ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
Actual requirements in the automotive industry are the reduction of fuel consumptionand pollution emission, engine efficiency improvement, as well as cost reduction. Most of theserequirements are fulfilled by reducing the total weight of the vehicle. This results in an increasingutilization of light metal components for engine applications. Significant weight savings areobtained by changing the engine block material from cast iron to aluminum or even to magnesiumaluminum hybrid constructions.Despite of all advantages the industrial implementation of light metals is often inhibited by theirpoor surface properties especially concerning wear and tribological behavior. Due to the highlyloaded operation conditions a cylinder liner surface reinforcement is necessary.A very promising technological alternative is the internal cylinder reinforcement by using HVOF(high velocity oxygen fuel) sprayed coatings. By using these advanced high energetic coatingtechnologies, material combinations containing solid lubricant ceramic dispersions can bedeposited. The thermal spray processes represent a cost effective and flexible solution for ultra lightweight engine technology. This research is focused on the development of HVOF sprayed coatingsystems for cylinder liners, the coating optimization and the cost effective implementation of thishypersonic spray technology in a series production process.It will be shown that cast engine block bores can be directly coated by using an automatedHVOF process, obtaining improved coating results. The internal coating process by hypersonicflame spraying is a superior technological alternative to the APS process for high quality cylinderliner and engine crankcase applications
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.1330.pdf
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