High-temperature oxidation behavior of CeO2-SiO2/Ni-W-P composites
(1. Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology,
Kunming 650093, China;
2. Research Center for Analysis and Measurement, Kunming University of Science and Technology,
Kunming 650093, China)
Kunming 650093, China;
2. Research Center for Analysis and Measurement, Kunming University of Science and Technology,
Kunming 650093, China)
Abstract: Ni-W-P matrix composites containing CeO2 and SiO2 nano-particles were prepared on common carbon steel surface by means of pulse electrodeposition, and the high-temperature oxidation behavior was investigated. The results show that when the oxidation time is controlled in 1 h, oxidation kinetics curve between oxidation mass gain rate and oxidation temperature of CeO2-SiO2/Ni-W-P composites accords with the index increasing law. When the oxidation temperature is controlled at 300 ℃, the kinetics curve between oxidation mass gain rate and oxidation time accords with the linear increasing law. The composites as-deposited are in the amorphous state and turn into the crystal state at 400 ℃. The microstructures of oxidation film on the composites will change from the compact state to the loose state with increasing oxidation temperature to 800 ℃. They are still continuous and compact, and there are no crackle, strip and falling-out. CeO2 and SiO2 nano-particles co-deposited into Ni-W-P alloy can improve the high-temperature oxidation resistance.
Key words: pulse electrodeposition; metal matrix composites; nano-particles; high-temperature oxidation behavior