The invention relates to a grain for production of a refractory product, to the use of such grains, to a refractory product, to a process for producing a refractory product and to a refractory product produced thereby.

A composite material containing carbon and a plastic includes: a) provision of a pulverulent composition with one or more components of amorphous carbon, graphite and mixed forms thereof, b) provision of a liquid binder, c) planar deposition of a layer consisting of the material provided in step a) and local deposition of droplets of material provided in step b) onto this layer and any number of repetitions of step c), the local deposition of the droplets in the successive repetitions of this step being adapted according to the desired shape of the component to be produced, d) at least partial curing or drying of the binder to obtain a green body that has the desired shape of the component, e) impregnation of the green body with a liquid synthetic resin and f) curing of the synthetic resin to produce a synthetic resin matrix.

In an example of a method for three-dimensional (3D) printing, a build material composition is applied to form a build material layer. The build material composition includes a polymeric or polymeric composite build material, and a precipitating agent. Based on a 3D object model, a fusing agent is selectively applied on at least a portion of the build material composition. The fusing agent includes a radiation absorber, which the precipitating agent precipitates. The build material composition is exposed to radiation to fuse the at least the portion to form a layer of a 3D part.

Disclosed is a porous ceramic heating element composition and a ceramic heating structure made of the composition, and the composition includes: a mixture including a ceramic mixed powder, which is formed by mixing at least one of an aluminum nitride and a silicon nitride with a silicon carbide powder, and a silicon-based metal powder which is mixed with the ceramic mixed powder; a pore agent, wherein 0.5 parts by weight to 5 parts by weight of the pore agent is mixed with 100 parts by weight of the mixture; and a binder which is mixed with the mixture and maintains the bonding between the ceramic mixed powder and the metal powder. 20 parts by weight to 30 parts by weight of the binder is included in 100 parts by weight of the mixture.

A -SiC coating made by the method of mixing SiO.sub.2 with carbon and heating the mixture in vacuum wherein the carbon is oxidized to CO gas and reduces the SiO.sub.2 to SiO gas and reacting a carbon material, comprising stainless steel with a carbon coating, with the SiO gas at a temperature in the range of 1300 to 1600 C. resulting in a SiC coating on the stainless steel.

Composite materials with thermoelectric properties and devices made from such materials are described. The thermoelectric composite material may comprise a metal oxide material and graphene or modified graphene. It has been found that the addition of graphene or modified graphene to thermoelectric metal oxide materials increases ZT. It has further been found that the ZT of the metal oxide becomes effective over a broader temperature range and at lower temperatures.

Method for manufacturing porous products consisting essentially of titanium suboxide(s) of general formula TiOx, the value of x being between 1.6 and 1.9, the method including a) mixing the raw materials including at least one source of titanium dioxide, a reducing agent comprising carbon, b) forming the product, c) optionally, in particular when organic products are used during step a), thermal treatment under air or an oxidizing atmosphere, d) sintering, for example at a temperature above 1150 C. but not exceeding 1430 C., under a neutral or reducing atmosphere, in which the source of titanium dioxide consists of at least 55 wt % of anatase.

A SiC based sinterable powder mixture comprising, by dried weight of said powder: a) a mineral content comprisingsilicon carbide (SiC) particles, -mineral boron compound particles, the powder comprising at least 50% by weight of SiC and the total mineral content of the powder being at least 90% by weight, b) at least a water insoluble carbon-containing source, in particular a carbon containing resin, the powder comprising at least 1% by weight, and preferably less than 10% by weight,of said water insoluble carbon-containing source, wherein the average particle size of said sinterable powder is comprised between 0.5 to 2.0 micrometers.

A system of infiltration for producing a ceramic matrix composite (CMC) is provided in which a slurry is applied to an outer surface of a porous preform. The porous preform includes a framework of ceramic fibers. The slurry may include a solvent and a particulate. The porous preform may be infiltrated with the slurry. The particulate in the slurry may include a plurality of coarse particles and a plurality of fine particles. The coarse particles may have a d50 factor of 10-20 microns. The fine particles may have a d50 factor of 0.5-3 microns. A ratio of coarse particles to fine particles in the slurry may be between 1.5:1 and 4:1, inclusively.

The present invention concerns the field of refining metal melts or slags and provides in particular a reactive material based on calcium aluminate and carbon, its process of preparation and various methods for refining metal melts using the same.