The present invention relates to electrically conductive, coloured interference pigments, in particular flake-form interference pigments, which have an outermost layer which comprises crystalline carbon in the form of graphite and/or graphene, to a process for the preparation of such pigments, and to the use of the pigments prepared in this way.

A process for producing a molded insulating part, a molded insulating part and a casting tool for the production of an inorganic pulp composed of water, glass fibers and/or mineral fibers and sheet silicate, introduction of the pulp into a cavity of a casting tool whose wall is at least partially water-permeable, which cavity has on at least one side the negative shape of the molded insulating part to be produced, removal of the aqueous fraction present in the pulp, opening of the casting tool and subsequent taking-out of the molded insulating part produced. The pulp produced using water for producing the molded insulating part comprised a glass fiber/sheet silicate mixture or mineral fiber/sheet silicate mixture has a proportion of exclusively synthetic sheet silicate (5) in the range from 0.5% to 2.5% and a proportion of glass fibers and/or mineral fibers (4) of from 0.3 to 1.5%.

A refractory, coarse ceramic product including at least one granular refractory material, has an open porosity of between 22 and 45 vol.-%, in particular of between 23 and 29 vol.-%, and a grain structure of the refractory material, wherein the medium grain size fraction with grain sizes of between 0.1 and 0.5 mm is 10 to 55 wt.-%, in particular 35 to 50 wt.-%, and wherein the remainder of the grain structure is a finest grain fraction with grain sizes of up to 0.1 mm and/or coarse-grain fraction with grain sizes of more than 0.5 mm.

A honeycomb structure includes a honeycomb structure body having a partition wall which is constituted of a porous body. The porous body includes a refractory aggregate and a bonding material. The porous body constituting includes the bonding material at a mass proportion of 20 to 35 mass %. In an observation of a cross section of the partition wall with an electron microscope, when observing any given ten visual fields meeting a following condition (1), the number of refractory aggregates meeting a following condition (2) is five pieces or more in all of the ten visual fields. Condition (1): a proportion of an area occupied by the bonding material is 30% or more. Condition (2): the refractory aggregate has a particle diameter of 5 μm or more, and 60% or more of an outer circumference of the refractory aggregate is surrounded by the bonding material.

The present invention is related to the development of a new formulation of electrical grade porcelain having improved mechanical and dielectric characteristics, and whose primary application is in electrical components, such as electric insulators.

This invention has as its main object to provide a new alternative to increase the final properties of an electrical grade porcelain, which is related to the incorporation of suitable concentrations of nanosized ceramic oxides, as part of the initial composition of porcelain paste.

This new nanotechnology alternative favors an increase in the final properties of electrical grade porcelain, such as flexural strength or cold rupture modulus, as well as dielectric strength, which is due to the incorporation of ceramic oxides such as alumina (α-Al.sub.2O.sub.3) and zirconia (ZrO.sub.2), in micrometer scale (i.e., less than 100 nanometers), favorably modify the microstructure of the base porcelain.

Mechanical strength, specifically the flexural strength at three points, of the porcelain compositions of the present invention is up to 38% greater than a silica based conventional porcelain composition. Furthermore, the insulating ability of the composition of this invention is up to 30% above the value of the reference siliceous porcelain.

Another important aspect of this invention is based on the concept that the ceramic nano-oxides of (α-Al.sub.2O.sub.3) and zirconia (ZrO.sub.2) strengthen the microstructure of siliceous porcelain, since the amount of crystalline phase increases and therefore the amorphous phase is reduced. Furthermore, the ceramic nano-oxides favor the increase in the concentration of the crystalline mullite phase (3Al.sub.2O.sub.3.2Si0.sub.2) in the microstructure, which is known to benefit the mechanical performance of triaxial porcelains.

A process of manufacturing a chromium alloyed molybdenum silicide portion of a heating element comprising the steps of: forming a mixture of a chromium powder and a silicon powder; reacting the mixture to a reaction product in an inert atmosphere at a temperature of at least 1100° C. but not more than 1580° C.; converting the reaction product to a powder comprising CrSi.sub.2; forming a powder ceramic composition by mixing the powder comprising CrSi.sub.2 with a MoSi.sub.2 powder and optionally with an extrusion aid; forming the portion of the heating element; and sintering the portion of the heating element in a temperature of from about 1450° C. to about 1700° C.; characterized in that the chromium powder and the silicon powder are provided separately to the mixture.

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 coating liquid for preparing a needle-shaped cylinder liner, comprising the following components: 0.05-0.4 parts of an anionic surfactant; 0.05-0.5 parts of tannic acid; 0.15-0.7 parts of caustic soda; 22-38 parts of diatomite; 3-10 parts of montmorillonite; and 62-75 parts of water. A method for preparing a needle-shaped cylinder liner comprises spraying a coating liquid for preparing the needle-shaped cylinder liner onto the inner wall of a hollow cylindrical mould, and drying the coating liquid to obtain a mould with a coating attached to the surface of the inner wall; adding an inoculated iron liquid into the rotary mould, and cooling and demoulding to obtain a cylinder liner blank; and subjecting the blank to outer surface cleaning and forming machining to obtain the needle-shaped cylinder liner.

A filter material composing a ceramic clay having an interconnected network of pores formed from cellulose fiber combustion is useful for removing chemical and biological contaminants from a water supply. Coating the ceramic clay with lanthanum enhances the removal of anionic species of As(V), As(III), Cr(VI), microbes and virus.

A pillar shaped honeycomb structure includes: a porous partition wall that defines a plurality of cells, the cells forming flow paths for a fluid, the cells extending from an inflow end face to an outflow end face; and an outer peripheral wall located at the outermost circumference. The cells include: a plurality of cells A wherein a side of the inflow end face is opened and the outflow end face has a plugged portion; and a plurality of cells B wherein a side of the outflow end face is opened and the inflow end face has a plugged portion, the cells B being arranged alternately with the cells A. One or both of the plugged portion of the cells A and the plugged portions of the cells B contain a magnetic substance and glass.