발간논문

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Vol.32, No.5, 545 ~ 552, 1994
Title
Oxidation of W - Mo - Cr - Al Alloy at 1000 , 1100 and 1200℃
윤국한Kook Han Yoon, 최주Ju Choi
Abstract
Isothermal and cyclic oxidation behavior of W-Mo-Cr alloys with and without Al addition(5 weight %) has been studied in air at 1000, 1100 and 1200℃. During isothermal oxidation, the rapid weight loss of W-30Mo-35Cr alloy after 10hrs at 1200℃ was considered to be due to the evaporation of W and Mo oxides through the porous oxide layers. W-24Mo-36Cr-5Al alloy formed the internal oxidation zone of Al₂O₃ particles and the outer protective Cr₂O₃ layer and thus revealed good oxidation resistance, During cyclic oxidation, W-24Mo-36Cr-5Al alloy showed better oxidation resistance than W-30Mo-35Cr alloy. W-30Mo-35Cr alloy showed a significant spallation after 30 cycles while W-24Mo-36Cr-5Al alloy revealed Cr₂O₃ layer still remaining as a protective layer after 100 cycles at 1100℃. It is suggested that the Al internal oxidation zone formed by addition of Al performs an important role in formation and stabilization of the outer protective Cr₂O₃ layer.
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