摘要:
A method for production of self-supporting structures with features of the hollow ceramic fibre, where the sacrificial template is covered at least by one layer of sinterable particles, followed by drying of the coated sacrificial template, followed by pyrolysis of the sacrificial template, followed by sintering of the green body to the structure of the hollow ceramic fibre, where the sacrificial template is in a shape of fibre containing at least 50% of carbon, and the pyrolysis completely removes the sacrificial template.
摘要:
A piezoelectric composition 2 comprises a plurality of crystal particles 4, wherein the piezoelectric composition 2 includes bismuth, iron, barium, titanium, and oxygen; the crystal particles 4 include a core 6 and a shell 8 covering the core 6; the average value of the contents of bismuth in the cores 6 is expressed as C CORE % by mass, the average value of the contents of bismuth in the shells 8 is expressed as C SHELL % by mass, and the C CORE is lower than the C SHELL ; and the number of all the particles comprised in the piezoelectric composition 2 is expressed as N, the number of the crystal particles 4 including the core 6 and the shell 8 is expressed as n, and n/N is 0.10 to 1.00.
摘要:
Provided are inorganic fibers containing calcium and alumina as the major fiber components. According to certain embodiments, the inorganic fibers containing calcia and alumina are provided with a coating of a phosphorous containing compound on at least a portion of the fiber surfaces. Also provided are methods of preparing the coated and non-coated inorganic fibers and of thermally insulating articles using thermal insulation comprising the inorganic fibers.
摘要:
A method for coating a carbon fiber for a composite structure may comprise applying a slurry onto a surface of the carbon fiber, wherein the slurry is a sol gel comprising a metal precursor and a carrier fluid, and heating the carbon fiber to a temperature sufficient to form a sol gel-derived layer on the carbon fiber. The slurry may comprise a metal precursor such as a metal salt or a metal alkoxide. The sol gel-derived layer may help prevent the carbon fiber from oxidizing. The metal precursor comprises at least one of aluminum nitrate, calcium nitrate, aluminum isopropoxide, aluminum sec-butoxide, aluminum oxide, tetraethylorthosilicate (TEOS), zirconium n-propoxide, and titanium isopropoxide.
摘要:
The invention relates to a process to produce catalysts by powder injection moulding and the catalysts thereof, wherein the catalysts are made by preparing a ceramic formulation with temperature controlled rheological properties comprising catalytic components, heating the powder formulation up to at least the fluid state transition temperature, shaping a sample by injecting the fluid powder formulation into an injection mould followed by cooling the injected powder formulation below the fluid state transition temperature, de-binding the shaped sample, and sintering the shaped sample to form a ceramic catalyst. Alternatively the ceramic structure may be formed initially followed by a coating of the ceramic structure by one or more catalytic compounds.
摘要:
The invention relates to a method for manufacturing a fibrous preform filled with refractive ceramic particles (20), comprising the following steps: a) placing a fibrous structure comprising refractive ceramic particles into a mould cavity (2) defined by a mould (3) and a counter mould (4; 4'), b) injecting a slip, comprising a powder that has refractive ceramic particles (20) and is present in a liquid medium, into the porosity of the fibrous structure (1) in the mould cavity (2), the injection being carried out at least through a first surface (1a) or a first edge (1a') of said fibrous structure (1), and c) draining, through a component (5) made of porous material, the liquid medium from the slip that has penetrated the fibrous structure (1), the component made of porous material having a thickness of greater than or equal to 0.1 mm, the drainage being carried out at least through a second surface (1b) or a second edge of the fibrous structure (1) that is different from the first surface (1a) or the first edge (1a'), said component (5) made of porous material further allowing the powder having refractive particles (20) to be retained in the porosity of the fibrous structure (1) in order to obtain a fibrous preform filled with refractive particles (20), the component (5) made of porous material being between the mould (3) and the fibrous structure (1) or between the counter mould (4; 4') and the fibrous structure (1), and the component (5) made of porous material being between at least one outlet vent (16) and the fibrous structure (1), pumping being carried out in the region of the outlet vent (16) in order to drain the liquid medium through said outlet vent (16).
摘要:
A method of sensing strain in a structural component, the method comprising the steps of providing, embedded within said structural component, at least one carbon fibre element (10) coated with an electrically conductive material (12), measuring the electrical resistance of said coated carbon fibre element and determining strain in respect of said carbon fibre element based on changes in said electrical resistance thereof. A method of manufacturing a carbon fibre element, a carbon fibre element so manufactured, and a carbon fibre reinforced structural component including such a carbon fibre element are also disclosed.
摘要:
Provided is a novel method for producing a silicon carbide-carbon composite. A green body containing a carbonaceous material 2 having silicon nitride attached to a surface thereof is fired to obtain a silicon carbide-carbon composite 1.