3/.sub.4<0.9 holds, where .sub.1 represents a linear expansion coefficient of the polycrystalline ceramic substrate at 30 C. to 300 C. and .sub.2 represents a linear expansion coefficient of the compound semiconductor substrate at 30 C. to 300 C., and .sub.3 represents a linear expansion coefficient of the polycrystalline ceramic substrate at 30 C. to 1000 C. and .sub.4 represents a linear expansion coefficient of the compound semiconductor substrate at 30 C. to 1000 C.