Abstract:
The proposal is for a temperature-resistant ceramic used especially as a solid electrolyte ceramic for gas sensors. The ceramic of the invention comprises at least two ceramic powders, and at least one ceramic powder is highly stabilised, i.e. contains at least 4 mol% yttrium oxide, and at least one second ceramic powder which is low-stabilised, i.e. contains between 0 and 2.5 mol% yttrium oxide, consists of grains, the surface of which has a coating, especially aluminium oxide, which inhibits the diffusion of the stabiliser oxide cations. According to the invention, a very uniform distribution of the aluminium oxide in the body of the ceramic is attained, with a concomitant improvement in the impact strength, endurance limit and temperature shock resistance without any adverse effect on the O2 ion conductivity.
Abstract:
L'invention concerne un procédé de dépôt d'un revêtement sur des fibres courtes (14) en carbone ou en carbure de silicium à partir d'un précurseur de revêtement, les fibres courtes présentant une longueur comprise entre 50 μm et 5 mm, le procédé comprenant au moins le chauffage des fibres courtes par placement d'un mélange (16) comprenant lesdites fibres et une phase liquide (12) du précurseur de revêtement dans un champ micro-ondes de façon à porter la surface des fibres à une température permettant la formation par caléfaction du revêtement sur les fibres à partir du précurseur de revêtement.
Abstract:
A method for preparing a nickel/aluminum spinel-coated aluminum oxide composite material includes coating the surface of an aluminum oxide powder with a nano-layer of NiO in an aqueous solution by a solution reaction method; and sintering the NiO-coated aluminum oxide powder to provide the spinel-coated aluminum oxide composite material.
Abstract:
The present invention provides a carbon fiber that is coated with a composite material. The composite material coating comprises a sulfonated tetrafluoroethylene based ionomer. The present invention also provides a method for producing and using the same. Some aspects of the invention provide a carbon fiber comprising a substantially uniformly coated composite material. In some embodiments, the term "substantially uniformly coated" refers to having a variation of thickness of the coating of about 25% or less, typically about 20% or less, often about 15% or less, more often about 10% or less, and most often about 5% or less throughout at least about 90%, typically at least about 95% and most often at least 98% of the length of the coated carbon fiber.
Abstract:
Included are methods to make ceramic proppants. The methods comprise coating green proppants with at least one reactive alumina or zirconium agent, such as gamma alumina. Also included are green proppants and liquid-phase sintered proppants made with the use of the reactive agent. Further included are uses for these proppants, such as in the oil and gas recovery areas.
Abstract:
Provided is a surface-coated barium titanate particulate for use in multilayer ceramic capacitors and for which the grain growth during high-temperature firing has been suppressed. Also provided is a production method for same. Barium titanate particulate obtained by means of a hydrothermal reaction, wherein the coated barium titanate particulate has an average particle diameter of at least 10nm but less than 1000nm, a Ba/Ti ratio of 0.80-1.20 inclusive, a c/a ratio of 1.001-1.010 inclusive, and a coating layer comprising a compound of Mg, Ca, Ba, and Mn and at least one kind of metal selected from the group consisting of rare earth elements is included on the surface thereof. The coated barium titanate particulate according to the present invention is produced by means of a method including: (1) a step for obtaining barium titanate particulate by mixing an aqueous solution containing barium hydroxide and an aqueous solution containing titanium hydroxide at a Ba/Ti ratio of 0.80-1.20 inclusive, and subjecting same to a hydrothermal reaction at a temperature of 200-450°C inclusive, a pressure of 2.0-50MPa inclusive, and for a reaction time of 0.1 minutes-1 hour inclusive; (2) a step for uniformly dispersing the barium titanate particulate in an aqueous solution; and (3) a step for coating the metal compound on the surface of the barium titanate particulate.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines keramischen Grünkörpers, ein Verfahren zu Herstellung eines keramischen Formkörpers sowie den Grünkörper und den keramischen Formkörper selbst.
Abstract:
A method of making a polycrystalline diamond cutter element includes forming a blend, comprising a first particle size of polycrystalline diamond particles and a second particle size of polycrystalline diamond particles; forming a suspension of nanocrystalline diamond particles suspended in a solvent; and mixing the blend into the suspension to form a polycrystalline diamond mixture comprising nanocrystalline diamond coated polycrystalline diamond particles. The mixture is sintered with a substrate at high temperature and high pressure to form the polycrystalline diamond cutter element.
Abstract:
A polycrystalline diamond material comprises a mass of diamond particles or grains exhibiting inter-granular bonding and a binder material comprising a non-metallic catalyst material for diamond, the non-metallic catalyst material for diamond being a metal oxoanion, the oxoanion being selected from the group comprising molybdates, tungstates, vanadates, phosphates and mixtures thereof.