Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31631
Title: Influence of spike current in different shaped waveforms on the hardness and grain size of nickel electroforms
Authors: Wong, KP
Chan, KC 
Yue, TM 
Keywords: Grain sizes
Hardness
Pulse current electroforming
Shaped waveform
Spike
Issue Date: 2001
Publisher: Elsevier
Source: Journal of materials processing technology, 2001, v. 117, no. 1-2, p. 97-104 How to cite?
Journal: Journal of materials processing technology 
Abstract: This paper studies experimentally and theoretically the effects of a ramp-down spike-shaped waveform on the grain size and the hardness of nickel electroforms in pulse current electroforming. Experimental results show that the quality of the electroforms, in terms of hardness improvement, influenced by the types of waveform is in the order of: ramp-down and triangular, both with spike > rectangular with spike > ramp-down; and triangular, both with relaxation time > rectangular. Compared with the results for the conventional rectangular waveform, the experimental results show that the hardness value can be improved by about 46% when a ramp-down spike and a relaxation time are used in the case of triangular or ramp-down waveform. The finest grain size and the highest hardness value were obtained by using a ramp-down spike in either triangular or ramp-down waveform. These results are supported by theoretical predictions and study of the surface morphology of the electroforms using a scanning electron microscope.
URI: http://hdl.handle.net/10397/31631
ISSN: 0924-0136
EISSN: 1873-4774
DOI: 10.1016/S0924-0136(01)01106-2
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

13
Last Week
0
Last month
0
Citations as of Sep 10, 2017

WEB OF SCIENCETM
Citations

11
Last Week
0
Last month
0
Citations as of Aug 5, 2017

Page view(s)

36
Last Week
0
Last month
Checked on Sep 17, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.