Morphology and composition of nickel–boron nanolayer coating on boron carbide particles

This work is focused on electroless coating of Ni–B nanolayer on B 4 C particle surfaces. The B 4 C particles used are approximately 2 μm in average size. Effects of activation agent PdCl 2 , complexing agent C 2 H 8 N 2 , and reducing agent NaBH 4 addition rate are studied. The solids loading of B...

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Bibliographic Details
Published in:Journal of materials science 2008-06, Vol.43 (12), p.4247-4256
Main Authors: Dong, Hongying, Zhu, Xiaojing, Lu, Kathy
Format: Article
Language:English
Subjects:
Boron carbide
Characterization and Evaluation of Materials
Chemistry
Classical Mechanics
Colloidal state and disperse state
Crystallography and Scattering Methods
Electroless coating
Exact sciences and technology
General and physical chemistry
Materials Science
Morphology
Nickel
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Polymer Sciences
Reagents
Reducing agents
Scanning electron microscopy
Solid Mechanics
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Summary:This work is focused on electroless coating of Ni–B nanolayer on B 4 C particle surfaces. The B 4 C particles used are approximately 2 μm in average size. Effects of activation agent PdCl 2 , complexing agent C 2 H 8 N 2 , and reducing agent NaBH 4 addition rate are studied. The solids loading of B 4 C is 0.625 g/L and the concentration of Ni 2+ ions is 0.004 mol/L in the electroless coating solution. Scanning electron microscopy (SEM) shows that when B 4 C:Pd 2+ molar ratio is 1:0.005, a Ni–B nanolayer with the smallest Ni–B nodule size covers the B 4 C particle surfaces. Complexing agent C 2 H 8 N 2 decreases Ni 2+ ion release rate. Ni:C 2 H 8 N 2 ratio of 1:6 is the preferred complexing agent amount for achieving a continuous Ni–B nanolayer. The Ni–B nanolayer formation is also strongly dependent on the rate that Ni 2+ ions are reduced. Slow Ni 2+ reduction leads to increased Ni content in the Ni–B nanolayer. When the above three factors are combined at the optimal values for the electroless coating process, well-defined Ni–B nanolayer is obtained. SEM cross section analysis shows the Ni–B nanolayer completely covers the B 4 C particles with less than 55 nm thickness.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-008-2615-0