摘要:
Disclosed in the present invention are a high-entropy ceramic inert matrix dispersion fuel pellet and a preparation method therefor. The preparation method comprises: S 1, preparing raw material powder into a slurry and mixed powder, respectively; S2, spraying the slurry on the surfaces of rolling fuel particles, and drying to form a coating layer adhered to the surface of the fuel particles; S3, preparing a core biscuit and a core-shell biscuit; S4, loading the core biscuit into the core-shell biscuit, and performing heat treatment to obtain a ceramic green body; and S5, performing solution and sintering treatment to form a densified high-entropy ceramic inert matrix dispersion fuel pellet. The high-entropy ceramic inert matrix dispersion fuel pellet is prepared by means of an in-situ reaction-solid solution sintering two-step method, and the characteristics that the fuel pellet is high in heat conductivity, low in swelling, easy to post-process, suitable for industrial production and the like are achieved: the nuclear fuel containment under the condition that a nuclear reactor cladding is damaged is improved, the leakage of the nuclear fuel is prevented, and the nuclear power safety is improved; and the high-temperature resistance of the nuclear fuel is improved, and the application of the nuclear fuel in a high-temperature reactor is promoted.
摘要:
The disclosure provides for an article (10) including a substrate (12), an environmental barrier coating (EBC) (16), a bondcoat (14), and a boron source (20). The substrate (12) includes a silicon-including material. The EBC (16) is disposed over the substrate (12), and the bondcoat (14) is disposed between the substrate (12) and the EBC (16). The bondcoat (14) includes silicon. The boron source (20) is disposed within the article (10) to provide an effective amount of boron to form an oxide (18) including silicon and at least 0.1 weight percent boron during exposure of the bondcoat (14) to an oxidizing environment at a temperature greater than 900 degrees Celsius. The oxide (18) may be a borosilicate glass that is substantially devitrification resistant to prevent spallation of the EBC (16) and thereby enhance the temperature capability of the article (10).
摘要:
The present disclosure relates to ceramic matrix composites made by chemical vapor infiltration, methods of making the ceramic matrix composites, and ceramic matrix composite turbine components for use in a hot gas pathway. A method of fabricating a ceramic matrix composite is provided that can include the steps of: (i) forming a plurality of holes in a ceramic matrix composite preform of desired shape; and (ii) densifying the preform by a chemical vapor infiltration process to form a part or most of the matrix. A ceramic matrix composite is also provided that can be used in hot combustion gases made according to the aforementioned ceramic matrix composite fabrication method described herein.
摘要:
A molybdenum disilicide-based ceramic heating element holding structure includes a holding member that is attached to a base portion and that holds an elongated support member, for mounting a molybdenum disilicide-based ceramic heating element of an elongated shape at intervals in a long axis direction thereof. The molybdenum disilicide-based ceramic heating element mounted on the support member can be exchanged without breaking the holding structure. A plurality of elongated support members can be provided, and a U-shaped portion of an elongated molybdenum disilicide-based ceramic heating element having a meandering shape can be inserted and extracted from a uniaxial direction in a space partitioned by the base portion. The plurality of support members and the holding member holding the plurality of elongated support members are detachable and the support member is removable from the holding member.
摘要:
An electrical resistance element consists mainly of a silicide phase according to the formula Mo(Si 1-x Al x ) 2 , which phase forms alumina on the surface of the element. The element is intended to be used in connection with sintering of metal powder. Because of its surprisingly good ability to form an alumina layer on the surface, this material has shown to be very resistant against corrosion at high termperatures over 1500 °C in both reducing and oxidizing atmosphere.
摘要:
A heating element for use in industrial furnaces, which enables the use of a higher voltage over the element. The heating element includes a heating zone made of a molybdenum disilicide based material including 48-75% by volume of a non-conducting compound and two terminals made of a molybdenum disilicide based material including up to 25% by volume of a non-conducting compound.
摘要:
A silicon carbide-based porous body comprising a plurality of silicon carbide (SiC) particles as an aggregate and a binder which binds the silicon carbide particles to each other, wherein the content of the binder, i.e. [100×binder/(silicon carbide particles + binder)] is 5 to 70% by volume, the open pore ratio is 30 to 70%, and the binder contains at least one member selected from the group consisting of a Ti silicide, a Zr silicide, a Mo silicide and a W silicide, in an amount of at least 60% by volume of the total binder. The silicon carbide-based porous body can avoid excessive temperature elevation when it is used as a filter and the particulate matter (PM) captured thereby is burnt and removed.
摘要:
New methods are provided for manufacture of ceramic elements that include injection molding of two, three or more distinct ceramic layers or regions (20, 30, 40) that form the element. Ceramic elements (10) also are provided that are obtainable from fabrication methods of the invention.
摘要:
Procédé de préparation d'une céramique, selon lequel : - on mélange dans un récipient renfermant un liquide, 50% à 75% en masse d'un composé destiné à former une phase conductrice, et 25% à 50% en masse d'un ou plusieurs matériaux permettant la formation de phases isolantes de nitrure de silicium et d'oxynitrure de silicium modifié après un traitement thermique conduisant à un frittage ; - on effectue des opérations de broyage, de séchage et de tamisage de ce mélange ; - on effectue un pressage de ce mélange ; - et on effectue un frittage de ce mélange pour obtenir une céramique de porosité comprise entre 0 et 30%. Le frittage est effectué sous une pression d'au moins 50 bars d'un gaz non réactif vis-à-vis des constituants du mélange. Céramique ainsi obtenue, et bougie d'allumage la comportant.