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R.J. Dumola
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Proceedings Papers
ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 1495-1500, May 25–29, 1998,
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The UTSC '97 saw the release of a new wave of HVOF related technologies with the promise of high quality coatings allied to lower costs and simpler operation. This trend was seen by some experts as signifying the future of HVOF development. The emphasis was on increasing the cost effectiveness/competitiveness of HVOF coatings and making the technology more attractive to the general coatings market. One route was to use microchip technologies to control the process therefore reducing operation involvement in addition to reducing parts and system cost. Further features included using higher oxygen inlet chamber pressures for higher quality and higher deposition rates. The more compact and portable designs also allow HVOF to expand into field applications and a lower capital cost enabled non-specialists to adopt HVOF. This paper summarises the significant features of this technology wave in the light of practical operational experience and applications. One key to the success of the technology has been its correct matching to the coating type and application. Total coating cost analysis is performed to highlight its economic benefits and there is a comparison with other established forms of coating such as chrome plating, plasma and combustion spraying. This includes a description of the coating quality and wear performance.
Proceedings Papers
ITSC1997, Thermal Spray 1997: Proceedings from the United Thermal Spray Conference, 427-434, September 15–18, 1997,
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The plasma transferred arc process continues to be the coating method of choice for the application of cobalt base alloys onto valve and valve trim. Although new applications have been developed over the years, the process remains largely associated with the application of high performance, highly alloyed powders for relatively small parts or small areas of large parts. The use of the plasma transferred arc process for large volume application has been limited by the robustness and performance characteristics of the equipment and the use of cobalt. A new plasma transferred arc system (power source, torch and process controller) has been developed which allows the application of powder metal alloys at deposition rates of up to 40 pounds per hour. In addition, there has been a development of new non-cobalt powder alloys with excellent mixed corrosion and wear resistance properties. These capabilities have rendered the process technically and economically viable for large and demanding applications in the mining, power utility and steel industries. The new PTA system and the recent developments in powder alloys will be discussed. Reference will be made to specific applications in target industries.