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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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Published in: | Journal of materials science 2008-06, Vol.43 (12), p.4247-4256 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 0022-2461 1573-4803 |
DOI: | 10.1007/s10853-008-2615-0 |