Minimizing the Cobalt Content in Wear Resistant Sintered Materials
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Cobalt-based materials have been used in the industry for many years, offering proven wear resistance and corrosion resistance. But cobalt's pricing has become volatile in recent years and has led to an increasing need to find high quality substitutes. Targeting high-temperature tribological applications like exhaust gas recirculation valves and turbochargers, Tenneco's Powertrain division (formerly Federal-Mogul Powertrain) is developing sintered iron-based self-lubricating materials with the aim of reducing the use of cobalt.
Problem Definition and Motivation
In most tribological systems temperature is an important parameter. In low temperature range applications with fluid lubrication an external lubricant protects against contact wear, while in dry sliding friction arrangements the materials being used have to provide a certain level of wear resistance themselves. In many applications dry sliding arrangements can often be found when engineers are trying to keep the technical...