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Preparation and Composition of Fe-Ni Alloy Nitrides and the Study of the Magnetism

Author: ZhangHanQing
Tutor: DongGuoJun
School: Harbin Engineering University
Course: Applied Chemistry
Keywords: Liquid phase reduction method Coprecipitation Nitriding Programmed temperature method Nano- iron-nickel alloy
CLC: TG146.15
Type: Master's thesis
Year: 2009
Downloads: 51
Quote: 0
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Abstract


In this paper, the liquid phase reduction method with polyethylene glycol as dispersant in a 1:1 molar ratio of iron nitrate and nickel nitrate mixed salt solution was added dropwise alkaline solution of potassium borohydride , after natural drying Preparation of Fe- nano- Ni alloy powder , measured specific surface area of ??265.14 m2 / g. The tubular reactor to ammonia as the nitriding gas , heating method using the procedure to change the final reaction temperature , the flow rate of ammonia , nitrogen protective gas and cooling process , the Fe-Ni alloy powder nitriding nm , prepared composition different iron-nickel alloy nitride . Iron-nickel alloy nitride XRD results show ,440-510 ℃ is the most suitable temperature conditions generated Fe2Ni2N . To prepare pure phase Fe2Ni2N, must have a large ammonia flow rate (60 mL / min or more ) and the appropriate temperature two conditions . Nitrided iron-nickel alloy XPS results showed that samples from the NiO, Fe2O3, Fe2Ni2N and B2O3 composition . NiO, Fe2O3 occurs because Fe2Ni2N high surface energy passivation partial oxidation reaction product is small . Ammonia can not be Fe-Ni alloy powder nano Central Plains and some B2O3 restore. Iron-nickel alloy nitride TEM results showed that the alloy at 550 ℃ crystalline phase change significantly , there Fe3Ni3B generation, while the temperature rise , but also led to the crystal growth , nano- alloy grains significantly increased, the particle size of 20 - 30nm. Coprecipitation method using Fe-Ni nano- alloy powder specific surface area of ??83.38 m2 / g. At 500 ℃ and 550 ℃ under programmed temperature nitriding , small ammonia flow rate (30 mL / min) under a lot of mixed peaks . Large ammonia flow rates , not obtained pure phase Fe2Ni2N, its composition is Fe2Ni2N and Fe3Ni3B. Iron-nickel alloy nitride BET results showed that nitriding process occurs particle migration or aggregation after nitriding alloy was significantly smaller than the surface area . With the deepening of nitriding , surface area smaller than a trend . Iron- nickel alloy powder VSM nitride results show that iron- nickel alloys Fe3Ni3B nitride content is, the greater the saturation magnetization .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Heavy non - ferrous metals and their alloys > Nickel
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