High-energy ball-milled (α-Fe2O3)(α-Al2O3) system: A study on the milling time effects

Cótica, L. F.; Paesano, Andrea; Zanatta, Shalimar Calegari; Medeiros, S.N. de; Cunha, J.B.M. da

doi:10.1016/j.jallcom.2005.05.046

Cited by 14 publications

(5 citation statements)

References 25 publications

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“…The spectrum recorded at 300 K, at a maximum velocity of 4.39 mm s −1 , shows an asymmetric doublet with isomer shift (IS) and quadrupole splitting (QS) typical of iron( iii ). 65 The spectrum is related to Fe 3+ embedded within the alumina structure, as suggested in a previous work on a high-energy-ball-milled (α-Fe 2 O 3 ) x (Al 2 O 3 ) 1− x system for x ranging from 0.02 to 0.30 and with milling time of 24 h. 66 In fact, Cótica et al found doublets with IS in the range from 0.32 to 0.39 mm s −1 and QS values in the range between 0.70–1.18 mm s −1 . According to Cótica et al the doublet is due to iron substituting aluminum in the alumina matrix.…”

Section: Resultsmentioning

confidence: 84%

“…According to Cótica et al the doublet is due to iron substituting aluminum in the alumina matrix. 66 In the present work, to fit the spectrum of sample Fe10Al90Cu we considered a distribution of doublets. The obtained average isomer shift and quadrupole splitting are 〈IS〉 = 0.41 mm s −1 and 〈QS〉= 1.17 mm s −1 , as shown in Table S9 †.…”

Section: Resultsmentioning

confidence: 99%

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Catalytic dehydration of glycerol over Cu–Fe–Al-based oxides: understanding changes in active sites throughout the reaction

Barbosa,

Tavares,

Albuquerque

et al. 2023

RSC Adv.

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Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Catalytic dehydration of glycerol over Cu–Fe–Al-based oxides: understanding changes in active sites throughout the reaction

Barbosa,

Tavares,

Albuquerque

et al. 2023

RSC Adv.

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“…Besides of the raw material, to know the rheological properties of wax binder material can be also important, since mainly the binder material defines the rheological behavior and viscosity of injection molding raw material. [20,21,22]…”

Section: Fig 1 the Applied Dynamical Rotation Rheometer And The Princ...mentioning

confidence: 99%

Quality Control Methods of Al<sub>2</sub>O<sub>3</sub> Based Ceramic Injection Molding Raw Materials

Egész

Gömze

2015

MSF

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In the illuminant industry, for producing arc tube parts for high intensity discharge lamps the applied method is the ceramic injection molding. The ceramic arc tube parts are made of high purity alumina powder. By producing ceramic parts, one of the most critical step is to optimizing the injection molding process, [1] but first of all we need to know the properties of injection molding raw material, because later the molding process will be optimized for this material, to decrease the amount of cracked ceramics.For producing ceramic arc tube parts (plugs), there are used two different major components for producing injection molding raw material (feedstock): high purity alumina powder as the main component, and an organic paraffin wax as a binder material. It is expressly important to know the material, physical and chemical properties of these components, since mainly these have affect on the homogenity of feedstock, and therefore on the quality of end product. [3]In this research, both of the main components and the moldable raw material was investigated by visual, physical, chemical and thermal methods. As most important and main statement, the researchers found that the dynamic viscosity of the injection molding raw material depends on the used mixer equipment and the applied deformation velocity.Applied analitycal methods were laser granulometry, differential thermal analysis, and rheological analysis.

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“…Mainly, this property defi nes the behaviour of the material during injection molding, and identifi es the fl ow behaviour in the molding tool, thus it can have eff ect on the quality of the end product [28][29][30][31][32][33][34][35].…”

Section: Rheological Testmentioning

confidence: 99%

Measurable properties of Al2O3 ceramic injection molding raw materials

Egész¹,

Gömze²

2013

Epitoanyag - JSBCM

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Powder injection molding (PIM), which encompasses metal injection molding (MIM) and ceramic injection molding (CIM), is a process which enables large scale production of complex-shaped components for use in a diverse range of industries. Ceramic injection molding (CIM) is a technology for manufacturing complex, precision, netshape components from ceramic powder. In the illuminant industry, for producing arc tube parts for high intensity discharge lamps the applied method is the ceramic injection molding. The ceramic arc tube parts are made of high purity alumina powder. By producing ceramic parts, one of the most critical steps is to optimize the injection molding process, to determine and control the influential machine parameters, which have an effect on the quality of the end product. Nevertheless, the properties of injection molding raw material is needed to be known before any optimization of the injection molding process, because later the molding process is optimized for this material, to decrease the amount of cracked ceramics. For producing ceramic arc tube parts (plugs), there are two different major components used for producing injection molding raw material (feedstock): high purity alumina powder as the main component, and an organic paraffin wax as a binder material. It is expressly important to know the physical and dimensional properties of the alumina powder, since mainly these have affect on the homogeneity and viscosity of feedstock, and therefore on the quality of the end product. In the present research, both the main components and the moldable raw material were investigated by visual, physical, chemical and thermal methods. It was found -most importantly -that the viscosity of the raw material linearly decreases with the increasing grinding time of the alumina powder. Applied analytical methods in terms of laser granulometry, tap density analysis, differential thermo-analysis and rheology analysis were used. Keywords: alumina powder, paraffin wax, ceramic injection molding, laser granulometry, tap density, differential thermo-analysis, rheology analysis

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High-energy ball-milled (α-Fe2O3)(α-Al2O3) system: A study on the milling time effects

Cited by 14 publications

References 25 publications

Catalytic dehydration of glycerol over Cu–Fe–Al-based oxides: understanding changes in active sites throughout the reaction

Catalytic dehydration of glycerol over Cu–Fe–Al-based oxides: understanding changes in active sites throughout the reaction

Quality Control Methods of Al<sub>2</sub>O<sub>3</sub> Based Ceramic Injection Molding Raw Materials

Measurable properties of Al2O3 ceramic injection molding raw materials

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