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Lookup NU author(s): Professor Steve Bull
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Glass-filled polymers are known to produce considerable wear on the screws and barrels of injection-moulding machines and several coatings and surface treatments have been used to combat this ranging from chromium plating to high velocity oxy fuel (HVOF) WC/Co. However, quantification of the benefits of such coatings and treatments has proceeded on an ad hoc basis and there is little data available on which to aid selection. In this study, a specially designed wear tester has been used to simulate the conditions of wear which occur in the barrel of an injection-moulding machine in order to assess coatings and surface treatments which are often used in this application as a function of test temperature. The tester concept is similar to that of the ASTM rubber wheel abrasion test except that the rubber wheel is replaced by a grooved steel wheel heated to a fixed temperature (up to 250 °C) by hot air and the sand is replaced by pelletised plastic. The plastic is captured by the wheel and dragged past the sample, which is also heated to the same temperature. The sample is pressed against the plastic coated wheel with a small load and a wear scar is produced at the contact point by a combination of abrasive wear from the glass filler and sliding wear from the plastic. A specially designed feeder system allows the controlled supply of polymer feedstock for operating times of a few hours. In the case of glass-filled nylon, the best surface treatment was a diamond-like carbon coating, but hybrid surface treatments involving the nitrogen ion implantation of nitrided steel also showed excellent wear performance. © 2004 Published by Elsevier B.V.
Author(s): Boey P, Ho W, Bull SJ
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 2nd International Conference on Erosive and Abrasive Wear
Year of Conference: 2003
Publisher: Wear: Elsevier