Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637175
Title: Improvements in zinc galvanising pot bearings
Author: Griffiths, H. R.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2003
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Abstract:
A study has been carried out of the performance of a series of candidate bearings in a molten zinc alloy. The object was to identify those that may be capable of increasing the lifetime of the submerged galvanising bath bearings. The programme involved the development of a test rig which was able to assess the performance of the bearings under controlled conditions similar to those encountered in service. The reproducibility of the results generated by the test rig was established prior to the undertaking of the candidate bearing tests. The candidate bearing tests were carried out in a molten zinc alloy representative of that used in commercial operations. Dross particles were present in the molten zinc alloy as a result of the chemical reaction of the elements present. The candidate bearings were immersed and rotated under load for periods of up to 12 hours. The candidate bearings included a molybdenum-tungsten alloy journal and bushing, a coated bushing paired with a cobalt alloy journal and a cobalt alloy overlay on a stainless steel bushing, which was paired with two different cobalt alloy journals. The reference bearing for each of the tests was a cobalt alloy bushing and journal as used in commercial production. By comparing the results of the reference bearings performance in production to that of the test rig, it was determined that the test rig has an acceleration factor of 12.5 under the standard testing conditions. The application of the hard coating on the bushing, paired with a cobalt alloy journal, proved effective in reducing the mass and thickness loss when compared with the reference bearing. The cobalt alloy overlay on a stainless steel bushing paired with the two different cobalt alloy journals exhibited large mass and thickness loss per hour results in comparison to the reference bearing. The cobalt alloy bushing paired with the cobalt alloy journal of higher hardness produced very favourable mass and thickness loss results when compared with the reference.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (D.Eng.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.637175  DOI: Not available
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