The behavior of ceramic thermal barrier coatings on diesel engine combustion zone components |
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| Affiliation: | 1. State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi’an, Shaanxi, PR China;2. Taiyuan University of Technology, No. 79 West Yingze Street, Taiyuan, Shanxi, PR China;3. Department of Thermal Power Engineering, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi’an, Shaanxi 710049, PR China;1. Department of Mechanical Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Chennai, Tamil Nadu 600062, India;2. Department of Electronics and Communication Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Chennai, Tamil Nadu 600062, India;1. Department of Ophthalmology, University of Washington School of Medicine;2. Department of Ophthalmology, University College, London, UK;3. Medical Retina Service, Moorfields Eye Hospital, London, UK;4. National Eye Institute, U.S. National Institutes of Health;5. Departments of Biological Structure and Laboratory Medicine and Pathology, University of Washington School of Medicine;6. Roger and Angie Karalis Johnson Retina Center, University of Washington School of Medicine;7. Department of Ophthalmology, George Washington University, Washington, DC;8. Jannsen Pharaceuticals, Raritan, NJ |
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| Abstract: | Partially stabilized zirconia ceramic thermal barrier coatings were plasma sprayed over an MCrAlY (M ≡ metal) bond coat on the valve faces and tulips, piston crowns and cylinder heads of two medium speed diesel engines to a specified total thickness of 0.015 in (0.4 mm). One engine was operated for 500 h on a test stand using a cyclic range of throttle settings that was representative of a locomotive engine's operation using number 2 diesel oil fuel. The other engine was operated in a towboat for 9000 h of service on the Inland Rivers, also using number 2 diesel oil fuel.Coating performance analyses were carried out on several parts after service. Coatings applied to piston crowns and cylinder heads generally performed in an acceptable manner. One type of coating on a valve face performed acceptably without coating loss or degradation. Two other types of coatings on valve faces failed for identifiable reasons. Overall, the durability of the coatings in a diesel engine combustion zone operating environment was promising. |
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