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[10] [11] An alternative technique is reduction of tantalum pentoxide by carbon in vacuum or hydrogen atmosphere at a temperature of 1,500–1,700 °C (1,770–1,970 K; 2,730–3,090 °F). This method was used to obtain tantalum carbide in 1876, [ 12 ] but it lacks control over the stoichiometry of the product. [ 7 ]
Theoretically predicted phase diagram of carbon. The equilibrium pressure and temperature conditions for a transition between graphite and diamond is well established theoretically and experimentally. The pressure changes linearly between 1.7 GPa at 0 K and 12 GPa at 5000 K (the diamond/graphite/liquid triple point).
Carbon phase diagram, based on calculations from 1980s. Newer work indicates that the melting point doesn't go above about 9000 K. Source: J.M. Zazula (1997). "On Graphite Transformations at High Temperature and Pressure Induced by Absorption of the LHC Beam". CERN. Retrieved 2010-07. Author: Trackler (talk) 13:05, 18 July 2010 (UTC) Other ...
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The coefficient of thermal expansion of cemented tungsten carbide is found to vary with the amount of cobalt used as a metal binder. For 5.9% cobalt samples, a coefficient of 4.4 μm/m·K was measured, whereas 13% cobalt samples have a coefficient of around 5.0 μm/m·K.
Tantalum is a chemical element; it has symbol Ta and atomic number 73. It is named after Tantalus, a figure in Greek mythology. [11] Tantalum is a very hard, ductile, lustrous, blue-gray transition metal that is highly corrosion-resistant.
Phase transitions (phase changes) that help describe polymorphism include polymorphic transitions as well as melting and vaporization transitions. According to IUPAC, a polymorphic transition is "A reversible transition of a solid crystalline phase at a certain temperature and pressure (the inversion point) to another phase of the same chemical composition with a different crystal structure."
Fly rod building is the art of constructing a fly fishing rod to match the performance desires of the individual angler. Fly rods are usually made of graphite or cane poles. There are several commercial manufacturers of fly rods, including Echo, Hardy, Zephrus, G. Loomis, Orvis, Reddington, Sage, Scott, St. Croix, Temple Fork Outfitters, and R. L. Winston; however, many individuals make fly ...