A polymer-derived composition and method for providing a ceramic-based precursor coating on a metal surface are disclosed. The composition comprises one or more preceramic polymers admixed with one or more metal particulates. The composition is integrally disposed on and within the metal surface of a metal part through pressure-assisted pyrolysis of a metal particulate-filled preceramic polymer under appropriate conditions, thereby providing a corrosion-resistant and oxidation-resistant metal surface. The precursor coating composition is applied and dried onto the metal surface. The coated steel material is then hot stamped at a pre-defined temperature under a time and pressure conditions sufficient to pyrolyze precursor coating composition to form a protective coating on the surface of the steel. The coated steel material is then cooled. Further, the hot stamping is performed in a period of no more than 1 minute and at a temperature controlled at 400-800? C.

A process for producing a highly carbonaceous fibre or set of fibres including combining a structured precursor comprising a hydrocellulose fibre or a set of fibres, and an unstructured precursor, including lignin or a lignin derivative in the form of a solution having a viscosity less than 15,000 mPa.Math.s.sup.1 at the temperature at which the combination step takes place, in order to obtain a hydrocellulose fibre or set of fibres coated with the lignin or lignin derivative, wherein the process further includes a step of thermal and dimensional stabilization of the hydrocellulose fibre or set of fibres covered with the lignin in order to obtain a hydrocellulose fibre or set of fibres covered with a deposit of lignin or lignin derivative, and a carbonization step of the hydrocellulose fibre or set of fibres coated with a lignin deposit in order to obtain a highly carbonaceous fibre or set of fibres.

An ultra-fast sintering method and a sintering system for preparing nano-ceramics by ultrasonic-assisted pressurization and high-frequency induction, it belongs to the technical field of nano-ceramics sintering; this method mainly aims at the problem that nano-ceramics are easy to grow during sintering, and develops an ultrasonic-assisted pressurized coupled high-frequency induction sintering system to prepare nano-ceramic materials; in the process of sintering, ultrasonic wave is used to form high frequency, alternating impact and cavitation on nano-ceramic particles, which can quickly exhaust the gas between particles and inhibit the agglomeration of nano-ceramic particles; on the other hand, the rapid sintering of nano-ceramics is realized by using the principle of high-frequency induction to instantaneously heat the graphite mold and generate a lot of heat.

The embodiments herein provide a filter for cigarette comprising graphene nano-composite based material enclosed in a casing. The filter is reusable and is plugged to any cigarette, or tobacco smoking products. The filter is a stand-alone product or manufactured integrally with each individual cigarette. The filter provides a safe smoking option to tobacco smokers without changing their smoking habits by reducing the tar content and other toxic chemicals in the inhaled smoke. The graphene based nanocomposite filter adsorbs the toxic agents from the smoke (of cigarette, beedi, hookah etc). The filter is fabricated by treating ceramic particles and coating them with carbon particles. The carbon particles are carbonized. The ceramic particles coated with carbon are segregated based on shape and size and treated chemically to convert carbon into graphene under inert conditions. The graphene coated particles are chemically functionalized for improved filtration.

A layered body, which has a change in texture derived from zirconia, particularly a change in translucency and is suitable as a dental prosthetic member, a precursor thereof, or a method for producing these. The layered body has a structure in which two or more layers containing zirconia containing a stabilizer are layered, the layered body including at least: a first layer containing zirconia having a stabilizer content of higher than or equal to 4 mol %; and a second layer containing zirconia having a stabilizer content different from that of the zirconia contained in the first layer. At least a first layer and a second layer contain an element having a function of coloring zirconia and the content or the type of the element having a function of coloring zirconia in the first layer is different from the element having a function of coloring zirconia in the second layer.

An article including carbon-carbon composite substrate may be treated with an antioxidant coating prior to use in an oxidizing environment. The antioxidant coating may be configured to reduce oxidation at an external surface of the CC composition and reduce ingress of oxidants into pores or other open passages defined by the CC composite substrate to avoid internal oxidation. An example article includes a CC composite substrate, a bond coat, and an antioxidant coating. The CC composite substrate defines a friction surface and a non-friction surface. The bond coat is disposed on the non-friction surface. The antioxidant coating may be disposed on at least a portion of the bond coat. The antioxidant coating may include ytterbium disilicate and a sintering aid.

A preform intended for the production of a dental prosthesis. The preform includes a group of agglomerated ceramic, glass-ceramic or glass particles, such that, as volume percents: more than 40% and less than 90% of the particles of said group have a size greater than 0.5 ?m and less than 3,5 ?m, said particles hereinafter being denoted enamel particles, and more than 10% and less than 60% of the particles of said group have a size greater than 3.5 ?m and less than 5.5 ?m, said particles hereinafter being denoted dentine particles. The microstructure of the preform is such that there is an axis X, termed axis of variation, along which the Ve/(Ve+Vd) ratio changes continuously, Ve and Vd denoting the volume percents of enamel particles and of dentine particles, respectively. The enamel and dentine particles representing, together, more than 90% of the volume of the agglomerated particles.

Provided is an improved multilayered ceramic capacitor and an electronic device comprising the multilayered ceramic capacitor. The multilayer ceramic capacitor comprises first conductive plates electrically connected to first external terminations and second conductive plates electrically connected to second external terminations. The first conductive plates and second conductive plates form a capacitive couple. A ceramic portion is between the first conductive plates and said second conductive plates wherein the ceramic portion comprises paraelectric ceramic dielectric. The multilayer ceramic capacitor has a rated DC voltage and a rated AC V.sub.PP wherein the rated AC V.sub.PP is higher than the rated DC voltage.

Sintered cemented carbide powder compositions are disclosed for use in the production of various articles by additive manufacturing. The individual particles of the powder compositions comprise metal carbide particles sintered together with a metallic binder. The sintered cemented carbide particles comprise at least a bimodal size distribution in which the first mode comprising spherical sintered cemented carbide particles having a D50 of 15 ?m to 45 ?m and the second mode comprises non-spherical cemented carbide particles having a D50 of 5 ?m to 15 ?m. The metallic binder may be present in an amount of from 9 to 11 weight percent based on total weight of the sintered cemented carbide particles. Sintered cemented carbide bodies additively manufactured from the sintered cemented carbide powder compositions are disclosed. Methods of making the sintered cemented carbide powder compositions and methods of making the sintered cemented carbide bodies are also disclosed.

The present application discloses a sintered ceramic material having high fracture toughness and bending strength, which is obtained from an yttria-stabilized Zirconia powder, the powder composition for obtaining said material, sintered ceramic pieces and manufacturing process thereof. One of the solutions of the present invention discloses a sintered ceramic material which is obtained from an yttria-stabilized zirconia powder, comprising between 1.8 and 2.1 mol % yttria, wherein the sintered ceramic material has a percentage of tetragonal phase greater than 90% at room temperature, a grain size between 0.1 to 0.25 m, the bending strength is between 1150-2100 MPa, and simultaneously a toughness greater than 10 MPa.Math.m.sup.1/2. This material may be applied in different sintered ceramic pieces, including pieces for the automotive sector, for diverse machinery, ornamental applications such as timepieces or pieces for biomedical applications, among others.