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A kinetic study of nickel deposition on spherical silica particles and viscose fibers by chemical plating
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
Institute of Process Engineering, Chinese Academy of Sciences, Beijing.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-3548-8638
2009 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 40, no 4, 523-532 p.Article in journal (Refereed) Published
Abstract [en]

In the present work, nickel silica composite powder was prepared using an ammonia-ammonium sulfate system. Optical microphotographs showed that the coated nickel layer was dense and complete. Suitable operation conditions were reported. The composite nickel viscose fiber prepared by this plating system was also investigated. The mechanism of nickel coating on spherical silica particles and viscose fibers by hydrazine reduction was studied. It was found that tiny Pd spots on the surface of particles or fibers acted as active centers for nickel deposition at the initial stage of the process. Thereafter, Ni itself would act as an active center for catching Ni from the solution through the reaction Ni2+ + 2H (ad) (*) -> Ni + 2H(+). The rate of the process was found to be controlled by the reaction at the interface, under the present experimental conditions. Kinetic models were proposed on the basis of the experimental results. The model predictions were found to be in agreement with the experimental data.

Place, publisher, year, edition, pages
2009. Vol. 40, no 4, 523-532 p.
Keyword [en]
Active center; Ammonium Sulfate; Chemical plating; Experimental conditions; Experimental data; Hydrazine reduction; Initial stages; Kinetic models; Kinetic study; Model prediction; Nickel coating; Nickel deposition; Nickel layers; Operation conditions; Plating systems; Silica composites; Spherical silica particles; Viscose fibers; Ammonium compounds; Fibers; Kinetic theory; Nickel alloys; Palladium; Silica
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-7425DOI: 10.1007/s11663-009-9252-0ISI: 000268496400010Scopus ID: 2-s2.0-68549088743OAI: oai:DiVA.org:kth-7425DiVA: diva2:12449
Note
QC 20100804. Uppdaterad från In press till Published 20100804.Available from: 2007-08-31 Created: 2007-08-31 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Development of Techniques to Produce Nickel Coated Composite Materials as well as Hollow Nickel Fibres and Kinetic Study of the Process Involved
Open this publication in new window or tab >>Development of Techniques to Produce Nickel Coated Composite Materials as well as Hollow Nickel Fibres and Kinetic Study of the Process Involved
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The present thesis was mainly to study the preparation of nickel composite materials by chemical plating process. Nickel coated boron nitride particles, nickel coated spherical silica particles and nickel viscose composite fibres were prepared. Both experiment and model development were carried out to study the kinetics of the processes. Preparation of hollow nickel fibres was also investigated.

NiSO4-(NH4)2SO4-NH3·H2O-N2H4·H2O was found a suitable system for nickel plating. This system could be employed in preparing nickel coating layer on surface of boron nitride particles, spherical silica powder and viscose fibres. The main factors which could affect the plating process were investigated. The optimum conditions were suggested for different substrate materials based on the experimental results.

It was found that Pd on the surface of substrate materials acted as an active center for nickel deposition at the initial stage of the process. Thereafter, Ni itself would act as an active center to catch Ni from the solution through the reaction: Ni2+ + 2H* ad ⇒ Ni + 2H+. The rate of the process was found to be controlled by the reaction at the interface under the present experimental conditions. A kinetic model was developed on the basis of the mechanism study. The model predictions were found to be in agreement with the experimental data for different substrate materials. Since the kinetic model does not have any parameters related to the shape and surface area of the substrate, it could be used as a general model to describe the processes controlled by interface reaction with growing interface area.

Hollow nickel fibers were prepared by thermal decomposition method from nickel viscose composite. The experiments showed that viscose filling could be removed by heat treatment in air atmosphere. Experiments showed that hollow nickel fiber could be prepared by direct thermal decomposition in air flow at low temperature, e.g. 573 K. But slight surface oxide is inevitable. Decomposition of the viscose filling could also be carried at higher temperature. However, serious oxidation of nickel would also take place during the decomposition. To remove nickel oxide, reduction by hydrogen gas could be applied.

Preliminary effort was made to extend the application of the present method to prepare copper viscose composite fibres. Promising result was obtained. More detailed study is required to confirm the applicability of the technique.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. viii, 47 p.
Series
Theses in philosophy from the Royal Institute of Technology, ISSN 1650-8831 ; 2007:51
Keyword
Nickel, Chemical plating, Kinetics, Model, Hollow nickel fibres, Thermal decomposition
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-4478 (URN)978-91-7178-736-1 (ISBN)
Public defence
2007-09-21, Salongen, KTHB, Osquars Backe 31, KTH, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100804Available from: 2007-08-31 Created: 2007-08-31 Last updated: 2010-08-04Bibliographically approved

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