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Noble metal ODS alloys, for example, platinum-based alloys, are used in glass production. When it comes to re-entry at hypersonic speeds, the properties of gases change dramatically. Shock waves that can cause serious damage on any structure are created. At these speeds and temperatures, oxygen becomes aggressive.
Nickel tungstate can also be prepared by the reaction of nickel(II) oxide and tungsten(VI) oxide. [6] It can also be obtained by the reaction of ammonium metatungstate and nickel(II) nitrate [7] or from the reaction of sodium tungstate, nickel(II) chloride and sodium chloride. [8] Nickel tungstate undergoes a phase transition at 700°C. [5]
During the sintering process, the nickel diffuses into the tungsten, producing an alloy. Tungsten can also be extracted by hydrogen reduction of WF 6: WF 6 + 3 H 2 → W + 6 HF. or pyrolytic decomposition: [74] WF 6 → W + 3 F 2 (ΔH r = +) Tungsten is not traded as a futures contract and cannot be tracked on exchanges like the London Metal ...
A nickelate is an anion containing nickel or a salt containing a nickelate anion, or a double compound containing nickel bound to oxygen and other elements. Nickel can be in different or even mixed oxidation states, ranging from +1, +2, +3 to +4. The anions can contain a single nickel ion, or multiple to form a cluster ion.
Flame test of a few metal ions. A flame test involves introducing a sample of the element or compound to a hot, non-luminous flame and observing the color of the flame that results. [4] The compound can be made into a paste with concentrated hydrochloric acid, as metal halides, being volatile, give better results. [5]
Nickel sulfamate can be used for nickel or mixed nickel-tungsten plating. [8] It can be formed by the action of sulfamic acid on nickel carbonate. [9] Nickel selenite NiSeO 3 has many different hydrates, anhydrous NiSeO 3 · 1 ⁄ 3 H 2 O, NiSeO 3 · H 2 O, NiSeO 3 · 2 H 2 O (which is also a mineral called ahlfeldite), and NiSeO 3 · 4 H 2 O. [10]
Metals in the middle of the reactivity series, such as iron, will react with acids such as sulfuric acid (but not water at normal temperatures) to give hydrogen and a metal salt, such as iron(II) sulfate: Fe (s) + H 2 SO 4 (l) → FeSO 4 (aq) + H 2 (g) There is some ambiguity at the borderlines between the groups.
An acid test is a qualitative chemical or metallurgical assay utilizing acid. Historically, it often involved the use of a robust acid to distinguish gold from base metals . Figuratively, the term represents any definitive test for attributes, such as gauging a person's character or evaluating a product's performance.
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