Search results
Results from the WOW.Com Content Network
Tantalum pentoxide (Ta 2 O 5) is the most important compound from the perspective of applications. Oxides of tantalum in lower oxidation states are numerous, including many defect structures , and are lightly studied or poorly characterized.
There are many challenges for the physical properties of the ideal dental restorative material. The ideal material would be identical to natural tooth structure in strength, adherence, and appearance. The properties of such material can be divided into four categories: physical properties, biocompatibility, aesthetics and application.
Tantalum carbide is widely used as sintering additive in ultra-high temperature ceramics (UHTCs) or as a ceramic reinforcement in high-entropy alloys (HEAs) due to its excellent physical properties in melting point, hardness, elastic modulus, thermal conductivity, thermal shock resistance, and chemical stability, which makes it a desirable ...
Tantalum ores often contain significant amounts of niobium, which is itself a valuable metal.As such, both metals are extracted so that they may be sold. The overall process is one of hydrometallurgy and begins with a leaching step; in which the ore is treated with hydrofluoric acid and sulfuric acid to produce water-soluble hydrogen fluorides, such as the heptafluorotantalate.
The synthesis of tantalocene trihydride was first reported by Green, McCleverty, Pratt, and Wilkinson in 1961. [1] Tantalum pentachloride was added to a solution of sodium cyclopentadienide in tetrahydrofuran and an excess of sodium borohydride with yields reaching 60%, although the authors report that the preparation does not always succeed.
Application of these metals requires a protective atmosphere or coating. The refractory metal alloys of molybdenum, niobium, tantalum, and tungsten have been applied to space nuclear power systems. These systems were designed to operate at temperatures from 1350 K to approximately 1900 K.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
The mineral group tantalite [(Fe, Mn)Ta 2 O 6] is the primary source of the chemical element tantalum, a corrosion (heat and acid) resistant metal.It is chemically similar to columbite, and the two are often grouped together as a semi-singular mineral called coltan or "columbite-tantalite" in many mineral guides.