Influence of head-tip morphology on contact properties for microconnector of Ni–Co alloy
To examine experimentally the influence of head-tip morphology on electrical and mechanical properties at the contact with a phosphor bronze, cantilevertype microconnectors of Ni–Co alloys were prepared by an electroplating technique. Here, the mol fraction y of Co in the Ni–Co alloy is 0.178,...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Springer New York
2013
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/31683/ http://irep.iium.edu.my/31683/ http://irep.iium.edu.my/31683/ http://irep.iium.edu.my/31683/1/influence.pdf |
| Summary: | To examine experimentally the influence of
head-tip morphology on electrical and mechanical properties
at the contact with a phosphor bronze, cantilevertype
microconnectors of Ni–Co alloys were prepared by an
electroplating technique. Here, the mol fraction y of Co in
the Ni–Co alloy is 0.178, 0.204, 0.233 and 0.299. Among
these alloys, the Vickers hardness is HV = 510, 518, 525
and 478 for y = 0.178, 0.204, 0.233 and 0.299, respectively.
Since the Vickers hardness is the maximum for
y = 0.233, the Ni–0.233Co alloy may indicate the best
wear-resistance. The loading and unloading manipulations
were repeated to measure electrical resistance at the
mechanical contact between the Ni–0.233Co microconnector
and the phosphor bronze up to 103 times. The
repetitive measurement was conducted for microconnectors
with thickness of 45 lm and head-tip curvature radii of
r = 5, 25, 50 and 200 lm. Even at the initial repetition, the
reliable electrical contact is actualized for r = 5 lm but
not for r = 25–200 lm. The experimental result was
quantitatively analyzed using a mechanical model. The
analysis provides that the impression depth z of the headtip
into the phosphor bronze at the contact is mostly |
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