Abstract
The high-temperature oxidation behaviour of Si-bearing cobalt-base superalloys has been investigated. Isothermal oxidation tests conducted at 900, 1000, and 1150 °C indicated that silicon addition can improve oxidation resistance. Furthermore, the alloy content of tungsten can have profound impact on the oxidation behaviour; low content of tungsten can promote the formation of protective alumina at temperatures at and above 1000 °C, while high tungsten content can slow down oxidation at 900 °C.
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