标题：High-temperature oxidation behavior of Nb67-xW15Si18Hfx(x=0, 5 and 10) alloys
作者：Jiang Rong-li; Liu Dong-ming; Sha Jiang-bo; Ma Yue
作者机构：School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;School of
会议名称：Beijing International Materials Week
会议日期：JUN 25-30, 2006
关键词：Nb-Si based alloys;Ni67-xW15Si18Hfx alloys;high-temperature oxidation;oxidation resistance;oxide
摘要：The oxidation behaviors of Nb67-xW15Si18Hfx (x=0, 5, 10) alloys were studied at 1 250 ℃ in air. It is found that the Nb67W15Si18 alloy has the best oxidation resistance among the three alloys; and Hf addition is harmful to the oxidation resistance of the Nb67W15Si18 alloy. The oxides formed on the Nb67W15Si18 alloy are mainly Nb12WO33 and NbO2, and that on the Nb62W15Si18Hf5 and Nb57W15Si18Hf10 alloys is Nb2O5. Effect of Hf on the oxidation behavior of the Nb67-xW15Si18Hfx alloys has been discussed based on microstructures and kinetics of oxidation.