Abstract
The oxidation kinetics of cobalt based alloys with 10 and 15 vol.-% additions of SiAlON were studied at 1000°C in 1 atm of oxygen for 50 h. The Co-Cr-SiAlON alloys studied for oxidation resistance were sintered at 1100°C where the SiAlON particles remained stable. Additional sintering studies carried out at higher temperatures revealed extensive solid state reaction of SiAlON dispersions. Stable SiAlON dispersions in Co-12% Cr-10 vol.% SiAlON and Co-10% Cr-15 vol.-% SiAlON alloys formed alternate external oxide areas of SiO 2 and Cr 2O 3 with internal Cr 2O 3 forming around SiAlON particles within the matrix. SiO 2 exhibited a pronounced tendency to grow upward rather than laterally within the external oxide scale. The remaining Co-Cr-SiAlON alloys studied formed outer CoO layers with an inner layer of Cr 2O 3 and precipitated SiO 2 internally. SiAlON additions proved to be more beneficial in reducing the oxidation kinetics than an equivalent amount of elemental silicon in a Co-Cr alloy.
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