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T.M. Shao
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Proceedings Papers
ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 1043-1048, May 25–29, 1998,
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Polymer injection is an effective technique for increasing oil production in the later stage of petroleum exploitation. The pumps used typically incorporate ceramic plungers because they do not produce metal ions which tend to decrease polymer viscosity. This paper compares the performance of plasma sprayed and sintered alumina plungers and includes the results of stress analysis using finite elements and field testing. Under real working conditions, plasma sprayed plungers achieved an average lifetime of 12,000 hours, approximately double that of their sintered ceramic counterparts.
Proceedings Papers
ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 641-646, May 25–29, 1998,
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Impact performance of plasma spray coatings is usually evaluated by means of surface observation after impact action. As a matter of fact, the dynamic response characteristics of coatings in the course of impact action are also very important. In this paper, a method of response frequency spectrum analysis is developed for the impact evaluation of plasma spray coatings. An impact test machine, in which the impact load is generated by a pivot-rod-lever system, is specially designed, allowing both single impact test and repeated impact test. The frequency spectra of Cr2O3 ceramic coating and WC-Co17% alloy coating under single and repeated impact action are analyzed. The results show that there is an obvious relationship between the impact performance and the impact response frequency spectrum. Abrupt changes in the coating, such as appearance of surface cracks and surface damage, correspond the sudden changes of the response frequency spectrum.