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The PV limit for the combination was 31,000 in
the unlubricated condition and 360,000 PV for
the lubricated condition. The dry friction coefficient was .29 and
the lubricated value was .02.
The maximum temperature was 420ºF for the unlubricated condition
and 213ºF for the lubricated
condition.
There was slight damage to the bearing and
shaft in the unlubricated condition and little to no
damage in the lubricated condition.
Table II shows the results of the thrust
washer wear tests. The friction coefficient in the
unlubricated condition was .13 and in the lubricated condition was
.08. The maximum
temperature was 475ºF for the unlubricated condition and 313ºF for
the lubrication test.
The wear rate for the unlubricated condition
was 3.2 mg/hr and less than < 0.1 mg/hr for the
lubricated test. Slight damage was noted on the unlubricated sample
surface and very little
damage was obvious on the lubricated sample.
Conclusions
The overall results for the Metalife coated
samples show a considerable increase in PV limit
when compared to previous tests run on uncoated samples. Similar
comparisons to uncoated
wear tests indicate that the wear rate was reduced significantly
when coated with the metalife
system.
If you have any questions, please do not
hesitate to call me.
Sincerely,
Salvadore J. Calabrese
Research Specialist |
