Oxidation Mechanisms of Copper and Nickel Coated Carbon Fibers

Abstract

Differential-Thermal Analysis (DTA) and X-ray diffraction analysis were applied to determine the mechanisms of high-temperature oxidation of copperand nickel-coated carbon fibers. Both kinds of coatings were deposited by electroless plating onto the fiber surface. The as-deposited copper film was crystalline, whereas the nickel coating consisted of an amorphous Ni-P alloy. Coated fibers were heated from room temperature to 900°C in air at 10°C min -1 . For the copper coating, the main oxidation product formed at low temperatures was Cu 2 O, while at higher temperatures was CuO. The crystallization of Ni-P took place at 280-360°C with the formation of Ni and Ni 3 P. The final compounds were NiO, Ni 2 P and Ni 3 (PO 4 ) 2 . After complete oxidation of the carbon fibers, copper and nickel-oxidized microtubes were obtained. Besides, while copper reduced the temperature of the fiber oxidation, nickel coatings increased the minimum temperature needed for this reaction.

Mapping the Cu-BTC metal–organic framework (HKUST-1) stability envelope in the presence of water vapour for CO2 adsorption from flue gases

“…4). Two exothermic peaks were discovered by DCS analysis after 280°C with first exothermic peak (280-300°C) corresponds to the formation of Cu 2 O [43] and the second one corresponds to the phase transformation of Cu 2 O to CuO [44].…”

Electroless Silver Coating on Copper Microcones for Low-Temperature Solid-State Bonding

“…Generally speaking, copper conforms to a logarithmic rule for thin oxide films at low temperature. [17][18][19] The oxide thickness on the Cu microcones coated with Ag for different oxidation times and temperatures is shown in Fig. 4.…”

Selective iron-catalyzed aerobic oxidation of alcohols in water to carboxylic acids mediated by additives

“…Based on the above-mentioned experiments, polyoxometalate 16 and iron-based catalysts, 17 which have been reported, a plausible mechanism is proposed in Scheme 3 (in the scheme, the chloride ion is not drawn for clarity of the whole reaction process). First, the oxidation is initiated through the one-electron transfer from PhCH 2 OH to the catalyst [Fe III Mo 6 O 18 (OH) 6 Cl] 4− ( I ) to give the reduced form II and the PhC˙HOH radical.…”

“…Based on the above-mentioned experiments, polyoxometalate 16 and iron-based catalysts, 17 which have been reported, a plausible mechanism is proposed in Scheme 3 (in the scheme, the chloride ion is not drawn for clarity of the whole reaction process).…”