Achieving in-situ alloy-hardening core-shell structured carbonyl iron powders for magnetic abrasive finishing

A conductive PANI/CIP composite with core/shell structure was prepared by in-situ polymerization of Aniline(Ani). In order to reduce the acid corrosion on carbonyl iron powders(CIP) in polymerization of Ani, the surface of CIP was modified by (3-aminopropyl)-triethoxysilane (APTES) before the polymerization. The influences of modification on Ani polymerization, the morphology changes of core/shell structure and conductivity of PANI/CIP composites were characterised and discussed. The results show that after CIP modified by APTES, the reaction process of Ani polymerization is more stable; the PANI particles on the surface of CIP are smaller, and more uniform and more compact; The coating effect of PANI on the surface of CIP is significantly improved; The composite conductivity changes slightly with the modification.

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Improve the Micro-hardness of Single Point Incremental Forming Product Using Magnetic Abrasive Finishing

Engineering and Technology Journal ◽

10.30684/etj.v38i8a.906 ◽

2020 ◽

Vol 38 (8A) ◽

pp. 1137-1142

Author(s):

Baqer A. Ahmed ◽

Saad K. Shather ◽

Wisam K. Hamdan

Keyword(s):

Vickers Hardness ◽

Feed Rate ◽

Incremental Forming ◽

Single Point ◽

Single Point Incremental Forming ◽

Step Size ◽

Coil Current ◽

Magnetic Abrasive Finishing ◽

Finishing Process ◽

Abrasive Finishing

In this paper the Magnetic Abrasive Finishing (MAF) was utilized after Single Point Incremental Forming (SPIF) process as a combined finishing process. Firstly, the Single Point Incremental forming was form the truncated cone made from low carbon steel (1008-AISI) based on Z-level tool path then the magnetic abrasive finishing process was applied on the surface of the formed product. Box-Behnken design of experiment in Minitab 17 software was used in this study. The influences of different parameters (feed rate, machining step size, coil current and spindle speed) on change in Micro-Vickers hardness were studied. The maximum and minimum change in Micro-Vickers hardness that achieved from all the experiments were (40.4 and 1.1) respectively. The contribution percent of (feed rate, machining step size, coil current and spindle speed) were (7.1, 18.068, 17.376 and 37.894) % respectively. After MAF process all the micro surface cracks that generated on the workpiece surface was completely removed from the surface.

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Process parameter optimization for the magnetic abrasive finishing of SS310s steel

Materials Testing ◽

10.3139/120.111467 ◽

2020 ◽

Vol 62 (2) ◽

pp. 157-164 ◽

Cited By ~ 1

Author(s):

Kandhasamy Suganeswaran ◽

Rathinasamy Parameshwaran ◽

Thangamuthu Mohanraj ◽

Balasubramaniyam Meenakshipriya

Keyword(s):

Parameter Optimization ◽

Process Parameter ◽

Process Parameter Optimization ◽

Magnetic Abrasive Finishing ◽

Abrasive Finishing

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In Situ Solvothermal Synthesis of CdS-Bi 2MoO 6 Core-Shell Heterostructures with Enhanced Photocatalytic Performance Under Visible Light

SSRN Electronic Journal ◽

10.2139/ssrn.3708736 ◽

2020 ◽

Author(s):

Abhijit Kadam ◽

Chinna Bathula ◽

Sangwha Lee

Keyword(s):

Visible Light ◽

Solvothermal Synthesis ◽

Photocatalytic Performance ◽

Core Shell

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Study the effect of concentration ratio (magnetic abrasive powder and castor oil) in magnetic abrasive finishing process

Materials Today Proceedings ◽

10.1016/j.matpr.2020.10.160 ◽

2020 ◽

Author(s):

Raman Kumar

Keyword(s):

Castor Oil ◽

Concentration Ratio ◽

Magnetic Abrasive Finishing ◽

Abrasive Powder ◽

Finishing Process ◽

Abrasive Finishing

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In-situ Electrochemical Synthesis of Core-shell Structural NbC@Nb5Si3/Nb Composites in Molten Salt

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/714/3/032008 ◽

2021 ◽

Vol 714 (3) ◽

pp. 032008

Author(s):

Hongmei Li ◽

Zhisheng Nong ◽

Qian Xu ◽

Qiushi Song ◽

Ying Chen ◽

...

Keyword(s):

Molten Salt ◽

Electrochemical Synthesis ◽

Core Shell

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Development of a New Finishing Process Combining a Fixed Abrasive Polishing with Magnetic Abrasive Finishing Process

Machines ◽

10.3390/machines9040081 ◽

2021 ◽

Vol 9 (4) ◽

pp. 81

Author(s):

Yanhua Zou ◽

Ryunosuke Satou ◽

Ozora Yamazaki ◽

Huijun Xie

Keyword(s):

Alumina Ceramic ◽

Ceramic Plate ◽

Polishing Process ◽

High Quality ◽

Influence Of Process Parameters ◽

Magnetic Abrasive Finishing ◽

Nano Scale ◽

Finishing Process ◽

Abrasive Finishing ◽

Fixed Abrasive

High quality, highly efficient finishing processes are required for finishing difficult-to-machine materials. Magnetic abrasive finishing (MAF) process is a finishing method that can obtain a high accuracy surface using fine magnetic particles and abrasive particles, but has poor finishing efficiency. On the contrary, fixed abrasive polishing (FAP) is a polishing process can obtain high material removal efficiency but often cannot provide a high-quality surface at the nano-scale. Therefore, this work proposes a new finishing process, which combines the magnetic abrasive finishing process and the fixed abrasive polishing process (MAF-FAP). To verify the proposed methodology, a finishing device was developed and finishing experiments on alumina ceramic plates were performed. Furthermore, the mechanism of the MAF-FAP process was investigated. In addition, the influence of process parameters on finishing characteristics is discussed. According to the experimental results, this process can achieve high-efficiency finishing of brittle hard materials (alumina ceramics) and can obtain nano-scale surfaces. The surface roughness of the alumina ceramic plate is improved from 202.11 nm Ra to 3.67 nm Ra within 30 min.

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Morphology Controlled Synthesis of γ-Al2O3 Nano-Crystallites in Al@Al2O3 Core–Shell Micro-Architectures by Interfacial Hydrothermal Reactions of Al Metal Substrates

Nanomaterials ◽

10.3390/nano11020310 ◽

2021 ◽

Vol 11 (2) ◽

pp. 310

Author(s):

Dohyeon Han ◽

Doohwan Lee

Keyword(s):

Electrostatic Interactions ◽

Heterogeneous Catalysts ◽

Metal Substrate ◽

Inorganic Anions ◽

Core Shell ◽

Hydroxyl Groups ◽

Hydrothermal Reactions ◽

Fine Control ◽

Reaction Processes

Fine control of morphology and exposed crystal facets of porous γ-Al2O3 is of significant importance in many application areas such as functional nanomaterials and heterogeneous catalysts. Herein, a morphology controlled in situ synthesis of Al@Al2O3 core–shell architecture consisting of an Al metal core and a porous γ-Al2O3 shell is explored based on interfacial hydrothermal reactions of an Al metal substrate in aqueous solutions of inorganic anions. It was found that the morphology and structure of boehmite (γ-AlOOH) nano-crystallites grown at the Al-metal/solution interface exhibit significant dependence on temperature, type of inorganic anions (Cl−, NO3−, and SO42−), and acid–base environment of the synthesis solution. Different extents of the electrostatic interactions between the protonated hydroxyl groups on (010) and (001) facets of γ-AlOOH and the inorganic anions (Cl−, NO3−, SO42−) appear to result in the preferential growth of γ-AlOOH toward specific crystallographic directions due to the selective capping of the facets by adsorption of the anions. It is hypothesized that the unique Al@Al2O3 core–shell architecture with controlled morphology and exposed crystal-facets of the γ-Al2O3 shell can provide significant intrinsic catalytic properties with enhanced heat and mass transport to heterogeneous catalysts for applications in many thermochemical reaction processes. The direct fabrication of γ-Al2O3 nano-crystallites from Al metal substrate with in-situ modulation of their morphologies and structures into 1D, 2D, and 3D nano-architectures explored in this work is unique and can offer significant opportunities over the conventional methods.

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