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Chang, Dae Kyu; Won, C.W.; Chun, Byong Sun; Shim, Gun Choo

doi:10.1007/bf02653893

Cited by 2 publications

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“…In our case, we decided to study the formation of two ternary phases in the system A1 Ni Ti, y' and H. Nickel and titanium aluminides have already been under scrutiny because of their attractive mechanical properties at high temperature which could make them subtitutes for superalloys. SHS requires small energy quantities and leads to cleaner products because of the combustion front high temperature which is responsible for volatilization of many impurities and the absence of contamination due to melt-crucible interface reactions during the routine melt processing [4]. We want to determine the reaction steps and their kinetics.…”

Section: Introductionmentioning

confidence: 99%

Real Time X-Ray Diffraction Study of the Formation by SHS of the Phases γ' and H in the Ternary System Al Ni Ti

et al. 1996

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The formation of two compositions (A10,20Ni0~75Ti0,05 (y') and ~~2 7 N i , 5 0 T i 0 , 2 3 @ I ) ) in the ternary system Al Ni Ti by solid-state high temperature synthesis (SHS) was investigated. In addition Time-Resolved X-Ray Diffraction (TRXRD) studies were carried out using a synchrotron X-ray beam and a fast detection system to monitor the phase transformations. With a time resolution of 30 ms, it was possible to observe intermediate phases by scattering of the intense X-ray beam irradiating the sample surface during the passage of the combustion front. For the two reactions Ni(A1) was observed before the appearance of the final product. These experiments have been completed by Electron-Probe MicroAnalysis (EPMA) of sample in which the reaction had been stopped. They showed concentration gradients and transitory states. Moreover, we noted for the y' formation a steady combustion propagation with a great speed while propagation of the combustion front for the H formation was pulsating. Associating these two techniques led to a better understanding of the different phenomena which exist during liquid-solid or solid-solid combustion reaction.

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Section: Introductionmentioning

confidence: 99%

Real Time X-Ray Diffraction Study of the Formation by SHS of the Phases γ' and H in the Ternary System Al Ni Ti

et al. 1996

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“…8(a) before and 8(b) after reduction at 800 ºC for 120 minutes. The temperature of 800ºC was high enough to treat zinc ferrite to be zinc oxide because the other carbothermic processes operated at quite high temperatures, more than 1,000 ºC, and zinc was turned to be zinc vapour and then reoxidation to be zinc oxide which consume large amount of energy [4].…”

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The Decomposition of Zinc Ferrite in Electric Arc Furnace Dust by Carbon

Polsilapa

Intakuean

Promboobpa

2015

KEM

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The objective of this research is to study the mechanism of the decomposition of zinc ferrite to obtain crude zinc oxide (ZnO) and iron oxide by using carbon (activated carbon) powder as the reducing agent. Zinc ferrite could be mostly found in electric arc furnace dust (EAFD). Carbon with a purity of 99.99 percent by weight was ground to be fine powder with an average size of 75 microns. Then the mixer between zinc ferrite with carbon powder and EAFD with carbon at the ratio of 1:1, 1:2 and 1:3 by mole was carried out. The samples were treated in the range of temperatures at 600, 700 and 800 °C in TGA. The treated samples were analyzed by XRD in order to identify the phase transformation of zinc ferrite. It was found that the quantity of zinc ferrite, both either pure zinc ferrite and the zinc ferrite in EAFD were decreased after treating by carbon when using treating time at 120 minutes with the temperatures of 600, 700 and 800 °C, and ratio of zinc ferrite with carbon powder at 1:3 by mole. Moreover about 70% of zinc ferrite was decomposed to be zinc oxide (ZnO) and iron oxides.

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Cited by 2 publications

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Real Time X-Ray Diffraction Study of the Formation by SHS of the Phases γ' and H in the Ternary System Al Ni Ti

Real Time X-Ray Diffraction Study of the Formation by SHS of the Phases γ' and H in the Ternary System Al Ni Ti

The Decomposition of Zinc Ferrite in Electric Arc Furnace Dust by Carbon

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