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TaC x powders of desired composition are prepared by heating a mixture of tantalum and graphite powders in vacuum or inert-gas atmosphere ().The heating is performed at a temperature of about 2,000 °C (2,270 K; 3,630 °F) using a furnace or an arc-melting setup.
Dome coated with DLC for optical and tribological purposes. A ta-C thin film on silicon (15 mm diameter) exhibiting regions of 40 nm and 80 nm thickness. A Co-alloy valve part from a producing oil well (30 mm diameter), coated on the right side with ta-C, in order to test for added resistance to chemical and abrasive degradation in the working environment.
Aquadag is a trade name for a water-based colloidal graphite coating commonly used in cathode ray tubes (CRTs). It is manufactured by Acheson Industries, a subsidiary of ICI. The name is a shortened form of "Aqueous Deflocculated Acheson Graphite", [1] but has become a generic term for conductive graphite coatings used in vacuum tubes. Other ...
In metallurgy, carbiding or carburizing is the process for producing carbide coatings on a metal piece. [1] ... The graphite intercalation compound KC 8, ...
Graphitization can be observed in various contexts. For example, it occurs naturally during the formation of certain types of coal or graphite in the Earth's crust.It can also be artificially induced during the manufacture of specific carbon materials, such as graphite electrodes used in fuel cells, nuclear reactors or metallurgical applications.
Graphite (/ ˈ ɡ r æ f aɪ t /) is a crystalline allotrope (form) of the element carbon. It consists of many stacked layers of graphene, typically in the excess of hundreds of layers. Graphite occurs naturally and is the most stable form of carbon under standard conditions.
These coating materials exhibit uniform distribution of fine particles and porous microstructures, which increased hydrogen flow rates. Another method for the synthesis of UHTCs is the borothermic reduction of ZrO 2 , TiO 2 , or HfO 2 with B. [ 46 ] At temperatures higher than 1600 °C, pure diborides can be obtained from this method.
This tendency can be decreased by coating the silicon carbide particles with a suitable oxide or nitride, preoxidation of the particles to form a silica coating, or using a layer of sacrificial metal. [9] An aluminium-aluminium carbide composite material can be made by mechanical alloying, by mixing aluminium powder with graphite particles.