(北京科技大學(xué) 腐蝕與防護中心， 北京 100083)
摘 要: 采用高頻電脈沖沉積技術(shù)在Ni-20Cr合金表面上沉積MGH754 ODS合金，獲得了Ni20Cr-Y2O3彌散氧化物微晶涂層。在1 000 ℃空氣中對Ni-20Cr合金及施加涂層的試樣進行100 h的氧化實驗。結(jié)果表明，微晶化和添加彌散氧化物(Y2O3)促進了鉻發(fā)生選擇氧化形成Cr2O3氧化膜，提高了合金的抗高溫氧化性能和氧化膜的粘附性。 用AFM,SEM,EDS和XRD分別對Ni-20Cr合金與Ni-20Cr-Y2O3彌散氧化物微晶涂層的形貌、結(jié)構(gòu)和成分進行了研究，討論了彌散氧化物微晶涂層改善Ni-20Cr合金高溫氧化性能的協(xié)同作用機理。
關(guān)鍵字: 高頻電脈沖沉積； 彌散氧化物微晶涂層；高溫氧化
ODS microcrystalline coatings
（Corrosion and Protection Center, University of
Science and Technology Beijing, Beijing 100083, P.R.China）
Abstract:Ni-20Cr-Y2O3 ODS microcrystalline coatings were prepared on the surface of the Ni-20Cr alloy by a high frequency electrospark technique. The coatings have metallurgical bonding with the substrate of alloy. Oxidation in air at 1 000 ℃ for 100 h shows that the selective oxidation of Cr has been promoted to form the Cr2O3 scale by the microcrystalline structure and the oxide dispersions of Y2O3 in the coatings. The oxidation resistance and the adhesion ofoxide scales to the substrate are also improved. The surface morphologies, structure and composition of the Ni-20Cr alloy and the Ni-20Cr-Y2O3 ODS microcrystalline coatings were observed and analyzed by AFM, SEM, EDS and XRD. The synergistic effects of oxide dispersedmicrocrystalline coatings on improving the oxidation resistance of the alloy Ni-20Cr have been discussed.
Key words: highfrequency electrospark deposition；Ni-20Cr-Y2O3 ODS microcrystalline coatings；oxidation
