Structural Analysis and Application in Dip Coating of Alumina Powder

IF 0.7 Q4 CHEMISTRY, MULTIDISCIPLINARY

Moscow University Chemistry Bulletin Pub Date : 2025-04-16 DOI:10.3103/S0027131424700536

Fatah Hadji, Rassim Younes, Mohand Amokrane Bradai, Nedjemeddine Bounar, Mikhail Alymov

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Abstract

This study focuses on producing alumina using a modified citrate method. The process involves thermally activating a chelate through biphasic drops between hydrated aluminum nitrate and citric acid. Thermal analysis via DSC/TGA followed by FTIR revealed absorption bands at varying temperatures until the formation of white crystallized alumina powder at 1000°C. XRD analysis indicated that the resulting sample has a refined hexagonal structure with the space group R-3c. SEM/EDAX analysis displayed a morphology resembling overlapping hives with a major chemical composition of Al and O. The dip-coating method applied a semi-colloidal Al-citric acid sol onto E335 steel substrate at a stable processing temperature of 700°C, confirmed by XRD analysis showing the formation of new crystals like AlFeO₃ and Al₁₁Fe₇. This structural configuration influenced dislocation density and microstrain inversely with grain size. SEM and EDS analysis confirmed the adhesion of alumina to the substrate through intermetallic phases.

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氧化铝粉末浸涂结构分析及应用

本研究的重点是利用改进的柠檬酸盐法生产氧化铝。该过程涉及通过水合硝酸铝和柠檬酸之间的双相滴热激活螯合物。热分析通过DSC/TGA和FTIR揭示了在不同温度下的吸收带，直到1000℃形成白色结晶氧化铝粉末。XRD分析表明，所得样品具有精细的六边形结构，空间基团为R-3c。SEM/EDAX分析显示其形貌类似于重叠的蜂箱，主要化学成分为Al和o。浸涂法将半胶体Al-柠檬酸溶胶涂在E335钢基体上，在700℃的稳定加工温度下，XRD分析证实其形成了AlFeO3和Al11Fe7等新晶体。这种结构形态对位错密度和微应变的影响与晶粒尺寸成反比。SEM和EDS分析证实了氧化铝通过金属间相与基体的粘附。

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来源期刊

Moscow University Chemistry Bulletin CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

1.30

自引率

14.30%

发文量

期刊介绍： Moscow University Chemistry Bulletin is a journal that publishes review articles, original research articles, and short communications on various areas of basic and applied research in chemistry, including medical chemistry and pharmacology.